tag:blogger.com,1999:blog-11209876470492977372024-03-13T11:03:00.802+03:00electronics repair made easyWe offer quality products, services, training and information with emphasis to electronics and communication field through relevant information.Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.comBlogger338125tag:blogger.com,1999:blog-1120987647049297737.post-19615321310976823102024-02-04T16:58:00.001+03:002024-02-04T16:58:17.444+03:00Cool steamer producer is repaired<p><span style="font-family: verdana;"> </span><span style="font-family: verdana;">I received this machine on my bench,</span><span style="font-family: verdana;">With
commercial name of</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">EMSIG made in china.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3u_xzAMWUl_yqwj4O-V9YiIaTf5Co4qqcske9wTv90yZhBnRdlJE_z72P8zsCFRWcISsTXFe6qFkKDWUEim6WBQ4REbVDjiz1v5DOyuzxazVnyp0riVgO66ybXOcmf_BuE83AvLcdItAOLxmu4M6KIkTFisUqZSfGw_d2-tLPQ_qBrUpx3UygDMZmZ_F8/s499/b1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="499" data-original-width="449" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3u_xzAMWUl_yqwj4O-V9YiIaTf5Co4qqcske9wTv90yZhBnRdlJE_z72P8zsCFRWcISsTXFe6qFkKDWUEim6WBQ4REbVDjiz1v5DOyuzxazVnyp0riVgO66ybXOcmf_BuE83AvLcdItAOLxmu4M6KIkTFisUqZSfGw_d2-tLPQ_qBrUpx3UygDMZmZ_F8/w576-h640/b1.jpg" width="576" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><br /></div><p></p><p class="MsoNormal"><span style="font-family: verdana;"><span></span></span></p><a name='more'></a>like most of<span style="font-family: verdana;"> </span><span style="font-family: verdana;">these kind of machine does not producing cool
steam the red led on the fac</span><span style="font-family: verdana;">e machine</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">is
on this means that the power is coming inside but something or things does not
let machine to produce the steam the machine</span><span style="font-family: verdana;">
</span><span style="font-family: verdana;">consist of</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">two pcb board one as
psu smps </span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">another one is the oscillation
board that generates the frequencies around 890k hertz </span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">TRANSISTOR BU 406 is agent that by help of cap
and a coil</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">make oscillation frequencies
and signal frequencies directly goes to the membrane of piezo electric and start
to vibrate in this frequencies the water break in small pieces and by help of a
fan blow the pieces of water to the up and outside of machine</span><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiH_-ITSK4lxiDfi87gyEcXSd4ryy-J0hyOdIouPHwv0wAo2KE_xX_9WLco-zmMMdttnd1sLvE2IXkUlSDIb7fvFuLd87BmPV6soFkKrkxvB-zyBaHaiAEhn734cTeksqJ9DMLr8vWXDLR7ARQRdCiWNtcLuAqyOGP66tB4cfWpgNJBRHhlq3NosFI_TLMT/s830/b2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="502" data-original-width="830" height="388" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiH_-ITSK4lxiDfi87gyEcXSd4ryy-J0hyOdIouPHwv0wAo2KE_xX_9WLco-zmMMdttnd1sLvE2IXkUlSDIb7fvFuLd87BmPV6soFkKrkxvB-zyBaHaiAEhn734cTeksqJ9DMLr8vWXDLR7ARQRdCiWNtcLuAqyOGP66tB4cfWpgNJBRHhlq3NosFI_TLMT/w640-h388/b2.jpg" width="640" /></a></div><p class="MsoNormal"><!--[endif]--><!--[if gte vml 1]><v:shape
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piezo Atomizer work?<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana;">Piezo
atomizers work by applying an alternating electrical current to a piezoelectric
transducer which causes it to vibrate ultrasonic frequencies this vibration is
then transferred to a liquid which breaks up into a fine mist of droplets. the
size of droplets can be controlled by the holes sizes on mesh and by adjusting
the frequency and amplitude of the vibration<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 107%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw9Qm3U6zwoDGrnXerUEpb2ekZ5XaVE98AY11rMxZnFXNV1qpiCVYk9JngYbMA9qY19KZZQYx2u1fJeYTcHVelODZOxQTmH0Q0pyuQzDXvAp614WSWgEsmDtyDBJvLmzEtsIf_oBVchyphenhyphenugLzsjvbaOXx6LZof_PC1k9DkKRgd_fwpBVedGLXwsB5an0uSC/s492/b3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="321" data-original-width="492" height="418" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw9Qm3U6zwoDGrnXerUEpb2ekZ5XaVE98AY11rMxZnFXNV1qpiCVYk9JngYbMA9qY19KZZQYx2u1fJeYTcHVelODZOxQTmH0Q0pyuQzDXvAp614WSWgEsmDtyDBJvLmzEtsIf_oBVchyphenhyphenugLzsjvbaOXx6LZof_PC1k9DkKRgd_fwpBVedGLXwsB5an0uSC/w640-h418/b3.jpg" width="640" /></a></div><br /><p></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana;">After
opening the machine faced with too much </span></span><span style="font-family: verdana;">Dirt caused
by sediment of water. the user said never used lite water for this machine and
this much of sediment was just cos of use of heavy water. Psu of this machine produce
to kind of voltages one 32 volt Dc just for oscillator board and12 volts for
fan of machine both where good and within tolerances so far so good then I
disconnect the wires that attached to piezo then by help of frequency meter of
vtom i measured the frequencies that going to piezo my meter read about 896 kilo
hertz then something must wrong it inside the piezo.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcAgwvapWim3TVuce28U2ckrx_pEg0j2gwCT8FkXNSQaDj5UousoQBSj9T4ZMCW_Jb82qHIEmXmG-V8nSTOct9GOB-KK6eJHoSjBX_9UyBQ2MAr7dmY6NxV8eyJ54psEuz1di2VAvXpwFg9rcFCNjJi-azhUpd9FtiQWHZLUsWUnFzgGg-iAOTce5BmFwf/s772/b4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="459" data-original-width="772" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcAgwvapWim3TVuce28U2ckrx_pEg0j2gwCT8FkXNSQaDj5UousoQBSj9T4ZMCW_Jb82qHIEmXmG-V8nSTOct9GOB-KK6eJHoSjBX_9UyBQ2MAr7dmY6NxV8eyJ54psEuz1di2VAvXpwFg9rcFCNjJi-azhUpd9FtiQWHZLUsWUnFzgGg-iAOTce5BmFwf/w400-h238/b4.jpg" width="400" /></a></div><br /><p class="MsoNormal"><span style="height: 107px; margin-left: 662px; margin-top: 977px; mso-ignore: vglayout; position: absolute; width: 163px; z-index: 251669504;"><br /></span><!--[endif]--><!--[if gte vml 1]><v:shape
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</v:shape><![endif]--><!--[if !vml]--><span style="height: 64px; margin-left: 275px; margin-top: 944px; mso-ignore: vglayout; position: absolute; width: 384px; z-index: 251668480;"><br /></span><!--[endif]--></p><p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana;">I opened the
metal cap of piezo what you guess yes,</span></span><span style="font-family: verdana;">The red wire from the body of piezo
was disconnected the previous </span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">repairer
on this machine tried to resoldred the red wire to the body of piezo but the
soldering was incomplete and was broken eventually</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">the best thing to do was to replace the piezo
with same size </span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">I and cleaned all the
inside of machine</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">with lite HCL</span><span style="font-family: verdana;"> </span><span style="font-family: verdana;">with a tooth brash this job.</span></p><p class="MsoNormal"><span style="line-height: 107%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZ6qzzHKpQwCir_IqX_I1O2QRYDxGrcf34JEnEr4kHXuFN-3EZMBNRa_03-lhPVHV8hqHXKTX8rAxCYO9qi6mSIQAzQO29xAfRAL77x6tTxhjjFPj16xvupJnBfvbw9I7YFrC-i644XTo2MCrlAhF2wiIOeyy8mz8FOYvuXZX24TC-9lbl4qKvhlfvdnNd/s610/b5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="466" data-original-width="610" height="488" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZ6qzzHKpQwCir_IqX_I1O2QRYDxGrcf34JEnEr4kHXuFN-3EZMBNRa_03-lhPVHV8hqHXKTX8rAxCYO9qi6mSIQAzQO29xAfRAL77x6tTxhjjFPj16xvupJnBfvbw9I7YFrC-i644XTo2MCrlAhF2wiIOeyy8mz8FOYvuXZX24TC-9lbl4qKvhlfvdnNd/w640-h488/b5.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: verdana;">Old lady was
satisfy from this job since she has problem when breathing the dry air.</span></p><p class="MsoNormal"><span style="font-family: verdana;">This article was brought to you by Mr Beh.</span></p><p class="MsoNormal"><span style="font-family: verdana;">Location:Tehran</span></p><p class="MsoNormal"><span style="font-family: verdana;">Country:Iran</span></p><p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-42053739561669626682023-11-14T22:00:00.000+03:002023-11-14T22:00:18.417+03:00Why electronic protector talking long to activate protection mode.<p><span style="font-family: verdana; font-size: medium;"> </span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjl6AackZA3-KLOv9RrDHz9RvQXkSm6wIo3EF78I8OpsFxpf8VyZtKKZIAXV49xYQ24iKNwBP-RqDl4tgn8yXL5NLfulb6JZc5zZVhLWhw3Gos5KymZbeL73hOSyPZpg69D2pkx8bc3RRqy_XuNcu0Znsi82Ug7zfAGhfn4MUW4mIS91vcsVrp7rDQkereD/s597/b1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: medium;"><img border="0" data-original-height="531" data-original-width="597" height="356" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjl6AackZA3-KLOv9RrDHz9RvQXkSm6wIo3EF78I8OpsFxpf8VyZtKKZIAXV49xYQ24iKNwBP-RqDl4tgn8yXL5NLfulb6JZc5zZVhLWhw3Gos5KymZbeL73hOSyPZpg69D2pkx8bc3RRqy_XuNcu0Znsi82Ug7zfAGhfn4MUW4mIS91vcsVrp7rDQkereD/w400-h356/b1.jpg" width="400" /></span></a></div><div class="separator" style="clear: both; text-align: center;"><p class="MsoNormal" style="text-align: left;"><span style="font-family: verdana; font-size: medium;">The problem of this AC line surge protector was not starting
to give protected AC before 6 minute, something
must be wrong inside the machine since
there was no diagram for this circuit as
general services first I re-solder all the joints then the most problematics part are e -capacitors I had
three on the board.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: left;"><span style="font-family: verdana; font-size: medium;">10 microfarad @50 volts <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: left;"><span style="font-family: verdana; font-size: medium;">220 microfarad@25 volts<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: left;"><span style="font-family: verdana; font-size: medium;">22 microfarad @ 16 volts <o:p></o:p></span></p>
<p class="MsoNormal" style="text-align: left;"><span style="font-family: verdana; font-size: medium;">The value of 220 microfarad cap was changed to 200 micro
and ESR 148 ohm that was not good two
others were not bad enough by replacing
the cap machine start to give voltages
after 2 minute<o:p></o:p></span></p></div><p class="MsoNormal" style="border: none; line-height: 109%; margin-bottom: .0001pt; margin-bottom: 0cm; margin-left: .7pt; margin-right: 45.25pt; margin-top: 10.65pt; mso-border-shadow: yes; mso-padding-alt: 31.0pt 31.0pt 31.0pt 31.0pt; mso-pagination: none; text-indent: -.7pt;"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjI0PNv5I4VnjexDBCoCNvc3MfxnFnIISeW4jDKgkOIQbeb6ITfcDIV-y32vsC5GqulR3d7tkrItC4jeRlLgLQGesAMNakfEWybDLQ6CkAGD4q2OVy8zNdRyovzCf1PeknZREa9MbX5uMUz05jkXpBt2_rBvuyKw8Zt9zpnOwQ15USVU2sgPk9K2a9B5vgl/s688/b2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: medium;"><img border="0" data-original-height="383" data-original-width="688" height="223" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjI0PNv5I4VnjexDBCoCNvc3MfxnFnIISeW4jDKgkOIQbeb6ITfcDIV-y32vsC5GqulR3d7tkrItC4jeRlLgLQGesAMNakfEWybDLQ6CkAGD4q2OVy8zNdRyovzCf1PeknZREa9MbX5uMUz05jkXpBt2_rBvuyKw8Zt9zpnOwQ15USVU2sgPk9K2a9B5vgl/w400-h223/b2.jpg" width="400" /></span></a></div><span style="font-family: verdana; font-size: medium;"><br /><span style="color: black; line-height: 109%;">Article brought to you by Mr.Beh. based in Tehran City-Iran.</span><span style="color: white; text-align: right;">OP AMP DBL 324</span></span><p></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-73572673041870113242023-09-20T14:25:00.002+03:002023-09-20T15:01:13.179+03:00Ramtons Microwave oven model RM/320 with “no heating symptoms” now repaired,<p><span style="font-family: verdana; font-size: large;">I received a microwave from a customer who wanted it
checked by a technician,</span></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana; font-size: large;">The complaints were the microwave was working well
in terms of setting time and everything but after going through the process, It
could not heat the food.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana; font-size: large;">This problem from my experience it is used caused by
failure in one or more components of the high voltage circuit.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana; font-size: large;">These incudes, magnetron, high voltage capacitor,
high voltage diode, High voltage fuse or high voltage transformer.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><span style="line-height: 107%;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large; margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="465" data-original-width="455" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmqHSQ7hsVOQRJ7ptymM8zJ6nwOHx1pU961PFGORYO0q4Kns0mqI-HO3my6MiOOZn3YUyvtGB8coWLdiv_oHOF8Q2DeRHxTG39_rooSllECmgnvc1l_vlX8EUMDJJbBO_t9m3krPmet0HwM5fOPPFHe2zYjKH_15lFlCrZcSSrMGFVQcDXzAQdN-XMhr4q/w626-h640/hv1.jpg" width="626" /></span></div><p align="center" class="MsoNormal" style="text-align: center;"><span style="text-align: left;"><span style="font-family: verdana; font-size: large;"><span></span></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: large;">After dis-connecting the microwave from the wall
outlet, I begin to test these components one by one.</span><p></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana; font-size: large;">I noted the high voltage diode has a reading on
diode test of my digital meter which it should not in a normal working condition.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 107%;"><span style="font-family: verdana; font-size: large;">I disconnected one leg of the diode and still got a reading,
I removed it out of circuit and still got the same reading as you can see below.<o:p></o:p></span></span></p>
<blockquote style="border: none; margin: 0 0 0 40px; padding: 0px;"><p class="MsoNormal" style="text-align: left;"><span style="line-height: 107%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDnn6iOuF9uVJMiv5G4obDftb-qsvSk2csrAGt3-2O8whHDCNUgAxWn1HdZfcojMfnLPJiR0jUJJvue9abrGLCfSkWeKvcQnPzTeaPhYfI4QBmITu_7nMD1nRrjy2QixkLW5G8O5VvG7vwu_Qaagvk-ao6nLFaSVRtp1o29lUx3ydX1hohdgBh08p77xr_/s422/hv2.jpg" style="font-family: verdana; font-size: x-large; margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="422" data-original-width="313" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDnn6iOuF9uVJMiv5G4obDftb-qsvSk2csrAGt3-2O8whHDCNUgAxWn1HdZfcojMfnLPJiR0jUJJvue9abrGLCfSkWeKvcQnPzTeaPhYfI4QBmITu_7nMD1nRrjy2QixkLW5G8O5VvG7vwu_Qaagvk-ao6nLFaSVRtp1o29lUx3ydX1hohdgBh08p77xr_/w475-h640/hv2.jpg" width="475" /></a></p></blockquote><p align="center" class="MsoNormal" style="text-align: center;"><span style="font-family: verdana; font-size: x-large;">After
replacing the diode, the machine was up and running again, customer was happy,
so was the technician.</span></p>
<p align="center" class="MsoNormal" style="text-align: center;"><span style="line-height: 107%;"><span style="font-family: georgia; font-size: large;"><i>Thank
you, guys<o:p></o:p></i></span></span></p>
<p align="center" class="MsoNormal" style="text-align: center;"><span style="line-height: 107%;"><span style="font-family: georgia; font-size: large;"><i>See
you in the next class<o:p></o:p></i></span></span></p>
<p align="center" class="MsoNormal" style="text-align: center;"><span style="line-height: 107%;"><o:p><span style="font-family: georgia; font-size: large;"><i> </i></span></o:p></span></p>
<p class="MsoNormal"><span style="font-family: georgia; font-size: large;"><i><span style="line-height: 107%;"><o:p><span> </span></o:p></span>Learn how to repair microwave here <a href="https://www.lcd-ledtelevisionrepairguide.com/2021/04/microwave-oven-repair-made-easy.html">here</a>.</i></span></p><p class="MsoNormal"><span style="font-size: large;"><i><span style="font-family: verdana;"><span face=""Arial","sans-serif"" style="line-height: 21.4667px;"> </span><b><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></span><b><span style="line-height: 107%;"><o:p><span style="font-family: verdana;"> </span></o:p></span><span style="font-family: verdana;"> </span></b><span style="font-family: verdana;"> </span></i></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-6443009318118003342023-07-07T22:38:00.001+03:002023-07-07T22:39:26.412+03:00Test and Tag Training: Ensuring Electrical Safety in New Zealand<p><span style="font-family: times; font-size: large;">Electrical safety is of paramount
importance in both workplaces and residential settings. Faulty electrical
appliances and equipment can pose serious risks, including electric shocks,
fires, and even fatalities. To mitigate these hazards, it is crucial to have a
thorough understanding of test and tag procedures. Test and tag training plays
a crucial role in equipping individuals with the necessary knowledge and skills
to carry out these procedures effectively, ensuring electrical safety
compliance and safeguarding lives and property.</span></p>
<p class="MsoNormal"><span lang="EN-IN"><o:p><span style="font-family: times; font-size: large;"> <span></span></span></o:p></span></p><a name='more'></a><b style="font-family: times; font-size: x-large;"><i>Importance of Electrical Safety</i></b><p></p>
<p class="MsoNormal"><span lang="EN-IN"><o:p><span style="font-family: times; font-size: large;"> </span></o:p></span><span style="font-family: times; font-size: x-large;">Electrical safety is a critical aspect of
maintaining a secure working and living environment. Understanding the
potential risks associated with electrical hazards and the legal obligations of
employers and employees in maintaining a safe electrical environment is
essential. Test and tag training programs emphasize the significance of
electrical safety and create awareness about the importance of adherence to
safety regulations.</span></p>
<p class="MsoNormal"><span style="font-size: x-large;"><span style="font-family: times;"><b><i>Understanding Electrical Hazards</i></b></span></span></p><p class="MsoNormal"><span lang="EN-IN" style="font-family: times;"><o:p><span style="font-size: large;"> </span></o:p></span><a href="https://www.metrotest.co.nz/training-courses/" style="font-family: times; font-size: x-large;">Test and tag training</a><span style="font-family: times; font-size: x-large;">
provides participants with a comprehensive understanding of different types of
electrical hazards. These hazards include electric shocks, electrical fires,
and risks associated with faulty insulation and damaged wiring. Trainees learn
to identify potential hazards and understand the steps necessary to eliminate
or mitigate these risks effectively. By recognizing the potential dangers,
individuals become better equipped to create a safer environment and prevent
accidents.</span></p>
<p class="MsoNormal"><span style="font-family: times; font-size: x-large;"><b><i>Electrical Safety Regulations</i></b></span></p>
<p class="MsoNormal"><span style="font-size: x-large;"><span style="font-family: times;">To ensure compliance with electrical safety
standards, trainees undergo training on specific regulations and requirements
set by regulatory bodies. Understanding these regulations is crucial for
individuals responsible for testing and tagging electrical appliances and
equipment. By gaining knowledge of the legal obligations and responsibilities,
participants can perform their tasks in accordance with established standards
and guidelines.</span></span></p>
<p class="MsoNormal"><span style="font-family: times;"><b><i><span lang="EN-IN"><span style="font-size: large;">Testing Procedures and Equipment</span></span><span style="font-size: x-large;"> </span></i></b></span></p>
<p class="MsoNormal"><span lang="EN-IN"><span style="font-family: times; font-size: large;">Test and tag training programs provide
in-depth knowledge of correct testing procedures for electrical appliances and
equipment. Participants learn to utilize specialized testing equipment and
conduct visual inspections, earth continuity tests, insulation resistance
tests, and leakage current tests. Through these procedures, trainees acquire
the skills necessary to assess the safety of electrical appliances effectively.
They also learn to interpret test results and determine the appropriate course
of action based on the findings.<o:p></o:p></span></span></p>
<p class="MsoNormal"><b style="font-family: times; font-size: x-large;"><i>Tagging and Documentation</i></b></p>
<p class="MsoNormal"><span style="font-size: x-large;"><span style="font-family: times;">Proper tagging and documentation are
integral to the test and tag process. Trainees learn how to affix appropriate
tags to electrical appliances after they have been tested. These tags indicate
the date of the test and the next due date for retesting. By maintaining
accurate records of all test and tag activities, individuals can ensure
compliance with regulatory requirements and track the maintenance history of
electrical equipment effectively. This documentation also serves as an
essential reference for future inspections and audits.</span></span></p>
<p class="MsoNormal"><b style="font-family: times; font-size: x-large;"><i>Risk Assessment and Management</i></b></p><p class="MsoNormal"><span style="font-family: times; font-size: x-large;">Comprehensive test and tag training
includes instruction on risk assessment and management. Participants learn to
evaluate potential risks associated with electrical appliances and equipment
and develop strategies to minimize these risks. This includes implementing regular
testing and maintenance schedules, identifying high-risk areas, and conducting
thorough inspections. By proactively managing risks, individuals can create a
safer environment and reduce the likelihood of accidents or incidents.</span></p>
<p class="MsoNormal"><span lang="EN-IN"><o:p><span style="font-family: times; font-size: large;"> </span></o:p></span><b style="font-family: times; font-size: x-large;"><i>Practical Training and Assessment</i></b></p>
<p class="MsoNormal"><span lang="EN-IN"><span style="font-family: times; font-size: large;">To ensure practical competence, test and
tag training programs often incorporate hands-on training sessions. These
sessions allow participants to practice testing procedures using real
electrical appliances and equipment under the guidance of experienced trainers.
By engaging in practical assessments, trainees can apply their knowledge in
real-world scenarios, gain confidence in their abilities, and develop the
necessary skills to perform test and tag activities effectively.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-IN"><o:p><span style="font-family: times; font-size: large;"> </span></o:p></span><b style="font-family: times; font-size: x-large;"><i>Conclusion</i></b></p>
<p class="MsoNormal"><span lang="EN-IN"><span style="font-family: times; font-size: large;">Test and tag training plays a crucial role
in promoting electrical safety and preventing electrical hazards. By equipping
individuals with the necessary knowledge and skills, these training programs
contribute to the creation of a secure working and living environment. Through
a comprehensive understanding of electrical safety regulations, testing
procedures, and risk management strategies, participants are empowered to
identify and mitigate electrical hazards effectively. Regular test and tag
training remains essential to ensure the highest level of electrical safety and
compliance.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family: georgia;"><b><i><span lang="EN-IN"><o:p><span style="font-size: large;"> </span><span style="font-size: medium;">This article is brought to you by </span></o:p></span><span style="background-color: white; color: #202124; text-wrap: nowrap;"><span style="font-size: medium;">Lucas Smith from New Zealand</span></span></i></b></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-87518080750182860242023-03-07T07:58:00.001+03:002023-03-07T22:35:59.277+03:00LG home theater model HT302 came in with low audio output now repaired <p><span style="font-family: verdana; font-size: large;">I received this home theater from a customer who wanted it checked by a technician.<span style="text-align: justify;"> </span></span></p><div style="text-align: justify;"><span style="font-family: verdana; font-size: large;"><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiR3eG4Rs3OOD-_ROtpHv1hm8VVOOS_XZH2HBelJRAkZpvZiRpD2eKF6lai_GwZNBS8VFsGQlCAdn5yYuMyoet_blCz0w3Cfvr1F4FITSt5jsSYvDlKqsAH0FrU3vZOlFgwn033U0T7Z09ZNCiNyclzZakR2lZXOh1k-ZAPpcVY8MrKB_5WqxVf8uomdA/s624/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="324" data-original-width="624" height="208" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiR3eG4Rs3OOD-_ROtpHv1hm8VVOOS_XZH2HBelJRAkZpvZiRpD2eKF6lai_GwZNBS8VFsGQlCAdn5yYuMyoet_blCz0w3Cfvr1F4FITSt5jsSYvDlKqsAH0FrU3vZOlFgwn033U0T7Z09ZNCiNyclzZakR2lZXOh1k-ZAPpcVY8MrKB_5WqxVf8uomdA/w400-h208/v1.jpg" width="400" /></a></div></span></div><p><span style="font-family: verdana; font-size: large;"><span></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: large;">Complains was low audio output, I inquired from him a brief history of the machine and told me that he bought the machine in 2007 and never taken it to a technician until last week it was working well but developed low output for the last few days.</span><p></p><p><span style="font-family: verdana; font-size: large;">I opened the machine and did a thorough scanning of the power supply board and mainboard and noted two capacitors with top part swollen.</span></p><p><span style="font-family: verdana; font-size: large;">I replaced them expecting it to solve the problem one touch but I was wrong, after changing the two capacitors there was still no change.</span></p><p><span style="font-family: verdana; font-size: large;">Since the customer hinted the machine was bought in the year 2007, means the machine has been working for the last 16 years failthfuly, therefore I decided to do more test on capacitors which from my experience they age faster than other components.</span></p><p><span style="font-family: verdana; font-size: large;">I did test all capacitors on the power board using an ESR meter and got several culprits as you can see below which according to my ESR meter they were way far from the normal capacitors.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbWi6QzbBTCqtD9BLuEPuNErx5YOhYXncI7DYbZ3xvHyRruIbU77UgALhIdj0eTSPq4mnQT7joEIC2znvONOerUhT0HAoe8800kccbE_hsqHw44XBj_SWBDeHbKpd89MMPGp9ggebODwr5t-PzOojIjClSKaz68yT3MIKWRYmnH5Ouhjr_gEkEfrlwww/s624/v2.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="310" data-original-width="624" height="199" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhbWi6QzbBTCqtD9BLuEPuNErx5YOhYXncI7DYbZ3xvHyRruIbU77UgALhIdj0eTSPq4mnQT7joEIC2znvONOerUhT0HAoe8800kccbE_hsqHw44XBj_SWBDeHbKpd89MMPGp9ggebODwr5t-PzOojIjClSKaz68yT3MIKWRYmnH5Ouhjr_gEkEfrlwww/w400-h199/v2.jpg" width="400" /></span></a></div><p></p><p><span style="font-family: verdana; font-size: large;">I replaced all of them and now was time to test and see if there is improvement.</span></p><p><span style="font-family: verdana; font-size: large;">I loaded it with my USB flash disk and the results were awesome!</span></p><p><span style="font-family: verdana; font-size: large;"> </span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-yz_nNU-PcMME9VlmX_oLLYL9kDJnKQaBpjW3Ded4I0PN_UQpic_PFpJg6IZSs85AC0aX1JwTTcPru-B4-K9PNuxrDZQI0omV9ttGZ6P8kN8odSg2iFuIsnqnrDhB5Vj7MN9uMsgP14rKQlnTYatiCiQ0rmPJTxaIxQB8W17s9AMBLiegeRMScjAdwQ/s624/v3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="388" data-original-width="624" height="249" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-yz_nNU-PcMME9VlmX_oLLYL9kDJnKQaBpjW3Ded4I0PN_UQpic_PFpJg6IZSs85AC0aX1JwTTcPru-B4-K9PNuxrDZQI0omV9ttGZ6P8kN8odSg2iFuIsnqnrDhB5Vj7MN9uMsgP14rKQlnTYatiCiQ0rmPJTxaIxQB8W17s9AMBLiegeRMScjAdwQ/w400-h249/v3.jpg" width="400" /></a></span></div><span style="font-family: verdana; font-size: large;"><br /></span><p></p><p><span style="font-family: verdana; font-size: large;">Thank you, guys,</span></p><p><span style="font-family: verdana; font-size: large;">See you in the next class</span></p><p><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 19.9733px; mso-bidi-font-size: 11.0pt;"> </span><b style="font-family: verdana; font-size: x-large;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-40218027556132515942022-10-08T14:48:00.001+03:002022-10-08T15:27:14.962+03:00ARMCO Microwave oven came in dead now repaired!<p><span style="font-family: "Bookman Old Style", serif; font-size: 14pt;">I received this microwave
from a client who wanted it checked by a technician.</span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">Initial test indicated
the machine was totally dead, I opened it and tested the power supply fuse and
found it okay.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">Next, I checked the control
panel and found inductor L101 was open, I followed that line and noted it was
feeding IC100(NK364PN) and therefore suspected it could be shorted.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEga_PoWDdCUE8ZJ54bkQdkvZTRdAASuh0UhPpH37CuXZ4is72Wd3BDVyguBn_Jqd_hH1TLNBVaCssXv9-nG7v-_9BAayndTBQXOdNuopDVMyoDYYPHfB7qxiS4FU5sXSFI2muqkoXDbiSceqfNy6h67nhxPU0hbubLCQscZp5h89ELdpRbfG3JGiU15CA/s371/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="294" data-original-width="371" height="318" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEga_PoWDdCUE8ZJ54bkQdkvZTRdAASuh0UhPpH37CuXZ4is72Wd3BDVyguBn_Jqd_hH1TLNBVaCssXv9-nG7v-_9BAayndTBQXOdNuopDVMyoDYYPHfB7qxiS4FU5sXSFI2muqkoXDbiSceqfNy6h67nhxPU0hbubLCQscZp5h89ELdpRbfG3JGiU15CA/w400-h318/v1.jpg" width="400" /></a></div><span style="font-family: "Bookman Old Style", serif; font-size: 14pt;"><span><a name='more'></a></span>The best test for I.Cs
is direct replacement and hence went to the shop looking for one but I was not
lucky.</span><p></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">Next option is to import,
I got it from Ali.Express, took two weeks to ship to Kenya.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I informed the client
and said he has no problem with that and hence I placed the order.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">For the inductor I bought
is locally and therefore waiting was for only the I.C.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I received the I.C in
my hands after two weeks and did the replacement and after applying the power I
was happy with the results.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I informed the client
and was very happy, just when he wanted to come to pick it I noted something
very strange.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">The machine was getting
very hot, around the magnetron side of the out cover.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I opened the machine
and noted the fan was not rotating and therefore needed some tests.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6lhFCYgOPcQTvZ62PxlwmXPUdfBwV3WJ9h9pbu5oosxFP8hX2rW69bjJQEDKrFJvsxsxmsddFQmPZBsQe-jwki_8TCPrX1eIzud9iXmyzm7KlRfDcrDPC6qER9xnAzuIOZQ8AVgJ6tYwvbx_NBk0ZdrBRjTNKSajP8sxHtuvt1fIa2tfHZru_8jHK_A/s623/v2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="450" data-original-width="623" height="289" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6lhFCYgOPcQTvZ62PxlwmXPUdfBwV3WJ9h9pbu5oosxFP8hX2rW69bjJQEDKrFJvsxsxmsddFQmPZBsQe-jwki_8TCPrX1eIzud9iXmyzm7KlRfDcrDPC6qER9xnAzuIOZQ8AVgJ6tYwvbx_NBk0ZdrBRjTNKSajP8sxHtuvt1fIa2tfHZru_8jHK_A/w400-h289/v2.jpg" width="400" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I tested across the fan
connectors and got open circuit, I removed it out the machine for further
scrutiny and noted one side coil wire was broken out of the circuit.(hanging loose)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I did the re-soldering slowly
and carefully and now the reading was 405 ohms.<o:p></o:p></span></p>
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOUzlzJgvQPBwsq2cfeON_QjX355ZbSRtq8H8yf-N9ZbepQEFzAjVWTCR7WMI2yyDA0ygaoTch7PdmgLhieDrLNrk-50Q3baplYHOmbzRy629F9FI3lpzrczbhr6F3W1D8Ps29rjyauvTJ_L2RsFXhYy895cXpaSuN0s3xLXC6ne1zFzzSsHjotYoryQ/s484/v3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="484" data-original-width="295" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOUzlzJgvQPBwsq2cfeON_QjX355ZbSRtq8H8yf-N9ZbepQEFzAjVWTCR7WMI2yyDA0ygaoTch7PdmgLhieDrLNrk-50Q3baplYHOmbzRy629F9FI3lpzrczbhr6F3W1D8Ps29rjyauvTJ_L2RsFXhYy895cXpaSuN0s3xLXC6ne1zFzzSsHjotYoryQ/w244-h400/v3.jpg" width="244" /></a></div><p class="MsoNormal"><span style="font-family: "Bookman Old Style", serif; font-size: 14pt;">I re-installed the fan
and after testing I was happy with the results.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdlf4hQxNEpUnmw1WGMOEZpkkVKmFRo-40T6T7P9DewktQZ0n7QPQN3TOPHyMYeGBsyMq1BLhBqUkOcNPFdIk65tDpqlksPc8ll1LlSV7u6-CScdh_g3NN2doBoAa6firnICp85UYCJmCCRX3t6f6_MA456-apdv-P4XFBXMKDb9z9IEIqRQwSmy1KVA/s624/v4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="387" data-original-width="624" height="248" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgdlf4hQxNEpUnmw1WGMOEZpkkVKmFRo-40T6T7P9DewktQZ0n7QPQN3TOPHyMYeGBsyMq1BLhBqUkOcNPFdIk65tDpqlksPc8ll1LlSV7u6-CScdh_g3NN2doBoAa6firnICp85UYCJmCCRX3t6f6_MA456-apdv-P4XFBXMKDb9z9IEIqRQwSmy1KVA/w400-h248/v4.jpg" width="400" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 18pt;">Thank you guys</span></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 27.6px; mso-bidi-font-size: 11.0pt;"> </span><span style="font-size: 18pt;">See you in the next class</span></p><p class="MsoNormal"><span style="font-size: 18pt;"><br /></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style",serif; font-size: 14pt; line-height: 107%; mso-bidi-font-size: 11.0pt;"><o:p> </o:p></span><b style="font-family: verdana; font-size: x-large;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com2tag:blogger.com,1999:blog-1120987647049297737.post-32255352180027827662022-09-10T10:48:00.001+03:002022-10-08T14:48:43.290+03:00 LG HOME THEATER MODEL DH3140S COME DEAD NOW REPAIRED.<p><span style="font-size: large;"><span style="font-family: "Bell MT", "serif";">I received this home theater from a client who wanted it
checked by a tech, I applied the power and noted there was no sign of life.</span><span style="font-family: "Bell MT", "serif";"> </span></span></p><p class="MsoNormal"><span style="font-family: "Bell MT", "serif"; line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixGaq1H_X1C3JXv-LXJcuMQ3jvyG2Br-nDkFasOK1cCcd1UXG1yWJ-BMg27KZSJBttu246oUcPbCQN8l_O2EtfPpNJrQp77KyWrRiEQiAm2mzgvPOXdBHC-XmuU0T9cdqQNxgOrMHPzaY7cbag3KKgY_EKMPR89axdxAfOcA0s3rp_TY9jGo64yKqFIQ/s1218/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="557" data-original-width="1218" height="292" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixGaq1H_X1C3JXv-LXJcuMQ3jvyG2Br-nDkFasOK1cCcd1UXG1yWJ-BMg27KZSJBttu246oUcPbCQN8l_O2EtfPpNJrQp77KyWrRiEQiAm2mzgvPOXdBHC-XmuU0T9cdqQNxgOrMHPzaY7cbag3KKgY_EKMPR89axdxAfOcA0s3rp_TY9jGo64yKqFIQ/w640-h292/v1.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bell MT", "serif";"><span style="font-size: large;">I opened up the machine and proceeded to scan the whole
system, beginning with the power board and later motherboard.</span></span></p><p class="MsoNormal"><span style="font-family: "Bell MT", "serif"; line-height: 115%;"><span style="font-size: large;">I noted two capacitors with top part slightly swollen on the power supply section,
usually if you get a capacitor with top part swollen it is advisable to replace it directly with testing.<span></span></span></span></p><a name='more'></a><span style="font-size: large;"><o:p></o:p></span><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRyy4jXAFWnB0xmu2PGZbjJMXTuZqUB2JNfPasThjMg-yXDzo3LLkoku3XAokJdFnrLr64wCM-JuRlVmuYpp1hsek3MxaICirq-cSbhBl-Jt_SwRfMDa9Ndz4KH8X3HWuR13lQo5D7Y2SBB-2jzM-eyzT9CmTzyeCvskXEWfophSBk3dS-0_VH8JaoVQ/s926/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="863" data-original-width="926" height="596" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRyy4jXAFWnB0xmu2PGZbjJMXTuZqUB2JNfPasThjMg-yXDzo3LLkoku3XAokJdFnrLr64wCM-JuRlVmuYpp1hsek3MxaICirq-cSbhBl-Jt_SwRfMDa9Ndz4KH8X3HWuR13lQo5D7Y2SBB-2jzM-eyzT9CmTzyeCvskXEWfophSBk3dS-0_VH8JaoVQ/w640-h596/v1.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bell MT", "serif";"><span style="font-size: large;">I proceeded to the mother board and found two capacitors with
outer cover ripped off and one with top part slightly swollen as you can see below.</span></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJfgpL-vFb0j-Y3OIcyfQhdhJ2KdWILeawc1Nva0xU1CUoP7xFxEdfApgvauQiUneb2xvLV3MqZzZSvL4ciPxU0h7tQhV6DN2KW5YNDkYvFAZEPCH_myKC5duDGvWyCb2yT-wAQtPw-pWFAEhoEMmGrp9H-Ee9-fAm6lRbYD7FvEpJ75-nGbeuqsbCpg/s909/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="909" data-original-width="673" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJfgpL-vFb0j-Y3OIcyfQhdhJ2KdWILeawc1Nva0xU1CUoP7xFxEdfApgvauQiUneb2xvLV3MqZzZSvL4ciPxU0h7tQhV6DN2KW5YNDkYvFAZEPCH_myKC5duDGvWyCb2yT-wAQtPw-pWFAEhoEMmGrp9H-Ee9-fAm6lRbYD7FvEpJ75-nGbeuqsbCpg/w474-h640/v1.jpg" width="474" /></span></a></div><span style="font-family: "Bell MT", "serif";"><span style="font-size: large;">I decided to replace all capacitors with the same capacitance
value but higher voltage rating to avoid come back.</span></span><p></p><p class="MsoNormal"><span style="font-family: "Bell MT", "serif"; line-height: 115%;"><span style="font-size: large;">After replacing the capacitors I applied power and the
machine came up smiling.<o:p></o:p></span></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAHytB3gLO_Gw-ifwiMHX93sHeBxr3eIJebF4KYfunqa8Bu4jmzazEKnrQgeL9Ndg9BiiI0T7WPg7EEjqe8HoEAAo6N81pFA52WV4F62OQqSFxeCd84PM8eneWhJv7o7nvlfWktjDKraNKxjL9rAqnGT_b436gwBAfSedpHtSADKU87Qn7kwtMwWbYwg/s1222/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="486" data-original-width="1222" height="254" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAHytB3gLO_Gw-ifwiMHX93sHeBxr3eIJebF4KYfunqa8Bu4jmzazEKnrQgeL9Ndg9BiiI0T7WPg7EEjqe8HoEAAo6N81pFA52WV4F62OQqSFxeCd84PM8eneWhJv7o7nvlfWktjDKraNKxjL9rAqnGT_b436gwBAfSedpHtSADKU87Qn7kwtMwWbYwg/w640-h254/v1.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><b style="font-family: verdana; font-size: x-large;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></p><p></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 27.6px; mso-bidi-font-size: 11.0pt;">Thank you guys<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 27.6px; mso-bidi-font-size: 11.0pt;"> </span><span style="font-size: 18pt;">See you in the next class</span></p><div class="separator" style="clear: both; text-align: center;"><br /></div><p></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-85077811138185203342022-07-07T13:21:00.001+03:002022-07-07T13:21:12.151+03:0032 inch Vitron Television picture upside down after motherboard replacement now fixed<p><span style="font-family: verdana; font-size: large;">I received this television from a customer who wanted it
checked by a technician.</span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">She told me that she suspect a loose cable and hence minor
problem.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I checked the voltage and found they are present even on the
secondary side of the power supply.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I also noted some components were getting too hot on the
secondary side (Never torch components on the primary side unless if you power off
and remove the power cable from the outlet) and since the power On led was off
means the microprocessor was also not getting power.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I decided to do new motherboard replacement, getting these
boards in my market is quite easy.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I visited the shop and I was back with one which was exactly the
same and therefore I expected easy fix, plug and play.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">And yes the television fired on beautifully from the back I could
see backlights are on.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Turning to the screen I noted the picture/image were upside
down like you can see below.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXKj8pvA9UBDosicTGdvAXuF35mc1mNdgqy2OqgJqMxi6zcnHK9TQLFwcTBcYFH2b7P6g_B3a2RaEcSswomf2dPX3_CUDcHshr7-PSUOnrp9tgsSAwmiUWnp08_BAta4Ua2cycRp3fidlw5wDaVh9-B22EKVPKNVO0Iid-Hdrh1wHAVXO_795BNozQdQ/s974/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="643" data-original-width="974" height="422" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXKj8pvA9UBDosicTGdvAXuF35mc1mNdgqy2OqgJqMxi6zcnHK9TQLFwcTBcYFH2b7P6g_B3a2RaEcSswomf2dPX3_CUDcHshr7-PSUOnrp9tgsSAwmiUWnp08_BAta4Ua2cycRp3fidlw5wDaVh9-B22EKVPKNVO0Iid-Hdrh1wHAVXO_795BNozQdQ/w640-h422/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;"><span></span></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: large;">I did some Google search about this issue and realized it is
quite common.<o:p></o:p></span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">The solution was to use remote control to access the factory
setting.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">In my case I had no remote control and the way out was to
change the memory ic. From the old board to the new board.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6zNWMAwt1lVzD_GDPQA54DAFM_Unz-s1lE6qtWsHxFgQeXcWZuP9aB-xDJJIVCLiRPluO9ElGVj5Pas17oX6odf4FZfCJZlkWUYuf7bP-22qsTnJ1XZfxD3NNvRKzqCJwm3EBWfLx72N952YTXayYpwF6ZOMQB_kh8y8HJ0ZFSfGOFXcPzg2AnJeaHg/s302/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="224" data-original-width="302" height="475" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6zNWMAwt1lVzD_GDPQA54DAFM_Unz-s1lE6qtWsHxFgQeXcWZuP9aB-xDJJIVCLiRPluO9ElGVj5Pas17oX6odf4FZfCJZlkWUYuf7bP-22qsTnJ1XZfxD3NNvRKzqCJwm3EBWfLx72N952YTXayYpwF6ZOMQB_kh8y8HJ0ZFSfGOFXcPzg2AnJeaHg/w640-h475/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal" style="margin-left: 0.5in;"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Memory ic on the old board<o:p></o:p></span></span></p><p class="MsoNormal" style="margin-left: 0.5in;"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsg_ezZzeKPqHKy_lIPzld5OdLHIKZWXJ6_C0UTl6IcGHaFW2r1kR0SsDMnJpOT-m3H8JG97lFQD9SRUGOLttotZ9P0GVHea2kynng1T044XEYhDsItXm5MqMI7_QJhURd5do9myYHhizrQw6EaY34JEO8gIIaZfu3noWQQ_mHUi-Jz0ZexdSgaKKKIQ/s229/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="229" data-original-width="173" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgsg_ezZzeKPqHKy_lIPzld5OdLHIKZWXJ6_C0UTl6IcGHaFW2r1kR0SsDMnJpOT-m3H8JG97lFQD9SRUGOLttotZ9P0GVHea2kynng1T044XEYhDsItXm5MqMI7_QJhURd5do9myYHhizrQw6EaY34JEO8gIIaZfu3noWQQ_mHUi-Jz0ZexdSgaKKKIQ/w302-h400/v1.jpg" width="302" /></a></div><span style="font-family: verdana; font-size: x-large;">After replacing the new memory ic with the old one from the
old board the problem was solved as you can below.</span><div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0t63Fhrf4B1JM8HZ8w9nsl42TfLqOq8gD8It86DD_uzlWo39jD0CmpT52KbQ3ex9oJ7OsF1A3TQwjtqrLjuk3M7gsdC1eBz6bTkDq3zWuJVTcUacNdAWRBJLCDYSAh01P_XNmw9NOZP91gGhekO1-84B6fa2k6Nc5f-6tIR2GrGZy3lEKesP7mkZRjQ/s1164/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="697" data-original-width="1164" height="384" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0t63Fhrf4B1JM8HZ8w9nsl42TfLqOq8gD8It86DD_uzlWo39jD0CmpT52KbQ3ex9oJ7OsF1A3TQwjtqrLjuk3M7gsdC1eBz6bTkDq3zWuJVTcUacNdAWRBJLCDYSAh01P_XNmw9NOZP91gGhekO1-84B6fa2k6Nc5f-6tIR2GrGZy3lEKesP7mkZRjQ/w640-h384/v1.jpg" width="640" /></a></div><p class="MsoNormal"><b style="font-family: verdana; font-size: x-large;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></p><p></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 27.6px; mso-bidi-font-size: 11.0pt;">Thank you guys<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 27.6px; mso-bidi-font-size: 11.0pt;"> </span><span style="font-size: 18pt;">See you in the next class</span></p></div>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-19221785813553530862022-07-01T11:52:00.007+03:002022-07-01T11:55:12.269+03:0021 Inch CRT Sanyo Television (model CM21YS2S) came in dead now repaired<p> <span style="font-size: 18pt;">I received this television from a customer
who wanted it checked.</span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">CRT television are getting phased out here
in Kenya very fast but still am getting a few from customers like the one
before us.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">I asked the customer a brief history of the
problem even before opening.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">He told me that it started to take time to
power up, 1 hour, 2 hours, 3 hours 9 hours, one day and eventually never
powered again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">With that I concluded the problem is
capacitor related and therefore when I opened it I first did scanning the
whole board and noted one capacitor with top part slightly swollen on the
vertical circuit.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpJMj8-dIQkpWygkuVL0oj7qt0leNjckSzdACxo4JWitHaWcoQkO-MoHGWyvC1c9_luZ6BjImCo1sGEn6irNxFIHAtYEje7IvID4aDqq-wgl4QzRQP3dVRhU7cxXxxdiR-6DAw1H1OuJwNfc-dfuk-JEoYgvABQq1bHfwuNV_HVxh0niuNAgcJEdEIQQ/s627/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="616" data-original-width="627" height="628" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpJMj8-dIQkpWygkuVL0oj7qt0leNjckSzdACxo4JWitHaWcoQkO-MoHGWyvC1c9_luZ6BjImCo1sGEn6irNxFIHAtYEje7IvID4aDqq-wgl4QzRQP3dVRhU7cxXxxdiR-6DAw1H1OuJwNfc-dfuk-JEoYgvABQq1bHfwuNV_HVxh0niuNAgcJEdEIQQ/w640-h628/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;"><span></span></span></p><a name='more'></a>I replace the capacitor hoping for the best but after
powering on I noted the TV was still not powering on but at least this time the
red led is on but blinking.<o:p></o:p><p></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">I pulled my ESR meter and started testing all capacitors on
the board especially the secondary side and noted most capacitors were faulty, I
changed all of them but I could not solve the blinking led.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">Since time was not on my side I decided to keep it aside and
work on it later.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">Later in the evening I decided to continue troubleshooting
the board and this time I decided to test capacitors on the power supply
section, usually there are few capacitors on this section and therefore I
started with the one which filter the startup voltage to the control IC STR
W6754.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">The first capacitor passed the test with flying colors but
was not happy with the second one as you can below.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjajxVh6zoI1DAst-tYOGQ4wb-jdiV8PuyiaI8lPTfXrg4Q9tgm7ln_g99OmdRFLAN7PjqoLJvoeCJK30zGm5FIgRxgqL7TBDZa1ZN5cS-z8ii2gT5jigDUN2dkPz5bL2TjHbzQdhf6WFKvS3v9WE6NBjYQvYThmMzyFNF0pBn6oqxkskrjZRH4psV2gg/s645/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="645" data-original-width="505" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjajxVh6zoI1DAst-tYOGQ4wb-jdiV8PuyiaI8lPTfXrg4Q9tgm7ln_g99OmdRFLAN7PjqoLJvoeCJK30zGm5FIgRxgqL7TBDZa1ZN5cS-z8ii2gT5jigDUN2dkPz5bL2TjHbzQdhf6WFKvS3v9WE6NBjYQvYThmMzyFNF0pBn6oqxkskrjZRH4psV2gg/w502-h640/v1.jpg" width="502" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%;">The capacitor was rated 47uF/35V, here I was expecting ESR reading
of less 1</span><span style="font-size: 18pt; line-height: 115%;">Ω</span><span style="font-size: 18pt; line-height: 115%;"> but here I
was getting 0.15K </span><span style="font-size: 18pt; line-height: 115%;">Ω</span><span style="font-size: 18pt; line-height: 115%;">, multiply
by 1000 you get 150 </span><span style="font-size: 18pt; line-height: 115%;">Ω</span><span style="font-size: 18pt; line-height: 115%;">, This ESR
reading can even bring a fighter jet down and therefore the television was
justified not to power up.</span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">I changed the capacitor and now it was time to test for any
improvements.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7vCeBSdqKLsk1wvwj8aozuMWw5wQJiquuJHbmwzKxxpHDU-6F0tgPPXfy7LY5zSa1eYfqLrw-_A9Wbsq9BJxdkQpJyg_5Yddfg4Qv8EBMXus9hvtKMz5RSxz6etQp3J3oNYnlEof-Dr2OLxJntT6qd79HWsSdUEX1o9JrsJhjtTyWigJq-_vbpnQKSA/s627/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="512" data-original-width="627" height="522" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7vCeBSdqKLsk1wvwj8aozuMWw5wQJiquuJHbmwzKxxpHDU-6F0tgPPXfy7LY5zSa1eYfqLrw-_A9Wbsq9BJxdkQpJyg_5Yddfg4Qv8EBMXus9hvtKMz5RSxz6etQp3J3oNYnlEof-Dr2OLxJntT6qd79HWsSdUEX1o9JrsJhjtTyWigJq-_vbpnQKSA/w640-h522/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 18pt;">After applying the power I noted the red lights was now
stable and that put a smile on my face.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTIa1HiNFM3FNqeQcKcaT6D5EkIYsk1gGrl6cRQeKGkeOIcxBwJjG0FypPQ-xp3-yJRDZVukWwhI8CwUW4bX1CI5al_Ypeehg3dmPt8BghNyfF1smQ56RejZA_RSB79WmQoezxv4vIY8FM7IV_F6UZUoj254s-FoOitgTaTQICpQxditUX3zZQIDSEFw/s743/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="743" data-original-width="627" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTIa1HiNFM3FNqeQcKcaT6D5EkIYsk1gGrl6cRQeKGkeOIcxBwJjG0FypPQ-xp3-yJRDZVukWwhI8CwUW4bX1CI5al_Ypeehg3dmPt8BghNyfF1smQ56RejZA_RSB79WmQoezxv4vIY8FM7IV_F6UZUoj254s-FoOitgTaTQICpQxditUX3zZQIDSEFw/w540-h640/v1.jpg" width="540" /></a></div><span style="font-size: 18pt;">I later re-assembled the board back to the tube and
everything worked well.</span><div><span style="font-size: 24px;"><br /></span></div><div><p class="MsoNormal"><span style="line-height: 18.4px;"><span style="font-family: verdana; font-size: large;">Online basic electronics classes now available here. Get feedback from student who has completed the course <a href="http://www.humtechelectronicschool.com/2021/04/feedback-from-students-who-have.html">here</a>.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 18.4px;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p><p class="MsoNormal"><span style="font-size: large;"><span style="line-height: 20.7px;"><o:p><span style="font-family: verdana;"> </span></o:p></span><b style="font-family: verdana;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></span></p><p></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">Thank you guys<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;"><o:p> </o:p></span><span style="font-size: 18pt;">See you in the next class</span></p></div>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-65092450488184793582022-06-21T17:53:00.005+03:002022-07-01T11:56:14.803+03:00Epson projector model EB-S02 with “Error in Auto Iris” now repaired.<p><span style="font-size: large;"><span>This projector was brought by a friend who needed it checked,
I powered the machine and this is what I saw on the screen.</span></span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL6LNYEqddcr2SHI8uU2-x5s1mbnokkWp06PX3Ug1MqHcvdI4zZE6k004T76HLtqWo1_wICQSCV5iy_jox_A7gOUtjyS-7v8ibXlY7kKpGI4toPt0kbSv_751nYVclhFbVFtC6aMzIGYzt-MwkvGpUWRNgW6d4UN2r3X1qknPTH4EOp13bAk9kpCQpaQ/s374/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="195" data-original-width="374" height="334" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL6LNYEqddcr2SHI8uU2-x5s1mbnokkWp06PX3Ug1MqHcvdI4zZE6k004T76HLtqWo1_wICQSCV5iy_jox_A7gOUtjyS-7v8ibXlY7kKpGI4toPt0kbSv_751nYVclhFbVFtC6aMzIGYzt-MwkvGpUWRNgW6d4UN2r3X1qknPTH4EOp13bAk9kpCQpaQ/w640-h334/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%; mso-bidi-font-size: 11.0pt;"><span style="font-size: large;"></span></span></p><a name='more'></a><span style="font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt;">A technician is more or less like a medical doctor but
medical doctors have added advantage since human being can talk and explain how
they are feeling. <o:p></o:p></span><p></p>
<p class="MsoNormal"><span style="font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt;">In electronics we rely on symptoms and error codes if
generated, in the case at hand we have “Auto iris error” code.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt;">From the above error code, I did some research and noted the
error is usually caused by problem with Auto Iris Assy.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNeKk_n_AeMVN4lW2I0b88yowMUnRlS4OD-OWzSti8MPSXeQILo-JmklEpNzhClBexGEJftVLXlbKvHswsc9j_hKqso781_7Iijnp7ZeKnWZo4xIHy8qGDXTY2hLyHL7Nrs7U9ckRpUrX37kS4ZNQN__Mi0WgBQo3FkGdiJgJpBHtQqpdUFOUwZw9cSQ/s627/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="504" data-original-width="627" height="514" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNeKk_n_AeMVN4lW2I0b88yowMUnRlS4OD-OWzSti8MPSXeQILo-JmklEpNzhClBexGEJftVLXlbKvHswsc9j_hKqso781_7Iijnp7ZeKnWZo4xIHy8qGDXTY2hLyHL7Nrs7U9ckRpUrX37kS4ZNQN__Mi0WgBQo3FkGdiJgJpBHtQqpdUFOUwZw9cSQ/w640-h514/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;">To access this module you need to open up the machine below,Epson
projector model EB-S02</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3VDonhmoLiBRrwEg7gwgIatGWCRDOVbgnP9FMsoZ7mW07fxALw5L1kKTtOYTrkTZi32JbxTE2Y5gIpCXsHkZw_d-VBhGDSumPxdqzmRws3CZSYwSWlhj7mXZ9FNKag5uNhPrXLcfX9BE-gcTUh4kmgxHkz6q4yZ2S_lmo6EGTy6hYmfdrHIWahB_K4Q/s540/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="419" data-original-width="540" height="496" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3VDonhmoLiBRrwEg7gwgIatGWCRDOVbgnP9FMsoZ7mW07fxALw5L1kKTtOYTrkTZi32JbxTE2Y5gIpCXsHkZw_d-VBhGDSumPxdqzmRws3CZSYwSWlhj7mXZ9FNKag5uNhPrXLcfX9BE-gcTUh4kmgxHkz6q4yZ2S_lmo6EGTy6hYmfdrHIWahB_K4Q/w640-h496/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;">After removing the cover</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinl3w3C8V4EB8vB4pgT_PiR9nDZ5QFSp76iea73QXMifUVDHxHQ9T42ficlNsjVf-sRTpCr2FKQwpJ6LnYxVCjTUBavbwL39p0p0mKeWhdhu2kBDudPvir7mZtns5x5IhW1cj-kN1DcXP8TibBI4AshJGs0n90c_E1UPxb21ps93lyilFpCM-DhDIRPw/s627/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="524" data-original-width="627" height="534" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEinl3w3C8V4EB8vB4pgT_PiR9nDZ5QFSp76iea73QXMifUVDHxHQ9T42ficlNsjVf-sRTpCr2FKQwpJ6LnYxVCjTUBavbwL39p0p0mKeWhdhu2kBDudPvir7mZtns5x5IhW1cj-kN1DcXP8TibBI4AshJGs0n90c_E1UPxb21ps93lyilFpCM-DhDIRPw/w640-h534/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;">Motherboard now removed</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiTDtxuvVZZK1_prVxq95oF8MIu2YZl6_cQUJ2eyONWn3nfTWfQ0yNNKCy2kdxcvqAtfxrci2MHFk6993UnmG7yjgeDcRo8AyaieH6lwknBsyH_RTGT9jHt2C6cRbB18UiNJkVNRIRn4fn1u0Btg1WOuhiuCC9-5RBMmVZHeaffjE7BEuZHCmO6DhIfA/s610/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="410" data-original-width="610" height="430" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgiTDtxuvVZZK1_prVxq95oF8MIu2YZl6_cQUJ2eyONWn3nfTWfQ0yNNKCy2kdxcvqAtfxrci2MHFk6993UnmG7yjgeDcRo8AyaieH6lwknBsyH_RTGT9jHt2C6cRbB18UiNJkVNRIRn4fn1u0Btg1WOuhiuCC9-5RBMmVZHeaffjE7BEuZHCmO6DhIfA/w640-h430/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;">Remove the optical engine Ass.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifKkGcGXrnwnpaIon6MvJCfDObUpcJyoFElCl2lil-SAS0zHHXhHW8AggEABoQiqG_s_cYUTpbQ0x2SAc8-BTV-Mou3kUCqnCkXcX1_V19IKfLehAu-pwoXS3dhbvFH4e4fGedUUdJWEM1oa3BnNprNNajCY0iZi4RY5e-iRmQ_smeuwuEfiT5FZmO1Q/s622/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="462" data-original-width="622" height="476" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifKkGcGXrnwnpaIon6MvJCfDObUpcJyoFElCl2lil-SAS0zHHXhHW8AggEABoQiqG_s_cYUTpbQ0x2SAc8-BTV-Mou3kUCqnCkXcX1_V19IKfLehAu-pwoXS3dhbvFH4e4fGedUUdJWEM1oa3BnNprNNajCY0iZi4RY5e-iRmQ_smeuwuEfiT5FZmO1Q/w640-h476/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;">Auto Iris assembly is part of optical engine.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4cMIgEPDGdnd4oMnmMHBbFbs52uEEUJbrlZfNrvIdy5PZ6DWHNkJz565m9aeHddNcHePZNgTqrV8eLlYPEHZMJw1QDjCPv2WRkHekuunpPDGugJ4Qz9ATxQfHFmsj5cZ9BMKDLp9Ypo-42GhhYG_jI6kF1uwB66KbOFqVIg3ZHkrylHfzofiKIa34VQ/s476/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="354" data-original-width="476" height="476" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4cMIgEPDGdnd4oMnmMHBbFbs52uEEUJbrlZfNrvIdy5PZ6DWHNkJz565m9aeHddNcHePZNgTqrV8eLlYPEHZMJw1QDjCPv2WRkHekuunpPDGugJ4Qz9ATxQfHFmsj5cZ9BMKDLp9Ypo-42GhhYG_jI6kF1uwB66KbOFqVIg3ZHkrylHfzofiKIa34VQ/w640-h476/image.jpg" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="font-size: large;"><span style="line-height: 115%; mso-bidi-font-size: 11.0pt;">In human being,”</span><span style="border: 1pt none windowtext; color: black; font-family: "Georgia","serif"; letter-spacing: -0.4pt; line-height: 115%; mso-bidi-font-family: "Times New Roman"; mso-border-alt: none windowtext 0in; mso-fareast-font-family: "Times New Roman"; padding: 0in;">The
function of the iris in the eye is to control the amount of light that reaches
the retina. It does this by changing the size of the pupil, the
transparent window that allows light into the eye's interior.</span></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5ejb10XtMT9hP1EblXRmWBoLqImQbSsYnzqicrM_VRIgjMwg1jafNkHkJ6vJKx8M8bLcS_Li4lZuAR3QBOjdr4_mU_Rq7NTcrpEmEftfd_Dgvaqige2SnoqO7sOI81Q-NhNW6GT50qYqv01WTbyhZhyiBVxECAgbbHeaYiKCFROmDcBdbMX9puN2faA/s357/image.jpg" style="margin-left: 1em; margin-right: 1em;"><span style="font-size: large;"><img border="0" data-original-height="212" data-original-width="357" height="190" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5ejb10XtMT9hP1EblXRmWBoLqImQbSsYnzqicrM_VRIgjMwg1jafNkHkJ6vJKx8M8bLcS_Li4lZuAR3QBOjdr4_mU_Rq7NTcrpEmEftfd_Dgvaqige2SnoqO7sOI81Q-NhNW6GT50qYqv01WTbyhZhyiBVxECAgbbHeaYiKCFROmDcBdbMX9puN2faA/s320/image.jpg" width="320" /></span></a></div><p></p><p class="MsoNormal"></p><p class="MsoNormal"><span style="border: 1pt none windowtext; color: black; font-family: "Georgia","serif"; font-size: large; letter-spacing: -0.4pt; line-height: 115%; mso-bidi-font-family: "Times New Roman"; mso-border-alt: none windowtext 0in; mso-fareast-font-family: "Times New Roman"; padding: 0in;">The same case applies to
projector auto Iris and therefore if there is an error on this assembly the
Auto iris error will presents.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="border: 1pt none windowtext; color: black; font-family: "Georgia","serif"; font-size: large; letter-spacing: -0.4pt; line-height: 115%; mso-bidi-font-family: "Times New Roman"; mso-border-alt: none windowtext 0in; mso-fareast-font-family: "Times New Roman"; padding: 0in;">After accessing this module I scanned
it and noted one of the blades was loose and hence not closing well and hence
the error.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="border: 1pt none windowtext; color: black; font-family: "Georgia","serif"; font-size: large; letter-spacing: -0.4pt; line-height: 115%; mso-bidi-font-family: "Times New Roman"; mso-border-alt: none windowtext 0in; mso-fareast-font-family: "Times New Roman"; padding: 0in;">I tightened the small bolts
and re-installed it back to the optical engine assembly and after powering it
up the error was gone.<o:p></o:p></span></p>
<p class="MsoNormal"><br /></p>
<p class="MsoNormal"><span style="font-size: large;"><span style="font-family: verdana;">Thank up guys</span></span></p><p class="MsoNormal"><span style="line-height: 18.4px;"><span style="font-family: verdana; font-size: large;">See you in the next class.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 18.4px;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p><p class="MsoNormal"><span style="line-height: 18.4px;"><span style="font-family: verdana; font-size: large;">Online basic electronics classes now available here. Get feedback from student who has completed the course <a href="http://www.humtechelectronicschool.com/2021/04/feedback-from-students-who-have.html">here</a>.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 18.4px;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p><p class="MsoNormal"><span style="font-size: large;"><span style="line-height: 20.7px;"><o:p><span style="font-family: verdana;"> </span></o:p></span><b style="font-family: verdana;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></span></p>
<p class="MsoNormal"><span style="font-size: large;"><span style="color: black; font-family: "Georgia","serif"; letter-spacing: -0.4pt; line-height: 115%; mso-bidi-font-family: "Times New Roman"; mso-fareast-font-family: "Times New Roman";"><o:p> </o:p></span> </span></p>
<p class="MsoNormal"><span style="font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt;"><o:p> </o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-22564843664088131252022-04-04T12:57:00.005+03:002022-04-04T12:57:56.897+03:0040 inch Samsung LED television model UA40J5000AK dead now repaired!<p><span style="font-family: verdana; font-size: medium;">I received a call from a
client who wanted his television checked by a technician.</span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">It was within the estate, so
using the direction he gave I was able to locate the place effortlessly.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="line-height: 115%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_g2FbzpDNj7UZrpW6oe_xxhRPyI8MSFsSsTiD2h1nMP5a_K2CKicxRvgukXdBO-iUFs-SrEOlXCg-teuqb8MhQPeZCNGEklJxIUX7RADPzVu5GlDuh0OCLL62zRhwOyteMbo07QZjGZPmoUB3DKeYdR65etBZstlXHJOOFph6USHk7Y1VdouZsGBFYA/s553/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="553" data-original-width="415" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_g2FbzpDNj7UZrpW6oe_xxhRPyI8MSFsSsTiD2h1nMP5a_K2CKicxRvgukXdBO-iUFs-SrEOlXCg-teuqb8MhQPeZCNGEklJxIUX7RADPzVu5GlDuh0OCLL62zRhwOyteMbo07QZjGZPmoUB3DKeYdR65etBZstlXHJOOFph6USHk7Y1VdouZsGBFYA/w480-h640/v1.jpg" width="480" /></a></span></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;"><span></span></span></span></p><a name='more'></a><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Upon reaching the place, I
was shown the television, applied the power and indeed the television was dead,
even the power ON led was off.<o:p></o:p></span></span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">I opened the television and did
scanning on both power and main board and could not see any suspect’s area or
component.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">I pulled my meter and tested
the main fuse and to my surprise I found it okay.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">With that I now decided to
do proper troubleshooting, first let me point out here that dead symptoms in
television(LCD-LED) can be caused by power supply failure or main board
failure. You can learn more how to isolate which board is causing dead symptoms
by reading this <a href="https://www.lcd-ledtelevisionrepairguide.com/2019/02/lcd-led-television-repair-guide-dear.html">book</a>.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">From my analysis I concluded
the problem was on the power <span style="mso-spacerun: yes;"> </span>board and
therefore begin doing sample testing on components especially for short.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Since the fuse was intact I could
not suspect shorted component on the primary side since shorted component on
the primary side will lead to instant blow to the main fuse.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">So I begin testing output
component like diodes and transistors which failure rate is quite high.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Testing for shorted
components in circuit is okay but if you find a beep, it is always important to
solder one pin out of the circuit to confirm the actual culprit.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">As I continued testing
secondary output components I got a beep across a diode and I wanted to be sure
if indeed it’s a beep on just low capacitor resistance reading before charging.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">In my case the beep
continued and this put a smile on my face, this could be the culprit.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: medium;">I soldered the two diodes that
had beep out of the circuit and found one was dead short.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9e2Y8JVhs1fz6ombxOaAqvNTltEFgTrtwCxZvQtGL9ad_LVwS0DD6xkGlZu0cvvxzxzWVNmKZ9an3KKLg6tQ3kLm5YI3pJNCfuU3CYFymjrv5BQnkw79PtJLDVVIBK9Rj7J1p1doyYp3FZWTiQU0w1MDQrOkcudRRJ9KfjdUJULPdkpgZSFPHPlYMnQ/s463/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="458" data-original-width="463" height="634" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9e2Y8JVhs1fz6ombxOaAqvNTltEFgTrtwCxZvQtGL9ad_LVwS0DD6xkGlZu0cvvxzxzWVNmKZ9an3KKLg6tQ3kLm5YI3pJNCfuU3CYFymjrv5BQnkw79PtJLDVVIBK9Rj7J1p1doyYp3FZWTiQU0w1MDQrOkcudRRJ9KfjdUJULPdkpgZSFPHPlYMnQ/w640-h634/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Since I was working on site I
had to go back to my shop because I did not have this diode (FR) with me.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">This time I decided to carry
with me the whole board for further testing once I replace the faulty diode.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Back in the shop I salvaged the
diode from a junk board which had same specs with the one which was faulty,
after replacement I tested the board and noted the standby voltage was present
and stable.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">I went back to the client
place hoping for the best and after re-installing the power board, I applied
the power and I noted the backlights were on since the television was placed
back up.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">This put a smile on my face,
this is the final results.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="line-height: 115%;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxBszPEUB50q26Z0TE2mu3jtugsjMEefGbY4H3U8SCzCHRgTFkZMvvMIsXnpD4RiIR903Fbl5MFgJpfNMXXdGXX3XdAcEqPYZOKzVjukRoPgfj30KYfe1XHWyhH4Rvc2dp2JF0d7f_6M8PkHYcejIRrJIsM5gSFVzdre0LqHHwUZQQmWR15gnShM8sKQ/s442/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="442" height="406" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxBszPEUB50q26Z0TE2mu3jtugsjMEefGbY4H3U8SCzCHRgTFkZMvvMIsXnpD4RiIR903Fbl5MFgJpfNMXXdGXX3XdAcEqPYZOKzVjukRoPgfj30KYfe1XHWyhH4Rvc2dp2JF0d7f_6M8PkHYcejIRrJIsM5gSFVzdre0LqHHwUZQQmWR15gnShM8sKQ/w640-h406/v1.jpg" width="640" /></a></span></div><span style="line-height: 115%;"><br /></span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Thank up guys<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">See you in the next class.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: medium;"> </span></o:p></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: medium;">Online basic electronics
classes now available here. Get feedback from student who has completed the
course <a href="http://www.humtechelectronicschool.com/2021/04/feedback-from-students-who-have.html">here</a>.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: medium;"> </span></o:p></span></p>
<p class="MsoNormal"><span style="font-size: medium;"><span style="line-height: 115%;"><o:p><span style="font-family: verdana;"> </span></o:p></span><b style="font-family: verdana;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></span></p>
<p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-4720225073973345762022-03-24T12:47:00.001+03:002022-03-24T12:47:16.852+03:0014 inch JVC CRT television model AV-14FMG3B hit by power surge now repaired.<p><span style="font-family: Arial, "sans-serif"; font-size: 14pt;">I was visiting a client, who wanted her television checked
by a technician; she has left a message to her neighbor who has a shop on the
same block to direct me to her house.</span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">Once I reached the shop, I introduced myself and my
mission there, while talking to the lady another client of mine whom I have
repaired<span style="mso-spacerun: yes;"> </span>his television previously passed
by and as we greeted each he mentioned that I really helped him to revive his
dead television.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">The shop owner heard the conversation and was interested
to see if I can revive her television which was hit by power surge and decided
to keep it in the store.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I proceeded to my mission and while coming back I found the
lady has already picked the television from the store waiting for me.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I opened the television and since it was hit by power
surge I was much interested on the power supply which always super heavy
casualties once hit by power surge.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">First I checked the state of the main capacitor and found
its top part lightly swollen.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">With this I concluded indeed this was power surge, sorry I
did not take a photo before removal from the board.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkW7UNzsK2rUGEos2H-dnDEnbNArqm6QAdP7tuoSgtdTojY0IBT0GcMJdnI5FWzaWB6x5dc6M7kfADR3YYzzEK9q9Llbxd67TPw3Qqn6M78Ynm1kJvmKcIX0Znxxmpx4911BFBqOXlkcZFUJe-f2okiiaSVnSYEsLaE_rCkieG0kjDoAYCaXy8EG55TQ/s622/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="403" data-original-width="622" height="414" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkW7UNzsK2rUGEos2H-dnDEnbNArqm6QAdP7tuoSgtdTojY0IBT0GcMJdnI5FWzaWB6x5dc6M7kfADR3YYzzEK9q9Llbxd67TPw3Qqn6M78Ynm1kJvmKcIX0Znxxmpx4911BFBqOXlkcZFUJe-f2okiiaSVnSYEsLaE_rCkieG0kjDoAYCaXy8EG55TQ/w640-h414/v1.jpg" width="640" /></a></div><span style="font-family: Arial, "sans-serif"; font-size: 14pt;"><span><a name='more'></a></span>Next I checked the health of other safety components and
found the fuse was okay to my surprise, checked the surge limiter and found its
open which means it succumbed before the fuse.</span><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwgoY0qhaGlivRhiOd7_FURNDTXHNrLRZT86aaebxLsNbeUnrLDMm4aXT_lEQXzkdYx8DO1he7llzJjebCjSeDuoGCJu00Ge8UtGVk4nCeVurowS68XyyGxy7BUIztMtgIWVLKDysXjRdVKUtOuC5L1oEOaSIZm2DMcTXeQF1SrJwwm6q7fJwbfOgyHw/s626/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="406" data-original-width="626" height="416" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwgoY0qhaGlivRhiOd7_FURNDTXHNrLRZT86aaebxLsNbeUnrLDMm4aXT_lEQXzkdYx8DO1he7llzJjebCjSeDuoGCJu00Ge8UtGVk4nCeVurowS68XyyGxy7BUIztMtgIWVLKDysXjRdVKUtOuC5L1oEOaSIZm2DMcTXeQF1SrJwwm6q7fJwbfOgyHw/w640-h416/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I tested the bridge diode using my digital meter and
found its okay, after changing these two components I decided to apply the
power using the <a href="http://humphreykimathi.com/new2.php">series current
limiter</a> and noted the bulb was shinning like the sun even after<span style="mso-spacerun: yes;"> </span>one minute, with this I concluded there is a
still a shorted(s) component on the power supply.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I tested the voltage across the bridge diode middle pins
(ac pins) and found the voltage was quite low. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I decided to replace the diode bridge directly and see if
it was failing under load since I had already tested it using the meter and
tested good.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">After replacing the bridge diode I noted the voltage is
now normal and the voltage on the secondary side was also present, the B+
voltage was also present and stable, but the TV could not fire, No High voltage.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">The power on Led was also blinking and this leads me to conclude
I am not out of the wood.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I pulled my ESR meter and begin testing the secondary
output filter capacitors starting with the lines which I noted the voltage was dancing
a lot for lack of better word.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I bumped on capacitor C945 rated 1000uF/25 volts which in
circuit ESR reading was around 3 ohms, I decided to remove it out of circuit
and test again using multi-components tester and this is what I got.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWmmh6fxqRvl-qVZ3LFiEtWnNvwzuol7JF4953mZU7-ca4Pi03xNznPE2WdW5Ed5UVWaWBn-JelU7Y1QxJkgYeILo2Gdx3OhcncFtdbfseKuZsy4OLyyvrlR_VVMJLRim25cdZGQKzENc-n1gRCsotpNmleSQXM1SO2SDuCM7VevQ3usMujsoWa0j-gg/s597/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="597" data-original-width="496" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWmmh6fxqRvl-qVZ3LFiEtWnNvwzuol7JF4953mZU7-ca4Pi03xNznPE2WdW5Ed5UVWaWBn-JelU7Y1QxJkgYeILo2Gdx3OhcncFtdbfseKuZsy4OLyyvrlR_VVMJLRim25cdZGQKzENc-n1gRCsotpNmleSQXM1SO2SDuCM7VevQ3usMujsoWa0j-gg/w532-h640/v1.jpg" width="532" /></a></div><p></p><p class="MsoNormal"><span style="font-family: Arial, "sans-serif"; font-size: 14pt;">ESR of 14 ohms and capacitance has dropped by half not
forgetting the V-losses.</span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">I replaced this capacitor and again tested the effects of
that and I was happy with what I saw.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">The TV is now up and running <o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgez37GVcwE3nobsEl1eBPKwNAIplSWmF79XE2fVav8Uk2lRFmBC1OGEnWdMY3kH4BQsCwSAGwOeC0D7mF4jE4u9KGWOpIObff3bz057aOo3KyBHM4_ZMlcFLMJHM2TtS8-pTPuXkIfN4xW5CUTQGNQLYm_Eanu5_d8Ac1L88THzcRiuAdiWMVSil0ZPg/s514/v1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="371" data-original-width="514" height="462" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgez37GVcwE3nobsEl1eBPKwNAIplSWmF79XE2fVav8Uk2lRFmBC1OGEnWdMY3kH4BQsCwSAGwOeC0D7mF4jE4u9KGWOpIObff3bz057aOo3KyBHM4_ZMlcFLMJHM2TtS8-pTPuXkIfN4xW5CUTQGNQLYm_Eanu5_d8Ac1L88THzcRiuAdiWMVSil0ZPg/w640-h462/v1.jpg" width="640" /></a></div><span style="font-family: Arial, "sans-serif"; font-size: 14pt;"> </span><p></p><p class="MsoNormal"><span style="font-family: Arial, "sans-serif"; font-size: 14pt;">T</span><span style="font-family: Arial, "sans-serif"; font-size: 14pt;">hank you guys</span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">See you on the next class<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;">Online classes on basic electronic course going on <a href="https://humtechelectronicschool.blogspot.com/">here</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;"><o:p> </o:p></span><b style="font-family: verdana; font-size: x-large;"><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Arial","sans-serif"; font-size: 14.0pt; line-height: 115%;"><o:p> </o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com3tag:blogger.com,1999:blog-1120987647049297737.post-86625059516476773242022-03-11T10:11:00.005+03:002022-03-11T10:15:38.407+03:00Von Hotpoint microwave model HMG-202DB with “no heating problem” now repaired.<p><span style="font-family: verdana; font-size: large;">I received this microwave from my neighbor who wanted it
checked by a technician.</span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">The owner told me that there was a loud bang and since that
time they set it aside (store) and were planning to buy another one since they
considered the issue as beyond repair.</span></span></p><p class="MsoNormal"><span style="font-size: x-large;"><span style="font-family: verdana;">I took it with me to my shop and once I applied the power I noted
it was powering on well, I placed a glass full of water and hit express button
and after 30 seconds I checked the water and found it was still cold.</span></span></p><p class="MsoNormal"><span style="font-size: x-large;"><span style="font-family: verdana;">I then decided to open up the machine and do some
troubleshooting.</span></span></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgFx03NFLP8SyOH_wDtgkb0Wm5l1LXTxb7byX3gBvMm_M-r4igBvS2eyg___SNnwLPgagWAgZX9qrUh3eZ8oHJkgJx-RCn-j7pnlj4OGzs3SuscM9nKj7gxYU53NZq-VzgUYXfmZymDrwdU9mhaY30uv1os2_SBz4KZ9O3ArsC_FL0w8OfecPN9Rvm1gA=s527" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="527" data-original-width="497" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEgFx03NFLP8SyOH_wDtgkb0Wm5l1LXTxb7byX3gBvMm_M-r4igBvS2eyg___SNnwLPgagWAgZX9qrUh3eZ8oHJkgJx-RCn-j7pnlj4OGzs3SuscM9nKj7gxYU53NZq-VzgUYXfmZymDrwdU9mhaY30uv1os2_SBz4KZ9O3ArsC_FL0w8OfecPN9Rvm1gA=w604-h640" width="604" /></a></span></div><p></p><p class="MsoNormal"><span><span style="font-family: verdana; font-size: large;"></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: large;">I begin testing the H.V fuse and found its
okay, next I checked the H.V diode and found it dead short.</span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Next I checked H.V capacitor with my multicomponent tester and found it okay as you can see the results below.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjy0HTY_T3kqW7RneSpSxvpdeboi4OCn6WaDtl6Az3dRAn74rtxmvGORC2yjkjzeqWlOaiMNLXiUKYmrEgqxhymuGe9tUovpJb4AFl3ebInYi_JClGH2bKCma4XySdGaqX-C9hYd248F7oODazjlQSCFstG84kGiOoTbhGwZlEpNBROvATPy19V9H-5vg=s505" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="342" data-original-width="505" height="434" src="https://blogger.googleusercontent.com/img/a/AVvXsEjy0HTY_T3kqW7RneSpSxvpdeboi4OCn6WaDtl6Az3dRAn74rtxmvGORC2yjkjzeqWlOaiMNLXiUKYmrEgqxhymuGe9tUovpJb4AFl3ebInYi_JClGH2bKCma4XySdGaqX-C9hYd248F7oODazjlQSCFstG84kGiOoTbhGwZlEpNBROvATPy19V9H-5vg=w640-h434" width="640" /></span></a></div><span style="font-family: verdana; font-size: large;"><br /></span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I replaced the HV diode which was found faulty and tested
again with a glass of water and after 30 seconds, I found the water was a
little warm. <o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I decided to check the H.V diode again and found it once again
shorted.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Before replacing the diode again, I decided to replace the
magnetron directly.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjjVq3xp0hSeAtPxgBHaLjDQuRNJCtSiLPtX11_HhPhDk8JkUe1YN7WSAmohiF1ojRChHMOT4XdfHAB8QpDeuzQurVXX2KlZ-AwhethU1HFktgzdC1JeYabB7m35uxfiUZEmA2Kr7m7MSux53tzi17uRdZo_w_16dEsX1FpNSinOfTHJKAt7-3aOZkOaA=s503" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="503" data-original-width="495" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEjjVq3xp0hSeAtPxgBHaLjDQuRNJCtSiLPtX11_HhPhDk8JkUe1YN7WSAmohiF1ojRChHMOT4XdfHAB8QpDeuzQurVXX2KlZ-AwhethU1HFktgzdC1JeYabB7m35uxfiUZEmA2Kr7m7MSux53tzi17uRdZo_w_16dEsX1FpNSinOfTHJKAt7-3aOZkOaA=w630-h640" width="630" /></span></a></div><span style="font-family: verdana; font-size: large;">I replaced the two components and after testing again with a
glass of water, I found the microwave was now working like new.</span><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhdsf0Xximj432fTMVRtNDxuPUz9RW4i_BHMXl3bMQRmIA_lJP_JHoB39iLsFg6hT9MsaUMzUG53QX4EPJwWSXZZgGChCntuXnrBWVQod0Ii-oTn4I9JXaZ7XdWllbZ-LsH-0I3Lb_CmE40fEV4UX0AUqncClPG484v3v7KznhaEKe-LBt1PmigDkqX9Q=s628" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="400" data-original-width="628" height="408" src="https://blogger.googleusercontent.com/img/a/AVvXsEhdsf0Xximj432fTMVRtNDxuPUz9RW4i_BHMXl3bMQRmIA_lJP_JHoB39iLsFg6hT9MsaUMzUG53QX4EPJwWSXZZgGChCntuXnrBWVQod0Ii-oTn4I9JXaZ7XdWllbZ-LsH-0I3Lb_CmE40fEV4UX0AUqncClPG484v3v7KznhaEKe-LBt1PmigDkqX9Q=w640-h408" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Thank you guys<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">See you in the next class<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%;"><o:p><b><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></o:p></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com2tag:blogger.com,1999:blog-1120987647049297737.post-67314941494863367052022-01-31T14:48:00.004+03:002022-01-31T16:54:50.133+03:00Von hotpoint 2.0 Channel Surround speakers model HA160200 inputs not responding(stuck) now repaired<p><span style="font-family: verdana; font-size: large;"> <span><span>I </span><span>received</span><span> this machine from my </span><span>neighbor</span><span> who wanted it checked by a technician.</span></span></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">The<span style="mso-spacerun: yes;"> </span>complaints was machine has no response from
the inputs keys, Non was working.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEh8toP1JSmzbfMIIJXsIFWPkra9N_qjePpL_JahT4gFiKy6n91u-A8JMvtVkwPf_Kwd2FyQxKkoAylWywY8W3TNY8iFVGKf5lYGm1liAWXA5nU8Tq3FVNancb3e_dC8GrOu74DsyT5JMwqCgy_3q10EmwDfWJSOiwVIK9-9Zo-iuDCq07JEqfJCIgbQqg=s798" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="580" data-original-width="798" height="465" src="https://blogger.googleusercontent.com/img/a/AVvXsEh8toP1JSmzbfMIIJXsIFWPkra9N_qjePpL_JahT4gFiKy6n91u-A8JMvtVkwPf_Kwd2FyQxKkoAylWywY8W3TNY8iFVGKf5lYGm1liAWXA5nU8Tq3FVNancb3e_dC8GrOu74DsyT5JMwqCgy_3q10EmwDfWJSOiwVIK9-9Zo-iuDCq07JEqfJCIgbQqg=w640-h465" width="640" /></a></div><p></p><div class="separator" style="clear: both; text-align: center;"><br /></div><span style="font-family: verdana; font-size: large;">I
took the machine with me to the workshop and upon opening it I scanned the
board and I could not see any area which looked suspects in terms of stress or
blackened as you can see below.</span><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhoQ2E0cY4IC7nKGpLa-kH5uTS6ieVOHCt4aatIDHTQH8y-F5GVaBIyGAYk6RyoK4_c_-ve3K9RSsCSIVevHwn0QWBGj8z9VSlaho3HlHICaP74GcIvDW0fevUIpxpe0jpWIvOUhlqmO3CbbDicwITHULOnRSzjmN0pBtlazwaiJsHird7iQ7SzWe0JWQ=s628" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="421" data-original-width="628" height="430" src="https://blogger.googleusercontent.com/img/a/AVvXsEhoQ2E0cY4IC7nKGpLa-kH5uTS6ieVOHCt4aatIDHTQH8y-F5GVaBIyGAYk6RyoK4_c_-ve3K9RSsCSIVevHwn0QWBGj8z9VSlaho3HlHICaP74GcIvDW0fevUIpxpe0jpWIvOUhlqmO3CbbDicwITHULOnRSzjmN0pBtlazwaiJsHird7iQ7SzWe0JWQ=w640-h430" width="640" /></span></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;"><span style="font-family: verdana; font-size: large;"></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: large;">I
did some voltage testing and everything looked good.<o:p></o:p></span><p></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">I decided
check the small circuit board which control the inputs.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">Accessing
this circuit was not easy since the manufacturer decided not to make it
accessible easily, no screws or hooks, just used the hot melt glue to fix the
thing together.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">Very
unfortunate considering the customers has invested quite substantial amount of
money but the quality was poor as you can see below.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEj0LvHEVnIM5zH4Lprn5uEglUOk__z-JZMPXmCWeQZnJqD7zLj_Ghr5Iv9D3bEsDLK9wqB4prfmwjsewJOSZXOpKA3-vQc1J-yhVd31FKrGjYMBoSQ6S7yUD_vSLKs14eV_o0fx_uFoSBm9AAinEWR0NU308RX78ZCy7G6pluQJw990lYKJBP-W14gq3Q=s603" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="603" data-original-width="459" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEj0LvHEVnIM5zH4Lprn5uEglUOk__z-JZMPXmCWeQZnJqD7zLj_Ghr5Iv9D3bEsDLK9wqB4prfmwjsewJOSZXOpKA3-vQc1J-yhVd31FKrGjYMBoSQ6S7yUD_vSLKs14eV_o0fx_uFoSBm9AAinEWR0NU308RX78ZCy7G6pluQJw990lYKJBP-W14gq3Q=w488-h640" width="488" /></span></a></div><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Once the small input module was out of the machine I again did some scanning and I noted
a resistor with one leg broken right at the resistor body and therefore
soldering it back together was not possible.</span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;">So I
replaced it with another resistor with the same value which I got from my
resistor repair kit.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgy6LiEqzEfD6rd1xNvS4n8IIcgvRjK-K3-egU_y_ZLI6KQYTojoWoS7jAH_85R4SRp8mttDHFqfjMQgarpOPO0E4YqhxILNjZEhxHrrsIBlxxOvAV3aYptFTy6Ya5kXpSdBYEetLDqAkXwHCtnnXVTkEKQBKTanXEb_ngbju3hFZw-YrcjoXyBOgFueg=s657" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="657" data-original-width="498" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEgy6LiEqzEfD6rd1xNvS4n8IIcgvRjK-K3-egU_y_ZLI6KQYTojoWoS7jAH_85R4SRp8mttDHFqfjMQgarpOPO0E4YqhxILNjZEhxHrrsIBlxxOvAV3aYptFTy6Ya5kXpSdBYEetLDqAkXwHCtnnXVTkEKQBKTanXEb_ngbju3hFZw-YrcjoXyBOgFueg=w486-h640" width="486" /></span></a></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><span>More
scanning revealed break on the pcb track and I sorted the broken track with a
wire jumper as you see</span><span> </span><span>below.</span></span></p>
<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjkA6ac7jn_ESWfl0lzyWVGdUAZrrYH6wJqRFSZVnpMSKe7yf4NI_cbRZ0jAk6q9L4z48WyK5ni1YaoxqKyZyK6WUbQCETmd2ySmMIl3hZtEwHUDF74lVmyFBLn04FcjT3dG-wk95kuBtBgqOTzsdGR4RH3QgnyWK3MlN2MGh71f-ykMtHNFwKUT3hukg=s569" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="569" data-original-width="424" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEjkA6ac7jn_ESWfl0lzyWVGdUAZrrYH6wJqRFSZVnpMSKe7yf4NI_cbRZ0jAk6q9L4z48WyK5ni1YaoxqKyZyK6WUbQCETmd2ySmMIl3hZtEwHUDF74lVmyFBLn04FcjT3dG-wk95kuBtBgqOTzsdGR4RH3QgnyWK3MlN2MGh71f-ykMtHNFwKUT3hukg=w476-h640" width="476" /></span></a></div><p class="MsoNormal" style="line-height: normal; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;"><span style="font-family: verdana; font-size: large;"><span face=""Arial Black","sans-serif"" lang="EN" style="color: black; mso-ansi-language: EN; mso-bidi-font-family: "Arial Black";"><o:p> </o:p></span><span>After
replacing the resistor and fixing the broken track, I decided to apply the
power and to my surprise the problem was shorted.</span></span></p><p class="MsoNormal" style="line-height: normal; margin-bottom: 0cm; mso-layout-grid-align: none; text-autospace: none;"><span style="font-family: verdana; font-size: large;"></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><span style="text-align: left;"><b><i>Big
problem, simple solution.</i></b></span></span></div><p></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><br /></span></p><p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"><b><span>Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB">here</a><span> or Contact us on +254 733 475 040</span></b></span></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large; line-height: 115%; mso-bidi-font-size: 11.0pt; mso-no-proof: yes;"><o:p> </o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-33334360139789438522021-12-07T14:49:00.002+03:002021-12-07T16:39:49.531+03:0043 inch Hisense television hit by power surge now repaired<p><span style="font-family: verdana; font-size: large;">I was sitting in my shop working when I heard a loud
bang and then power in my shop went off.</span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I went outside and noted some people near my shop
pointing where the bang came from, Power transformer has blown.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Being a weekend the power was not restored until
Monday, coming back to my shop I passed by a shop nearby and the shopkeeper told me the power was restored back but most of his
items were dead.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Among them was power supply for his kerosene pump, I
went to my shop and did some testing, luckily only my laptop was plugged to
power outlet by the time of power purge.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I checked it out and noted it was dead as dodo, that
a story for another day.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">A few minutes later I received a phone call from my
landlord, complaints was that his TV has not worked since the day of the power
surge.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Being month end and I had to pay bills including
rent, I decided to treat this as urgent, I went to his house, picked up the
television and brought it to the workshop for repairs.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Upon opening the television I went straight to the
safety components starting with the main fuse which as you can below it was
open.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgSHHC_UFvlka5-K9kfhJ-kW26vuzLUt-Sf3iaWAoJt2rGoYR6h6AOmBcnacN8BaK6xl1V-1RbIIDEpRpfqDiO8jDWIF4kq9YaUcyayr5xCSXI8aNj59Law7AkqfDX1nVtecq_pq7naC5vl-tWTZnU7ZPb0SMr2ytdunUOF046RLroD6DLG8GujchsuPw=s548" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="548" data-original-width="355" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEgSHHC_UFvlka5-K9kfhJ-kW26vuzLUt-Sf3iaWAoJt2rGoYR6h6AOmBcnacN8BaK6xl1V-1RbIIDEpRpfqDiO8jDWIF4kq9YaUcyayr5xCSXI8aNj59Law7AkqfDX1nVtecq_pq7naC5vl-tWTZnU7ZPb0SMr2ytdunUOF046RLroD6DLG8GujchsuPw=w414-h640" width="414" /></a></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"><span></span></span></p><a name='more'></a><span style="font-family: verdana; font-size: x-large;">The black mark across the fuse pins indicates the
fuse died a painful dead and therefore expected a heavy short ahead.</span><p></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Next I checked the status of the switching Mosfet(TK14G65W)
and was found<span style="mso-spacerun: yes;"> </span>okay, this brought a smile
on my face since getting this fet in my market it’s not easy, I usually import
and therefore take 3 to 4 weeks.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Since the switching fet was found okay, we can
safely assume the control ic is also okay, from my experience, when this fet
short, does not go alone, usually cause the control ic to short also.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjU67cTlOY_lgkL5w0gDylQfg_vllSVkcA97f9gHJH8UvQXvscqYlMA44FhF-yPAPySjYBdWrX4OrU6MWbBGces9G85vtoJ6KWp0AX9_4qLRLmIJVzyMCDUiSMV79v6Oxqi7Fi92vsgckgEKueUBFhvpDy7W3IeYAgKQMuqmL1zQz2M3T3Kyo7BPHoocg=s471" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="471" data-original-width="407" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEjU67cTlOY_lgkL5w0gDylQfg_vllSVkcA97f9gHJH8UvQXvscqYlMA44FhF-yPAPySjYBdWrX4OrU6MWbBGces9G85vtoJ6KWp0AX9_4qLRLmIJVzyMCDUiSMV79v6Oxqi7Fi92vsgckgEKueUBFhvpDy7W3IeYAgKQMuqmL1zQz2M3T3Kyo7BPHoocg=w554-h640" width="554" /></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I continued scanning and noted the main filter
capacitor has its top silvery part swollen, this is an indication of effect of
high voltage surge, the capacitor was rated 100uF/450v, here in Kenya we use
240 Vac and therefore we should expect around 320 to 339 volts DC at the main
capacitor.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I decided to replace the two components, fuse and
the main capacitor and see the effect of that, I decided to use the series
current bulb current limiter and I noted the bulb was very bright even after
one minute.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I decided to continue with troubleshooting and noted
the voltage at the main capacitor was very low.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I switched off the power and tested the rectifier
diode and found two are dead short.<o:p></o:p></span></span></p><p class="MsoNormal"><span style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEjaxF9vtu0mPadhgK8QbO_5tD0JzjE7Fsb6E9EqAh-Q5L4kVeZkCuFSqWkY2Fn-y4ASQpHsR36sm7ZKcMG4DdXaaQB8Rd4YlcfwgJJ4YF4F4iyO76zByDAIjMPlYPeEdTxdgkCyMIXArsZ5oPOZcflQ43epnzRNg8ecslzotUOfKymclvJORgFXLPraFg=s474" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="474" data-original-width="409" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEjaxF9vtu0mPadhgK8QbO_5tD0JzjE7Fsb6E9EqAh-Q5L4kVeZkCuFSqWkY2Fn-y4ASQpHsR36sm7ZKcMG4DdXaaQB8Rd4YlcfwgJJ4YF4F4iyO76zByDAIjMPlYPeEdTxdgkCyMIXArsZ5oPOZcflQ43epnzRNg8ecslzotUOfKymclvJORgFXLPraFg=w552-h640" width="552" /></a></div><p></p><p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I replaced all the four diode and again applied the
power using the series bulb, this time the bulb came up brightly and then dim.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">With that I concluded that no more shorted component
and therefore I can apply the power without the current limiter bulb.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;">I did the same and the machine came up beautifully</span></p>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgJMNWCkTJyFD2coUcDwRKOKjBG9fGhvC-aIbEYNqbFLzzbx3H4_nf0n0EwuHPX4HrHIQ_uCOui3Q_GxfjDaPYvMPLZyCYQFFfR6pVi_F97qoEeQjeB6ir2UrU29Z_keAoDtds3B9AlMr-7WaDKWvqMAjJ5bIg8V3XgZWvCT5V66q0LS8gRXaaADobHeg=s626" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="386" data-original-width="626" height="394" src="https://blogger.googleusercontent.com/img/a/AVvXsEgJMNWCkTJyFD2coUcDwRKOKjBG9fGhvC-aIbEYNqbFLzzbx3H4_nf0n0EwuHPX4HrHIQ_uCOui3Q_GxfjDaPYvMPLZyCYQFFfR6pVi_F97qoEeQjeB6ir2UrU29Z_keAoDtds3B9AlMr-7WaDKWvqMAjJ5bIg8V3XgZWvCT5V66q0LS8gRXaaADobHeg=w640-h394" width="640" /></a></span></div><span style="font-family: verdana; font-size: large;"><br /></span><p></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"> </span><span style="font-family: verdana; font-size: x-large;"> </span><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;"> or Contact us on +254 733 475 040</span></p><div class="separator" style="clear: both; text-align: center;"><br /></div>
<p class="MsoNormal"><span style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-4739158175953852782021-11-08T14:05:00.005+03:002021-11-19T11:08:38.113+03:00Clubox woofer producing Humming Noise now repaired!<p> <span style="font-size: 16pt;">I received this woofer from a customer who wanted it checked by a technician.</span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">He hinted that the woofer was from another technician who was not able to repair it.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">Items from other technician are tricky to repair especially if the tech had limited knowledge on how circuit works, they ends up making so much experiments and guess works and therefore chances of repair is quite low.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">Nonetheless I decided to have a try and see if I can help this customer who seemed desperate to see his machine back to normal status.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">After opening the set I found the main filter capacitor rated 470uF/25V has its top part swollen.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">From the symptoms at hand the failure of this capacitor fits so well and I was very confident this was one of the easy fix.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I pulled a replacement capacitor from my capacitor kit quickly and decided to do test and the machine came up beautifully.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEj9nlQ29iCsgEr3b6DqCygQ-TEaGGswDG-fpiYSxv_rso009xX0OIIdM-RdwqE8zg7hYNNuRgiV5bBiJtxLvgcaMh4wfRd_HbcFk9EuIGrdvLZnGJx6XO1Sovmd-Yqz4-OO2ppQzn6tvNmtazFjwiTKbVB6g4U6a7_AkmUGV2rgizaiMcOIW9soxa6DTg=s568" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="568" data-original-width="493" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEj9nlQ29iCsgEr3b6DqCygQ-TEaGGswDG-fpiYSxv_rso009xX0OIIdM-RdwqE8zg7hYNNuRgiV5bBiJtxLvgcaMh4wfRd_HbcFk9EuIGrdvLZnGJx6XO1Sovmd-Yqz4-OO2ppQzn6tvNmtazFjwiTKbVB6g4U6a7_AkmUGV2rgizaiMcOIW9soxa6DTg=w556-h640" width="556" /></a></div><p></p><p class="MsoNormal"><span></span></p><a name='more'></a><p></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I decided to continue listening the soothing music from the machine as I continued with other repairs.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">After about 30 minutes, the humming sound was back, I decided to open the set and see if the same capacitor has failed again.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I noted the capacitor was still holding strong, no signs of stress and decided to use touch method to pick up any component which may be overheating.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I started with the audio I.C and found it extremely hot, I suspected it instantly but continued with my touching method and placing my finger on top of the main filter capacitor which I have just replaced also found it very hot, touched the bridge rectifier and also found it un usually hot.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I decided to change the Audio I.C directly but before that I decided to power the woofer one more using the DC power supply since the woofer was using due power(AC and DC).<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I run the machine for nearly one hour and this time that machine was running cool, all components.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">This made me rule out all the suspected components, Looking closely at the transformer connector I noted it has some burnt marks and was not happy with this, I suspected the transformer is failing under load and to confirm this I decided to run the machine again for 30 minutes and feel the state of this transformer, after running the machine for 30 minutes, I touched the transformer and found it un usually hot.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I decided to do direct replacement but since I did not have this part in my workshop I decided to go buy one in town.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEgRuvQM0aV2hoqQb33LnbEz2IJJBFgutCbEWox4VWYlpmAWYdeQU5F6TM1aVpmRXsCXU4fSEM9k8fHy8ZvG2GhFyZIwksHM1prPyHDfuykrg_2ez5gOg67Ll5HSwq4wYn5x7pc8K74Rwjen4HPkFQmuubL8NP_qx-a4Kl_pBXH5R69RQSiKznfe56JmHQ=s606" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="606" data-original-width="503" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEgRuvQM0aV2hoqQb33LnbEz2IJJBFgutCbEWox4VWYlpmAWYdeQU5F6TM1aVpmRXsCXU4fSEM9k8fHy8ZvG2GhFyZIwksHM1prPyHDfuykrg_2ez5gOg67Ll5HSwq4wYn5x7pc8K74Rwjen4HPkFQmuubL8NP_qx-a4Kl_pBXH5R69RQSiKznfe56JmHQ=w532-h640" width="532" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 16pt;">I replaced the transformer with a new one and again run the machine for one hour and the machine was still working well.</span></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;">I again did the touching process and all components were running cool.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/a/AVvXsEhYgf0AYAbBR5X_3kYHww5OwKM3pX0urvR3GYpswLZTiazkqleFhoLx2W0y6LvaCVqoNYkkgFAm5wTi65e-bRDcmFOhjUE8hLLwCeG5XgjMbehkUc8LjJ3J0aR4oHodon01g1ROfUOFO_lf3Cgo-zm5Mmdg39VUGbmt_FBOcN1iLpGCqd8ZQ-XkGHsv3w=s483" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="483" data-original-width="477" height="640" src="https://blogger.googleusercontent.com/img/a/AVvXsEhYgf0AYAbBR5X_3kYHww5OwKM3pX0urvR3GYpswLZTiazkqleFhoLx2W0y6LvaCVqoNYkkgFAm5wTi65e-bRDcmFOhjUE8hLLwCeG5XgjMbehkUc8LjJ3J0aR4oHodon01g1ROfUOFO_lf3Cgo-zm5Mmdg39VUGbmt_FBOcN1iLpGCqd8ZQ-XkGHsv3w=w632-h640" width="632" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;"> or Contact us on +254 733 475 040</span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="434" src="https://blogger.googleusercontent.com/img/a/AVvXsEip2cJqezMLLDWZ9Hi2Kzzzfc7KVL4PHJh9rPwpvFDZ0TwPYR_d_ofh3BfaqH-9tzHQXMGZANDRnixju9Ac-gYtA0tYXla79nXsCwDNt83h6c-zj_k4PwMQ_92HHqFM1UrotZzA4hSjr6eXvKdQHnSSlZ5BHLvjrWTIYdxEUvSer3n98sCy_bo4EwrgcA=w640-h434" width="640" /></a></div><br /><p></p><p class="MsoNormal"><span style="font-size: 16pt; line-height: 24.5333px;"> </span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com3tag:blogger.com,1999:blog-1120987647049297737.post-19136457248340407512021-09-14T08:19:00.003+03:002021-11-08T14:39:08.436+03:00TLS woofer came in with low audio output now repaired<p> </p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFGhmLDtE3IqzWipDIoYkiEFdKi9bp3j4YBOOAVIZ2YJFA1-wTiLwvH6VsDboSqufKTNFM78NYwSsyR2fPC-AVWDeDo2KoGlLJD3bHhHV3WvaGIcNQ4RrDLSX0vIgdrOuvfWcmGDuixZ0w/s570/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="570" data-original-width="491" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFGhmLDtE3IqzWipDIoYkiEFdKi9bp3j4YBOOAVIZ2YJFA1-wTiLwvH6VsDboSqufKTNFM78NYwSsyR2fPC-AVWDeDo2KoGlLJD3bHhHV3WvaGIcNQ4RrDLSX0vIgdrOuvfWcmGDuixZ0w/w552-h640/v1.jpg" width="552" /></a></div><br />
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">I received this woofer from a client who wanted it
checked by a technician.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">According to her the woofer no base but the rest
is working well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">I did the test to confirm what she said and noted the
woofer symptoms were different from what she gave. The actual symptom was low
audio output.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;"><span></span></span></p><a name='more'></a><span style="font-size: large;">I opened the woofer and this is what I saw.</span><o:p></o:p><p></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6M54M7d6mqWkx1exyHj76THUiNot0NGWilaI3LGEcu86R1zmxqWYlo_uYrjRRt5vB4RSgyfaDhpUhGBRl3y2DWXv_CvbP-eBDdEM_KWzEaCsPSZSe48-95ufEiCJ34MWvRhkbMDLEVFUe/s535/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="486" data-original-width="535" height="582" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6M54M7d6mqWkx1exyHj76THUiNot0NGWilaI3LGEcu86R1zmxqWYlo_uYrjRRt5vB4RSgyfaDhpUhGBRl3y2DWXv_CvbP-eBDdEM_KWzEaCsPSZSe48-95ufEiCJ34MWvRhkbMDLEVFUe/w640-h582/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%; mso-no-proof: yes;">Once opening the woofer and did
some scanning, I noted an area with dark burnt marks, in electronics dark area
on the board are signs of stress.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhM7ME7U-jsC0DfJ36HSe2Hh3U48mqZNS_Dq-Iu2Z1oi3M_bL9CFje44ErehVmc8YYIJH-m6x4qPIjFeq_qSEtLIBQfZUuJuNgfF5xaml0NNncNisF95QruPM5AiVdVXtqOmAihh_D-fVRV/s624/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="459" data-original-width="624" height="470" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhM7ME7U-jsC0DfJ36HSe2Hh3U48mqZNS_Dq-Iu2Z1oi3M_bL9CFje44ErehVmc8YYIJH-m6x4qPIjFeq_qSEtLIBQfZUuJuNgfF5xaml0NNncNisF95QruPM5AiVdVXtqOmAihh_D-fVRV/w640-h470/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">Turned the both the other side and noted a
resistor has been fixed across the burn marks, this is a low value resistor and
therefore was acting as a fuse.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1to9LcVe6Mt4DSOQJv-IFMEyKzN0POPjXV0MZCIG2jNnhstxptQojM9o5JuA76QvAHf3VN-_DyRKgmf8S_Kw5uM82cAe4xTPOX8x7XydKRZD53myBWWQ2l0y0yZHLH1HV2hMAkMXNCBim/s624/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="464" data-original-width="624" height="476" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1to9LcVe6Mt4DSOQJv-IFMEyKzN0POPjXV0MZCIG2jNnhstxptQojM9o5JuA76QvAHf3VN-_DyRKgmf8S_Kw5uM82cAe4xTPOX8x7XydKRZD53myBWWQ2l0y0yZHLH1HV2hMAkMXNCBim/w640-h476/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style", serif; font-size: 16pt;">Next I followed that line and lead me to the
amplifier i.c. Tda7379.</span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">I tested the voltage on one pin of this resistor
and noted it was fluctuating, I removed one pin from the circuit and the
voltage went up, this lead me to conclude that the amplifier ic has some
internal injuries and needed replacement.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">I went to town looking for this part and got the
part effortlessly.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">I replaced the i.c and after applying the power, I
noted the machine was restored back to normal.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKoSUX7OwU0BahXtQGpkOLnVsgsCraEBA88HkD8FYWmL6zw7lzd7Ap-1yXvuB1G3FHH6VPf1OwHfEvgWInbPfKrA9l91LShWecGTWclUOQnhAAwk3ojuQh2lWSGEMrEqX_dA6OMT0_diHm/s624/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="458" data-original-width="624" height="470" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKoSUX7OwU0BahXtQGpkOLnVsgsCraEBA88HkD8FYWmL6zw7lzd7Ap-1yXvuB1G3FHH6VPf1OwHfEvgWInbPfKrA9l91LShWecGTWclUOQnhAAwk3ojuQh2lWSGEMrEqX_dA6OMT0_diHm/w640-h470/v1.jpg" width="640" /></a></div><br /><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;"><br /></span><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 115%;">Visit our Nairobi office <a href="https://g.co/kgs/SrmTbB">here</a> or Contact us on +254 733 475 040</span></p>
<div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="434" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIhFQ8a0FpgEMwVCQ51gS9tO9rkP7GTOQYKb9hf1J5Rsf-rwD9076b1SJq6AxQTydyBAcSEXWQCXp385rH-U4Nauvt0M3B8s8ZX1_BpRK195xrEE2Cu3h6Bjz6-e7jnj_QB4eMcxqeipCr/w640-h434/map.jpg" width="640" /></a></div><br /><p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-44482599139824765702021-08-25T17:58:00.001+03:002021-11-19T11:05:43.928+03:0049 inch LG led television model (49UJ634V) with backlight problem now repaired.<p> <span style="font-family: "Bookman Old Style", serif; font-size: 15pt;">I received a whatsups message from a neighbor with
the following image taken from his television screen and wanted me to advice
him about the issue.</span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">As you can see from the image the top part is
dark, from the screen shot I suspected backlight failure but was to confirm
since from experience if one backlight fails for branded television like LG I expect
the protection circuit to kick in and shut down the television.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPUZqI2wqZ8oYEIhXgQw6SMYWXL2eDbMgUKlDbHFrcqZqXhjCiIAG2JK2V478IQDHanZ4ue13nvEVBU9VdmUssZ11bDlQRXFdorpNv8VQTs1-cFRhHAz1POQYavLW1B3UA0GCM5T7I7FVm/s537/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="338" data-original-width="537" height="402" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPUZqI2wqZ8oYEIhXgQw6SMYWXL2eDbMgUKlDbHFrcqZqXhjCiIAG2JK2V478IQDHanZ4ue13nvEVBU9VdmUssZ11bDlQRXFdorpNv8VQTs1-cFRhHAz1POQYavLW1B3UA0GCM5T7I7FVm/w640-h402/v1.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;"><span></span></span></p><a name='more'></a>The following day I went to the site and was shown
the television and I decided to open it up and confirm my hypothesis.<o:p></o:p><p></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style", serif; font-size: 15pt;">After opening so many screws I was able to access
the inside of the television as you can see below.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIfnx5YvWEGLu66yvvm0eZT7jZyzF_8fAAX5f9HHGlQa7DYBGvaTP5VU9NIbUDz102JV9DOcMg6PLNIvfzQQqqJ4PeqAsjcsZKz_z9PCfL16cvkzwS7Z4qVJLnJSQxkWwh02FHUnB6zAeH/s463/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="463" data-original-width="412" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhIfnx5YvWEGLu66yvvm0eZT7jZyzF_8fAAX5f9HHGlQa7DYBGvaTP5VU9NIbUDz102JV9DOcMg6PLNIvfzQQqqJ4PeqAsjcsZKz_z9PCfL16cvkzwS7Z4qVJLnJSQxkWwh02FHUnB6zAeH/w570-h640/v1.jpg" width="570" /></a></div><p></p><p align="center" class="MsoNormal" style="text-align: center;"><br /></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">I pulled my led backlight tester and tested the
two pins of led connector and noted the voltage was very low, with that I concluded
backlight failure and the next move is to remove the screen (panel) in order to
access the backlight.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">Accessing led backlight is a delicate affair, I am
not going into details since I have done that in my book <a href="https://www.lcd-ledtelevisionrepairguide.com/2019/03/lcdled-television-repair-case-history.html">LED
repair case history volume1</a>, where I have given a step by step guide on how
to replace led backlight like a professional without breaking the panel.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">After removing the panel/screen, I was now able to
access the diffusers as you can see below.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE56FMeGt8HFtnPGPJ4Y6CJKWV3l9QdouOebg0XQU9j5IOD0lwqXaYLY7dsgHAGY4TSvoqHrbFU5G5Jf0xQjeFSxbkNVKM5yRNozVW7ORWV7IemafLqiqmuWmEKtt9w_j4tVwGA3O08Jf1/s400/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="400" data-original-width="399" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE56FMeGt8HFtnPGPJ4Y6CJKWV3l9QdouOebg0XQU9j5IOD0lwqXaYLY7dsgHAGY4TSvoqHrbFU5G5Jf0xQjeFSxbkNVKM5yRNozVW7ORWV7IemafLqiqmuWmEKtt9w_j4tVwGA3O08Jf1/w638-h640/v1.jpg" width="638" /></a></div><br /><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;"><br /></span><p></p><p align="center" class="MsoNormal" style="text-align: center;"><span style="font-family: "Bookman Old Style", serif; font-size: 15pt; text-align: left;">Next is the reflector as you can see below.</span></p><p align="center" class="MsoNormal" style="text-align: center;"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQKTXpKC2oMjOcA9f0qmmGwdwCJpaCBDJGR7yyK-5_bBHSBopQ21fTdzx6qtJwTHnduGsMAjHi8WF1PPlTOhFZE2ME1onqXv835014m_Y9aKOliWTJ8Mm3SEpgBZNyUZ5rmHEFKVxuEcV4/s460/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="460" data-original-width="396" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQKTXpKC2oMjOcA9f0qmmGwdwCJpaCBDJGR7yyK-5_bBHSBopQ21fTdzx6qtJwTHnduGsMAjHi8WF1PPlTOhFZE2ME1onqXv835014m_Y9aKOliWTJ8Mm3SEpgBZNyUZ5rmHEFKVxuEcV4/w550-h640/v1.jpg" width="550" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><span style="font-family: "Bookman Old Style", serif; font-size: 15pt; text-align: left;">And finally the backlights, I tested each strip
and only one strip was working out of four strips, kindly note that for the 49
inch LG each strip has two strip left and right and therefore total number of
strips in this television is eight pieces.</span><p></p><p align="center" class="MsoNormal" style="text-align: center;"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmhuJxOsAHgrRh5Y8vvKg9hg-O80POyKpvoHSOtZ1N4lAcOqwiCTTDCMVhjxKz5_PZkuXZiSY0OQKgHzx-GuyGM7OXslPtuCAbrEkm6QaOJO314CJCK-vMoMlNEEHsQcrI8ABGYo5GKG9P/s507/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="507" data-original-width="387" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmhuJxOsAHgrRh5Y8vvKg9hg-O80POyKpvoHSOtZ1N4lAcOqwiCTTDCMVhjxKz5_PZkuXZiSY0OQKgHzx-GuyGM7OXslPtuCAbrEkm6QaOJO314CJCK-vMoMlNEEHsQcrI8ABGYo5GKG9P/w488-h640/v1.jpg" width="488" /></a></div><p align="center" class="MsoNormal" style="text-align: center;"><br /></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">With the sample led strip I went to the shop and
bought the whole sets of eight pieces including the one which was working since
as you know leds used in backlight have life span which is usually 4 to 5
years.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">According to the owner the television was already
over 5 years and therefore changing all backlight at the same time was prudent
idea to avoid call back.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;">If you what to learn more about backlight see this
article <a href="https://www.electronicsrepairmadeasy.com/2021/07/led-television-backlight-replacement.html">here</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;"> or Contact us on +254 733 475 040</span></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 15pt; line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="217" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCCpBqrpsRp0U91HpxtyFh5UeD1zePY868izre8Cmnh-MXirZQepF1BK6FgmSJZzomkNnlltiRU0skN9UxAxGIh2epECcU0hcCtCZy8XDW4b_Prbir7tk8aNRjipRYExr6Bvmr-K5I4x1P/s320/map.jpg" width="320" /></a></div><br /><o:p><br /></o:p><p></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-76650135899714892202021-08-12T14:08:00.006+03:002021-11-19T11:07:58.236+03:0049 inch KONKA Led television came in with power related problem now repaired.<p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style", serif; font-size: 16pt;">I received a phone call from a client who wanted
his television checked by a technician.</span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">The symptoms were, Television is powering on then
shutting down after 20 to 30 minutes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">When the television shut down, the audio remains
but no picture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">Since I could not figure out the real cause of this
symptom from the description given on phone, I requested him to bring the television
to the shop for further testing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">Within one hour he was at my shop credits to Google
map which does great job in directing customers to my shop.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">Once on my work bench I decided not to test what
the customer said since I figured out taking a whole 20 minutes waiting for the
symptoms to present is waste of time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">I opened the television and after removing the
cover my eyes caught the attention of one capacitor which had its top silver
part slightly swollen as you can see below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;"><v:shapetype coordsize="21600,21600" filled="f" id="_x0000_t75" o:preferrelative="t" o:spt="75" path="m@4@5l@4@11@9@11@9@5xe" stroked="f">
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<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;"><o:p> </o:p></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXgVXODyMrX-zyF6gm2KbVJypNf77pystPIjO_ZkQRbeczAXhZmV62pLX-GnH27z77jmGD4uD5vsEAk3W-qYrAwCZdzfJ39SKdwKhgNV9wTv8bwb4GyqrM4xf5B_oQC5I_MQ3d0NFL_KEg/s531/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="531" data-original-width="477" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXgVXODyMrX-zyF6gm2KbVJypNf77pystPIjO_ZkQRbeczAXhZmV62pLX-GnH27z77jmGD4uD5vsEAk3W-qYrAwCZdzfJ39SKdwKhgNV9wTv8bwb4GyqrM4xf5B_oQC5I_MQ3d0NFL_KEg/w574-h640/v1.jpg" width="574" /></a></div><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;"><o:p> <span></span></o:p></span></p><a name='more'></a><span style="font-family: "Bookman Old Style", serif; font-size: 16pt;">The capacitor was rated 33uF/200V</span><p></p>
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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghpH8o1Z8up5bhJlh-EW0RpDx9RqIyNc3INTTKWtMplL6-E1nQI2OAcB5gBILzX20z8bv-ssIyyNlHB02PsXWU5qWfLLXUxKyre74zMW3GfkwVjEM84MZDd7Kw0F9fPemE1JGwpaIV96g-/s539/v2.jpg" style="font-family: "Bookman Old Style", serif; font-size: 16pt; margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="539" data-original-width="368" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghpH8o1Z8up5bhJlh-EW0RpDx9RqIyNc3INTTKWtMplL6-E1nQI2OAcB5gBILzX20z8bv-ssIyyNlHB02PsXWU5qWfLLXUxKyre74zMW3GfkwVjEM84MZDd7Kw0F9fPemE1JGwpaIV96g-/w436-h640/v2.jpg" width="436" /></a></div><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;"><o:p> <br /><span style="font-family: "Bookman Old Style", serif; font-size: 16pt;">Looking at the capacitor you will see that it is
located on the LED backlight drive circuit and this can cause the television to
behave as the customer complaints were.</span></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">I decided to replace the capacitor with 33uF/400
Volts instead of 33uF/200 volts since the symptoms presented by this capacitor
was failure due to high voltage.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">I replaced the capacitor and the television came
up beautifully.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;">I tested it for two hours non stop and the issue
of shutting down never presented again and this lead me to conclude the television
has now been restored back to factory setting.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4EYZavkJOKYPpRsVxExi5SNes-l9f6G7rAC3ZOzf-gUy24PZg6mjiIdcuv4Jfo8v80ZJUPlxrjmBTrLv953p-xKFO1_mlsu7O3JthyoMZQzA-Y1Ovukr0f_Oi66Rr3nlOCsSX0KZ6VdqU/s463/v3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="364" data-original-width="463" height="315" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4EYZavkJOKYPpRsVxExi5SNes-l9f6G7rAC3ZOzf-gUy24PZg6mjiIdcuv4Jfo8v80ZJUPlxrjmBTrLv953p-xKFO1_mlsu7O3JthyoMZQzA-Y1Ovukr0f_Oi66Rr3nlOCsSX0KZ6VdqU/w400-h315/v3.jpg" width="400" /></a></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;"> or Contact us on +254 733 475 040</span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="281" data-original-width="415" height="271" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRunfp8CpwspIns_wWM7dPtmavaBU-CrjSPd854v_B9SXie7Xnis5vioYqbHduJDmk8O1OxdMW4nKhLMV9mjWus3rotE0VNPv3vg7ZZk5-EP31Y0yNY0axayeBi1M9KIsXFAFg9cRY1Hka/w400-h271/map.jpg" width="400" /></a></div><p class="MsoNormal"><span style="font-family: "Bookman Old Style","serif"; font-size: 16pt; line-height: 107%;"><o:p> </o:p></span></p><br />Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com2tag:blogger.com,1999:blog-1120987647049297737.post-47814590015635815282021-07-26T10:56:00.003+03:002021-07-26T11:49:28.264+03:00Understanding home theater Channels<p><span style="font-family: verdana; font-size: large;">Most people have problem in understanding home theater channels, in this article i am going to shed some light on the same.</span></p><p><span style="font-family: verdana; font-size: large;">Sometimes we see home theaters written 5.1, 7.1, 5.1.2 and so
on.</span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">What does this mean? </span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">This refers to channels; you may think
of channels as speakers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">❖<span style="mso-tab-count: 1;"> </span>Old stereo
system is now referred to as 2.0(2 channels or 2 speakers)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">❖<span style="mso-tab-count: 1;"> </span>2.1 has 2
speakers and 1 subwoofer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">❖<span style="mso-tab-count: 1;"> </span>7.1 has 7
speakers and 1 subwoofer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">❖<span style="mso-tab-count: 1;"> </span>5.1.2 has
5 speakers,1 subwoofer and 2 dolby atmos speakers<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Dolby Atmos speakers- where we place 2 or more speakers on
the ceiling, now we are talking of 3D sound, where any sound can hover at any
point in space.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Example: 7.2.1 has 3 speakers in front, 2 at the sides, 2 at
the rear of the room and 2 in the ceiling and 1 subwoofer at the back (can be
placed anywhere).</span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><br /></span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Learn how to repair home theaters all model <a href="https://www.lcd-ledtelevisionrepairguide.com/2021/06/home-theater-repair-guide.html">here</a>.</span></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><br /></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://www.lcd-ledtelevisionrepairguide.com/2021/06/home-theater-repair-guide.html" style="margin-left: 1em; margin-right: 1em;"><span style="font-family: verdana; font-size: large;"><img border="0" data-original-height="310" data-original-width="252" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9x6baSpf53gwSxrhIVOc5_c9tIYJezhvXVuukRMBuUYCSLaEr6qo812fWie07xJEBmW6oGE4I9SgVFGXyriVvw3xgX_8tgMbkMSyBu2JXvcZSUYmrtNU0Ca5TI6C94xZF8fdKMpRaCqcZ/s0/HT+COVER+FINAL.jpg" /></span></a></div><div class="separator" style="clear: both; text-align: left;"><p class="MsoNormal"><span style="color: #2b00fe;"><b><i><span style="font-family: verdana; font-size: large;">For those visiting from Kenya our office direction is <a href="https://g.co/kgs/SrmTbB" style="color: #cc3300; text-decoration-line: none;">here</a></span></i></b></span></p><p class="MsoNormal"><span style="color: #2b00fe;"><b><span style="font-family: verdana; font-size: large;"><br /></span></b></span></p><p class="MsoNormal"><span style="color: #2b00fe;"><span style="font-family: verdana; font-size: large;"></span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="434" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHLBxU2qG1VnPCgE72VzCiSpFpStVNLWxk7ujovHNDPWsXCPrLlohzU64NaawUT9wJyUvzOtpo0glu5Ta8vo2TnPb3ZURh7TveYSEeAr6wp7_CDZaeTJIK3O95pRdFWUFpkiCbPp_rlaud/w640-h434/map.jpg" width="640" /></a></span></div><p></p></div><p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com0tag:blogger.com,1999:blog-1120987647049297737.post-15214985071881224072021-07-14T13:07:00.004+03:002021-11-19T11:09:03.032+03:0032 inch SONY LED television model 32R420B dead, red lights blinks 6 times now repaired<p> <span style="font-size: 18pt;">I received a phone call from a friend who wanted his
television checked by a technician; I scheduled him the appointment and he
logged in our office the following day.</span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">First I wanted to confirm the symptoms he has given me before
opening the television in his presence.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">I noted the screen was trying to display but shutdown
immediately.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">After 30 seconds I noted the red light will start blinking, I
decided to count the number of blinks and noted they were 6 blinks, 3 second
break, and then start again.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMc6kfEdSPj9oOojrAhGV8KeTl4_PB3oSEAu09rAo3g6KFttgUr2b2-cUlCfVuJYow8qMMzMVNWlVW-Hy9CnpTtWNWuv2v-IbhjTtyVCyJA3hyphenhyphenaQi6JdNkmLq3qF_twO7Zg2YDLWs0bUVo/s626/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="385" data-original-width="626" height="394" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMc6kfEdSPj9oOojrAhGV8KeTl4_PB3oSEAu09rAo3g6KFttgUr2b2-cUlCfVuJYow8qMMzMVNWlVW-Hy9CnpTtWNWuv2v-IbhjTtyVCyJA3hyphenhyphenaQi6JdNkmLq3qF_twO7Zg2YDLWs0bUVo/w640-h394/v1.jpg" width="640" /></a></div><span style="font-size: 18pt;"><span><a name='more'></a></span>From my experience 6 times blinks in Sony TV are usually
caused by backlights failure, therefore I had to open to confirm if indeed it is
the backlight or something else.</span><p></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">Opening LED television is a delicate affair and therefore
care must be taken not to break the screen/Panel and cause more damage to the
machine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">If you are new to LED televisions you may consider looking at
this book <a href="https://www.lcd-ledtelevisionrepairguide.com/2019/03/lcdled-television-repair-case-history.html">here</a>
for detail on explanation how to access television backlight like a
professional.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaJVb2tLzjv7lEFchYmk7-Z0WPYr1XCMnN0QasFNJJvj4a0rXR9JKzT3W9vS6_GQVNturdBl03dsiJld8Z-LC7hUrkKTD-0iAIGfICE9gUG2cs7nC7T20tTlN834NU5nsXLGOEwyi_geur/s628/v2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="304" data-original-width="628" height="310" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaJVb2tLzjv7lEFchYmk7-Z0WPYr1XCMnN0QasFNJJvj4a0rXR9JKzT3W9vS6_GQVNturdBl03dsiJld8Z-LC7hUrkKTD-0iAIGfICE9gUG2cs7nC7T20tTlN834NU5nsXLGOEwyi_geur/w640-h310/v2.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">Upon accessing the backlight, I did the testing using my LED
television backlight tester and got the results above on the 3 strips.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">From the figures above you can see V1 has reading way up from
the other two strips, also note that only7/8 LEDs were on and therefore need
replacements.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">LED have a lifespan and therefore whenever I find one strip
or one led bead faulty I always change complete set to avoid customer coming
back again with the same problem. This is particularly true with Sony
televisions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 18pt; line-height: 115%; mso-bidi-font-size: 11.0pt;">I went to the shop, bought the backlight, replaced and here is
the final result.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFUha9AUO9P10s_z3Ba0asJ_Z2yNpVaisPqKlMhrIXkvqhT6l2XhDd2tk2HcejyZKsTf5kduu2xG4iJxA6Ao1kJnztb57Qcf9LV6WnYwbWzmcJwH9TCNJq25QnzLuEmDrj-3BijfLt61te/s453/v3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="277" data-original-width="453" height="392" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFUha9AUO9P10s_z3Ba0asJ_Z2yNpVaisPqKlMhrIXkvqhT6l2XhDd2tk2HcejyZKsTf5kduu2xG4iJxA6Ao1kJnztb57Qcf9LV6WnYwbWzmcJwH9TCNJq25QnzLuEmDrj-3BijfLt61te/w640-h392/v3.jpg" width="640" /></a></div><br /><p></p><p class="MsoNormal"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;"> or Contact us on +254 733 475 040</span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="271" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQ5rqPgFF8-2k0h-FCvHOPoCxDP5AaFmZPBEjYHVCcTCKzScmhhHab2PHJo9HrvYC5PqcKbwZNfnuYW6ExI4Ag2MOfsz4AQrjvTZRTpuWDnuOQV3NE0lzD31Hquya1Bm-8NR1nK4WGvhvI/w400-h271/map.jpg" width="400" /></a></div><br /><p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com2tag:blogger.com,1999:blog-1120987647049297737.post-82422735905862194912021-07-06T19:33:00.005+03:002021-12-07T14:52:35.191+03:00LED television backlight replacement<p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">LED backlights have a lifespan, for branded tvs like Sony,
LG, Samsung etc they go up to 5 years without issues.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">But other brands most start developing backlight issues
after 2 years is common.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Kindly note that LED backlight are connected in “series”,
this means if only one piece is open, the whole set will stop working.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">If one led get shorted the tv will continue working but
there will be overload to the remaining LEDs and therefore it will be a matter
of time before the remaining leds fail and if any of them open, again the
television will loss picture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">From experience, I have seen the best cure for backlights is
changing all backlights at the same time to avoid customer coming back with the
same problem after a few days or weeks. This is particularly notorious with
Sony televisions.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"><b><i><span></span></i></b></span></p><a name='more'></a><span style="font-family: verdana; font-size: x-large;"><b><i>Symptoms of failed backlights</i></b><o:p></o:p></span><p></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><b><span style="color: #2b00fe;">a)Dim
picture</span><o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Children are very good at seeing these symptoms, you can
also use a torch to flash on the TV screen and if you see any image means the
backlight have failed and need replacement.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><b><span style="color: #2b00fe;">b)Screen
dark on one side</span><o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">This is common with LG and Samsung Tvs which use two strips
(high voltage) type<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: #2b00fe; font-family: verdana; font-size: large;"><b>c)Red
lights blinking 6 times (6X)<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">This is usually the case with Sony TVs, Sony TVs has inbuilt
error code, in case of backlight failure the tv red light blinks 6 times, pause
for three seconds and then continue with the 6 blinks again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"><b><span style="color: #2b00fe;">d)Sound but no picture</span></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">This symptoms is also common in TVs without over voltage
protection inbuilt, under normal circumstance, any failure in the backlight
system will cause the television to shutdown.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"><span style="color: #2b00fe;"><b>e)Blue tint</b></span></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">This is a rare symptom of backlight failure but do happen <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana;"><b><span style="font-size: x-large;">Cost of backlight replacement</span></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Like I said backlight age together and therefore I recommend
changing all backlight at the same time.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: #2b00fe; font-family: verdana; font-size: large;"><b>a)Television
model <o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Different tvs use different types of led backlights and
hence the cost will vary even if the tv size is the same but different models.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: #2b00fe; font-family: verdana; font-size: large;"><b>b)Types of the LED strips<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Led strips come in different types and hence the price also
varies.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;"><span style="color: #2b00fe;"><b>c)Size of the television</b></span></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Big size television use more strips and therefore cost will
be high.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana;"><b><span style="font-size: x-large;">Replacing the backlights</span></b></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Replacing the backlight is the most delicate assignment
since you are to remove the screen/panel to access the backlights.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">The screen is very fragile and a small error can cause a huge
damage especially if the screen is broken, the price of the Led tv screen is usually
2/3 of the a new tv and therefore care must be taken.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">To that end I have written a book on how to replace
backlights like a professional without breaking the screen.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><b>Here a preview of my book selling <a href="https://www.lcd-ledtelevisionrepairguide.com/2019/03/lcdled-television-repair-case-history.html">here</a>.</b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;">First remove the bezel and the screen slowly and carefully
and place it on a flat surface preferably with a soft material on the top.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi40LlV5Cwn4IWAErRnzJfE4o1bHDVrmXT_1K-Sr_itB6mSQ7-vzG3rOnlBKPr4QfBdZw2gd07TNPHT57ERzTVql6iRfeXj0EI3iB52f91YcwGOJpXUC9CmnpGGM5thIqTGYi6tK7TYrBy9/s628/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="292" data-original-width="628" height="298" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi40LlV5Cwn4IWAErRnzJfE4o1bHDVrmXT_1K-Sr_itB6mSQ7-vzG3rOnlBKPr4QfBdZw2gd07TNPHT57ERzTVql6iRfeXj0EI3iB52f91YcwGOJpXUC9CmnpGGM5thIqTGYi6tK7TYrBy9/w640-h298/v1.jpg" width="640" /></a></span></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;">Next remove the diffuser plate and place them on top of the
screen because when reassembling you will be doing the reverse.</span></p><p class="MsoNormal"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0D-ffa1VnDyAamm24e2xxPAgfbt7jzM7r6WxOAN5D-BQDP1q-AJc6kmceQ6I3qYpvDe6NbBbZxBYVlfTOmFkhIaPES7ucrmybBfWYMsY97lRp5-CELjbF8UzELZSHUloKHeDBFn4muw_n/s454/v1.jpg" style="font-family: verdana; font-size: x-large; margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="403" data-original-width="454" height="568" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0D-ffa1VnDyAamm24e2xxPAgfbt7jzM7r6WxOAN5D-BQDP1q-AJc6kmceQ6I3qYpvDe6NbBbZxBYVlfTOmFkhIaPES7ucrmybBfWYMsY97lRp5-CELjbF8UzELZSHUloKHeDBFn4muw_n/w640-h568/v1.jpg" width="640" /></a></p><p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;">Now you can access the led backlight strip with reflectors
at the bottom.</span><span style="font-family: verdana; font-size: x-large;"> </span></p><p class="MsoNormal"><o:p><span style="font-family: verdana; font-size: large;"></span></o:p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzQVJGuxVfZjo5mzDy3tpUarXS0vI7ZnIwyd31Mz5TpypGJinPXXUW3iFHgb748XAh4hzf7i_uKmcNKV_9ScMEd1-ru1EUppHmbt6lGzK6QaE0_NRimoN6w0xB9hH715RqOZwjEsOb_1t6/s466/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="466" data-original-width="442" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzQVJGuxVfZjo5mzDy3tpUarXS0vI7ZnIwyd31Mz5TpypGJinPXXUW3iFHgb748XAh4hzf7i_uKmcNKV_9ScMEd1-ru1EUppHmbt6lGzK6QaE0_NRimoN6w0xB9hH715RqOZwjEsOb_1t6/w608-h640/v1.jpg" width="608" /></a></span></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">Remove the reflectors by removing the clips shown below
though type of these clips depend on the television model.</span></p><p class="MsoNormal"><o:p><span style="font-family: verdana; font-size: large;"></span></o:p></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOO2vUMyEcSD9vhDcJdfWvIFDNbHYByHApXxBhmfALgvOuNMr1unah0tJT44RFv-0ustKJTvvlO0Sp2WOpbeBRN7tu4A62_E1QmaJ3rpGOiy8gjZJeADFx9LevsMFIWiJtYhLG6IKxZ0FN/s623/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="623" data-original-width="467" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOO2vUMyEcSD9vhDcJdfWvIFDNbHYByHApXxBhmfALgvOuNMr1unah0tJT44RFv-0ustKJTvvlO0Sp2WOpbeBRN7tu4A62_E1QmaJ3rpGOiy8gjZJeADFx9LevsMFIWiJtYhLG6IKxZ0FN/w480-h640/v1.jpg" width="480" /></a></span></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><span style="mso-spacerun: yes;"> </span></span><span style="font-family: verdana; font-size: x-large;">Now you can access the led strips</span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><span style="mso-spacerun: yes;"> </span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLgfsxoDLBB3Ix-qs7RpkuvGD7TNAqYhKVkKlE3N3pwEe9bbf3AShEGutGT4voeMT3Ubk3YjW4IEqESAhAf38Dk8ROo5l2YyqDZOBjVOi8THOJM1FUwvEK_Vccxh7_1dRuE9kDXjGVOIt5/s503/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="503" data-original-width="453" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgLgfsxoDLBB3Ix-qs7RpkuvGD7TNAqYhKVkKlE3N3pwEe9bbf3AShEGutGT4voeMT3Ubk3YjW4IEqESAhAf38Dk8ROo5l2YyqDZOBjVOi8THOJM1FUwvEK_Vccxh7_1dRuE9kDXjGVOIt5/w576-h640/v1.jpg" width="576" /></a></span></div><p></p><p class="MsoNormal"><span style="font-family: verdana; font-size: large;">and you are ready to test them and the best tester for these
is the led backlight tester shown below.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: verdana; font-size: large;"><span style="mso-spacerun: yes;"> </span></span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-family: verdana; font-size: large;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq18vOLdRKAU9Lo4nM_9fHshpLytKG6Ebk1bDoE3jM64YSL6zxQ7Vcsfm6-jy9EW7lXcNAVvqFzSY3apYbis-jJ_YHLSifn9jTk_lux6b8SeYS3qyVRzW6Tp66dX_RNX18qSvTPypGKbut/s622/v1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="622" data-original-width="359" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhq18vOLdRKAU9Lo4nM_9fHshpLytKG6Ebk1bDoE3jM64YSL6zxQ7Vcsfm6-jy9EW7lXcNAVvqFzSY3apYbis-jJ_YHLSifn9jTk_lux6b8SeYS3qyVRzW6Tp66dX_RNX18qSvTPypGKbut/w370-h640/v1.jpg" width="370" /></a></span></div><p class="MsoNormal"><span style="font-family: verdana; font-size: x-large;">You may decide to test one strip at a time or the whole
branch.</span></p><div class="separator" style="clear: both; text-align: center;"><span style="font-size: large;"><span style="font-family: "Bookman Old Style", "serif"; text-align: left;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; text-align: left;">here</a><span style="font-family: "Bookman Old Style", "serif"; text-align: left;"> or Contact us on +254 733 475 040</span></span></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://g.co/kgs/SrmTbB" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="281" data-original-width="415" height="434" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObuMKB_Wh-_5zmcTIPDa7RHKIxW4vmP6OdcdboOY36mCsL4O5mCwZhQl5sYVMRc38sgotdBPbJ28Jqg6QpveHZWJmiy9bExE5OTZoIxqqGUu5kAFcTQK5aYBJgF595vAjxgowBg-CLMEm/w640-h434/map.jpg" width="640" /></a></div><br />Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com4tag:blogger.com,1999:blog-1120987647049297737.post-40316410903425478172021-06-20T08:51:00.003+03:002021-11-19T11:09:57.690+03:00Daewoo microwave oven model KOC-9Q5T came in dead now repaired.<p><span style="font-family: verdana; font-size: large;"> I got a direct message on my Facebook account from a
client who wanted her microwave checked by a technician.</span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I gave her my pin location and within an hour she was
at my shop via uber.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">First I wanted to confirm what the customer said was
the symptoms of making noise while warming food but realized the machine was
totally dead.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I opened the oven and went straight to the main fuse and
found it there but next to it was a huge jumper wire which was also open.<o:p></o:p></span></span></p><p class="MsoNormal"><span lang="EN" style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLqMPbkyLcpUdWtO5eH-kMdWx037zjs3VO91f0OFKWpVUiKeEmT-hDqxKVPBaW2hNWfvChEezrwDsfjATJ0qqFj3fpZv1d9ZgQATjwOJQoDF43sP4xUmZnid4e-BcC2Nm4BqDVwC6Gz-Cg/s543/m1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="543" data-original-width="445" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLqMPbkyLcpUdWtO5eH-kMdWx037zjs3VO91f0OFKWpVUiKeEmT-hDqxKVPBaW2hNWfvChEezrwDsfjATJ0qqFj3fpZv1d9ZgQATjwOJQoDF43sP4xUmZnid4e-BcC2Nm4BqDVwC6Gz-Cg/w524-h640/m1.jpg" width="524" /></a></div><span style="font-family: verdana; font-size: x-large;"><span><a name='more'></a></span> </span><p></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">With that I concluded there must be a big short ahead
and the mostly likely culprits are the switches or the control board.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">Usually microwave have three switches as you can see
here below.<o:p></o:p></span></span></p><p class="MsoNormal"><span lang="EN" style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQXpczgHSfgwHgmiv0De0PenglViMGCrQff1iQosPWfo4mt9XwCXqcClCbjvN7ZWI1fTNedbChcpRORl2tTD20LpIpA41JmMca1lVg6xXuwU4cfNPbunFqxRGTeZL7VHQvC-_AWqKkw7AT/s563/m2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="526" data-original-width="563" height="598" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQXpczgHSfgwHgmiv0De0PenglViMGCrQff1iQosPWfo4mt9XwCXqcClCbjvN7ZWI1fTNedbChcpRORl2tTD20LpIpA41JmMca1lVg6xXuwU4cfNPbunFqxRGTeZL7VHQvC-_AWqKkw7AT/w640-h598/m2.jpg" width="640" /></a></div><p></p><p class="MsoNormal" style="text-align: justify;"><span style="font-family: verdana; font-size: x-large;">We have the primary, monitor
and secondary switch, all have different functions as outlined in my latest
book on microwave repair eBook sold </span><a href="https://www.lcd-ledtelevisionrepairguide.com/2021/04/microwave-oven-repair-made-easy.html" style="font-family: verdana; font-size: x-large;">here</a><span style="font-family: verdana; font-size: x-large;">.</span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I tested all the switches
using my digital meter and all passed the test with flying colors.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I had already disconnected
the high voltage circuit and therefore I was sure the problem was on the
control board or the switches.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I checked the control board
components and everything looked okay according to my meter.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">The customer was still
around and very keen and was getting frustrated that her machine may not have
another chance to live.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I decided to replace the
switches one by one and see if there will be any hope.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I begin with the middle one
which is called the monitor switch and after replacing still the problem was
not solved.<o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="font-family: verdana; font-size: large;">I changed the upper switch
or the primary switch and still no change and finally decided to change the
lower secondary or door switch and to my surprise the short was gone and the
machine could now power up.<o:p></o:p></span></span></p><p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7-hCxOgrcFOrVIzEMFqs-9Ox0D9cdyFeQ-JpY-ObyJWd0wJkp-RwF_RW2Br6ZrWf2sefcCVpeGT6-Xw8yzgC223a7Ou9sy7ifTzxb4yAXZ1d5DEae8fWQK8DfiRvtHfOaDR5Hg1QN3Lg-/s596/m3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="596" data-original-width="443" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7-hCxOgrcFOrVIzEMFqs-9Ox0D9cdyFeQ-JpY-ObyJWd0wJkp-RwF_RW2Br6ZrWf2sefcCVpeGT6-Xw8yzgC223a7Ou9sy7ifTzxb4yAXZ1d5DEae8fWQK8DfiRvtHfOaDR5Hg1QN3Lg-/w476-h640/m3.jpg" width="476" /></a></div><p></p><p class="MsoNormal" style="text-align: justify;"><span style="font-family: verdana; font-size: x-large;">During these testing I was
using my series current bulb limiter, I finally replaced the fuse with the
original fuse rated 15A and did a test with a cup of cold water and noted with
was now working.</span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><span style="color: #2b00fe; font-family: verdana; font-size: large;"><b><i>Note: when it comes to
testing microwave switches never trust your meter, just do direct replacement
and obviously not from a junk.</i></b><o:p></o:p></span></span></p><p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"></span></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijh2G5CZPXkJ9TFnCwJZXvqR0v-HbrJbFGboS6GYHiNBICrSZqpohyphenhyphenXq2lG0sPdvDDK8JqJpsuN1f1spkCSyrjqb51kdoQLhN6zESnuXxEOShBNh6OTbIx0lafQ8I8ySaigGdCDH_YdElF/s624/m4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="426" data-original-width="624" height="436" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijh2G5CZPXkJ9TFnCwJZXvqR0v-HbrJbFGboS6GYHiNBICrSZqpohyphenhyphenXq2lG0sPdvDDK8JqJpsuN1f1spkCSyrjqb51kdoQLhN6zESnuXxEOShBNh6OTbIx0lafQ8I8ySaigGdCDH_YdElF/w640-h436/m4.jpg" width="640" /></a></div><p></p><p class="MsoNormal" style="text-align: justify;"><span lang="EN" style="line-height: 115%;"><o:p><span style="font-family: verdana; font-size: large;"> </span></o:p></span></p>
<p class="MsoNormal" style="text-align: justify;"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px; text-align: left;"> or Contact us on +254 733 475 040</span></p><p class="MsoNormal" style="text-align: justify;"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com1tag:blogger.com,1999:blog-1120987647049297737.post-57228782063837432912021-06-13T08:19:00.002+03:002021-06-13T08:19:55.354+03:0014 inch LG CRT television dead now repaired.<p> <span style="font-size: 16pt;">I received this television from a customer with dead on
arrival symptoms, I checked the main fuse and found it okay.</span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I tested the HOT transistor and found it okay, next I pulled
my ESR meter and begin testing esr for all big filter capacitors on the
secondary side and bumped on one which has esr reading very high, actually
around 150 ohms.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">The capacitor was rated 47uF/160V, this is the capacitor
which filters the B+ voltage.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRu63q1jouS6LykXYWM8I5F7f5t9p9bUPIDttzSKFwmpRoz3h4nyHpWgK1KPF1Ex6XOcr6mZgipm3Z2ulr7HeNL8w5buesyoyqZceWIlZ-2DNvb2IPJYBd5OyQ44NeIRMzV8x9gRAzfbOn/s530/k1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="530" data-original-width="494" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRu63q1jouS6LykXYWM8I5F7f5t9p9bUPIDttzSKFwmpRoz3h4nyHpWgK1KPF1Ex6XOcr6mZgipm3Z2ulr7HeNL8w5buesyoyqZceWIlZ-2DNvb2IPJYBd5OyQ44NeIRMzV8x9gRAzfbOn/w596-h640/k1.jpg" width="596" /></a></div><span style="font-size: 16pt;"><span><a name='more'></a></span>After replacing this capacitor, I decided to power up the
machine and see the progress, noted the power on led is on but still no high
voltage was generated.</span><p></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I checked all the outputs voltages and all were stable, I followed
the B+ voltage and noted it was not present at the collector pin of HOT
transistor.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I followed it backward and found an open resistor R470, this
is a low value resistor which is used to monitor the Horizontal output circuit
for any short. <o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDBJsJb_zLEL41Tc8ulvMbPNnMQeycMVwSLpOKeGUSI7wdt_tC8hG6SnLK1gRfJ0usM8ePVUKBSEOJwOsVDAE8uxQxRYiU_o9Ib173byhuSxdG2KHKhfxLWEYDi3DBJb8M9LrbjvnSdnTm/s493/k2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="488" data-original-width="493" height="634" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDBJsJb_zLEL41Tc8ulvMbPNnMQeycMVwSLpOKeGUSI7wdt_tC8hG6SnLK1gRfJ0usM8ePVUKBSEOJwOsVDAE8uxQxRYiU_o9Ib173byhuSxdG2KHKhfxLWEYDi3DBJb8M9LrbjvnSdnTm/w640-h634/k2.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">In case there is a short on the B+ line it should open and
therefore I expected a shorted component a head and the most possible culprit
would be the HOT transistor which you remember I tested it and found it okay.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I replaced this resistor with thin wire and after applying
the power the wire went into flames.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;"><span style="mso-spacerun: yes;"> </span>I replaced with a
thicker wire and applying the power again using my series bulb current limiter
and was able to test the voltage and noted was very low and pulsating.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I removed the HOT transistor and noted the voltage is now
stable at 110V.<o:p></o:p></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWfOCRDE37T0lvK6Be3XvF2YRz3UeVIHtxgUiHNWgvN_Clz6iHbbyuytqCM44o0HTf61WeNTirH1wMPFaAXX7URefj6qO1dyJQzdtqN7p5-4x0T1QDJxhssBvS2TRn8GIj3h3PQVx3XZjw/s493/k3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="425" data-original-width="493" height="552" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWfOCRDE37T0lvK6Be3XvF2YRz3UeVIHtxgUiHNWgvN_Clz6iHbbyuytqCM44o0HTf61WeNTirH1wMPFaAXX7URefj6qO1dyJQzdtqN7p5-4x0T1QDJxhssBvS2TRn8GIj3h3PQVx3XZjw/w640-h552/k3.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 16pt;">I decided to test the HOT transistor using my multicomponent
tester and this is what I got.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7Zj0M0xI-oUr_yDy0t5wMw5oJ_fKbnElMcsCDTouVI6z76wOjvJ82WOUsFBKcCAyowEd6HBU2P7OBpyNeaHHybzd2fKAWi8jft77V5-sSwgxs3rPUqv9fLqUBSJzdY5ocQPw5rfzTNry8/s597/k4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="597" data-original-width="493" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7Zj0M0xI-oUr_yDy0t5wMw5oJ_fKbnElMcsCDTouVI6z76wOjvJ82WOUsFBKcCAyowEd6HBU2P7OBpyNeaHHybzd2fKAWi8jft77V5-sSwgxs3rPUqv9fLqUBSJzdY5ocQPw5rfzTNry8/w528-h640/k4.jpg" width="528" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 16pt;">The transistor is no longer a transistor but a resistor
according to the tester.</span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I replaced the transistor with another from the junk, applied
the power and I heard chaa Sound from the fly-back meaning the television was
now able to fire.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">I connected the television to the decoder and this is what I saw.<o:p></o:p></span></p><p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;"><br /></span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiNPiKJ_-tH991P15I0MafeQ14vuKS_n-tuvtLW8WSqBqnoqW0IZaf08tcBUJz9QtD75fa-878DfHFvCw1hKOjO4mtYwMWy1V8wtzqRKz9qL4xXW2bcFd5OiF9YdyucV0KQVLTlXuaLos8/s375/k5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="321" data-original-width="375" height="548" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiNPiKJ_-tH991P15I0MafeQ14vuKS_n-tuvtLW8WSqBqnoqW0IZaf08tcBUJz9QtD75fa-878DfHFvCw1hKOjO4mtYwMWy1V8wtzqRKz9qL4xXW2bcFd5OiF9YdyucV0KQVLTlXuaLos8/w640-h548/k5.jpg" width="640" /></a></div><br /><p></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">Thank you guys<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">See you in the next class.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;">Hum-tech electronics school online classes ongoing <a href="http://www.humtechelectronicschool.com/2021/04/basic-electronics-course-for-beginners.html">here</a>.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 16.0pt; line-height: 107%; mso-bidi-font-size: 11.0pt;"><o:p> </o:p></span></p>
<p class="MsoNormal"><br /></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com2tag:blogger.com,1999:blog-1120987647049297737.post-71412490751068853052021-06-03T12:06:00.002+03:002021-11-19T11:10:50.210+03:00LG home theater model LHD657 came in with S-protect symptoms now Repaired!<p> <span style="font-size: 14pt;">I
received this machine with the above symptoms in my shop a few days ago, I
opened the machine and went straight to the audio amplifier which from my
experience is the major cause of this error.</span></p><p></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEil2wjOQBmmCS6EBSWjZo0uBSXTPW7PZXr-qiLHnKv5YZF0PgFCBmxuPyyM1_IGHdFpfHJx0AfGSMwEJpzP0gn-DBtaWCW5WMLhwTY7uNf9ci1NRtbDmZ22NMRCL_SL0a-cXcp4bgrsra8J/s624/L1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="240" data-original-width="624" height="246" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEil2wjOQBmmCS6EBSWjZo0uBSXTPW7PZXr-qiLHnKv5YZF0PgFCBmxuPyyM1_IGHdFpfHJx0AfGSMwEJpzP0gn-DBtaWCW5WMLhwTY7uNf9ci1NRtbDmZ22NMRCL_SL0a-cXcp4bgrsra8J/w640-h246/L1.jpg" width="640" /></a></div><span style="font-size: 14pt;"><span><a name='more'></a></span>I
noted all audio I.Cs were running cool and therefore did not suspect them to be
the cause, I did thorough testing on the components around the audio amplifier
and i bumped on one smd transistor which was dead short.</span><p></p>
<p class="MsoNormal"><span style="font-size: 14pt;">The
transistor was labelled Q407(HY4C), from the data sheet I noted the transistor
was a PNP, getting it was not easy and therefore I decided to use an ordinary
transistor A1015.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgX7dT9T37QgokZEdaTwUfmu-m-odMsO1mgBUDCZ31ojrcjqOETDojbaT2TkFZw2Gs1qsCz8qKXlU8L8OGpTqpLcOcUXP7H1tWBw4LzbMZJQytvGyXWqJcBJZJRFs0Q-1SMVapf4C2ZI_ZM/s624/L2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="391" data-original-width="624" height="402" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgX7dT9T37QgokZEdaTwUfmu-m-odMsO1mgBUDCZ31ojrcjqOETDojbaT2TkFZw2Gs1qsCz8qKXlU8L8OGpTqpLcOcUXP7H1tWBw4LzbMZJQytvGyXWqJcBJZJRFs0Q-1SMVapf4C2ZI_ZM/w640-h402/L2.jpg" width="640" /></a></div><p></p><p class="MsoNormal"><span style="font-size: 14pt;">After
replacing the transistor, I powered the machine and the s-protect was gone, i
did intense testing and noted the new transistor was getting too hot and
therefore decided to use transistor B892 which has better specs.</span></p><p class="MsoNormal"></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGGbwyOnjQVHUCrNVK8ZncjqqF4wnHQ36Pjj7KxJfkXNopFww-G_BEBcc-jVoK1TeEf5i6q2xunsp30CN35oSrJC_ZT1pVHMKRI9bmjoOxHdhkFrreObn7iHjDmt4S4yJjUf1bRpsYVMnU/s591/L3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="591" data-original-width="479" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiGGbwyOnjQVHUCrNVK8ZncjqqF4wnHQ36Pjj7KxJfkXNopFww-G_BEBcc-jVoK1TeEf5i6q2xunsp30CN35oSrJC_ZT1pVHMKRI9bmjoOxHdhkFrreObn7iHjDmt4S4yJjUf1bRpsYVMnU/w518-h640/L3.jpg" width="518" /></a></div><p></p><p class="MsoNormal" style="text-align: center;"><br /></p>
<p class="MsoNormal"><span lang="EN" style="font-size: 14pt; line-height: 115%;">After
replacing it with a transistor B892, I tested the machine for thirty minutes
and the transistor was running cool.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">Visit our Nairobi office </span><a href="https://g.co/kgs/SrmTbB" style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;">here</a><span style="font-family: "Bookman Old Style", "serif"; font-size: 21.3333px;"> or Contact us on +254 733 475 040</span></p>
<p class="MsoNormal"><span lang="EN" style="font-size: 14pt; line-height: 115%;"><o:p> </o:p></span></p>Humphrey Mndakahttp://www.blogger.com/profile/11910022657325511431noreply@blogger.com4