Monday, December 17, 2012

Basic electronics question from a young tech from BALTIMORE MARYLAND-USA



Hi Humphrey

I purchased DVD PLAYER REPAIR I am new to this how do you use OHM METER  to find a short  or check for short on a S.M.P.S circuit board

THANK YOU

Hi Winston,
Thanks for buying my eBook and sorry for delay in coming back to you sir, regarding your question on testing for short you need to set your meter(digital meter) to diode test range and when you touch the two probes of your meter you should hear a beep(bell)

This is what you should expect when you have a short on a circuit or a component is shorted...some component are supposed to beep when tested this way when they are okay...a good example is the fuse...if the fuse is ok it should beep when tested on diode range test, also coils have low resistance and therefore you should expect a beep with them also.

With that little background let me answer your last question...how to test for short on a S.M.P.S  board...shorting on the circuit board is usually caused by components which break down and short across the power line( this means component has one leg on the positive(+ve) line and the other pin on the ground...when this component short this means it creates a direct link between the live and the ground and therefore the circuit will fail to work and even cause the fuse to blow.

In S.M.P.S power supply the main component that short includes, main capacitor, diodes, control ic or transistor...Usually testing across the main capacitor two pins with your meter will tell if there is a sorted component or not...if there is no short across this line the meter will beep shortly and then the beep disappears as the main capacitor charges and increase the resistance.

For more info on this and much more i recommend  this book on basic electronics course book


Kind regards- Humphrey 

Author DVD player repair guide




Friday, December 14, 2012

Excellent services by Utsource



I ordered some spares for a friend from UTsource and received the package this morning, parts received in time and to specification.

Indeed the world is flat when it comes to service delivery by these guys.  Anyone out there having problem getting spares? I recommend you try these guys…



For more info about the services they offer click on the pic below..


Friday, December 7, 2012

Feeback and a few questions from a newbie technician from Nigeria



Hi Humphrey, 
I have successfully downloaded your eBook and I started reading it, it was very important especially for us beginners.

Glad to note you have finally got the eBook and thanks for the feedback.