how to use lab power supply on checking short?

[tomrush]

i'm new to laptop repair and i want to know how to check shorted component using lab powersupply?
where should i connect the prods?
what specific components should i start touching if it's shorted/overheating?

thank you

[rievax_60]

Re: how to use lab power supply on checking short?

It is a deep topic, maybe why no one has replied yet. Have a look at these threads for now.
https://www.badcaps.net/forum/showthread.php?t=35517
https://www.badcaps.net/forum/showth...164#post423164

The method I use is different to what others use, so I might not want to talk much about the other methods.

[dspok]

Re: how to use lab power supply on checking short?

@rievax_60

Just curious, why you don't want to talk about other methods?

[rievax_60]

Re: how to use lab power supply on checking short?

@rievax_60

Just curious, why you don't want to talk about other methods?

I have nothing much against them, just personally prefer the way I do it. I use much less current, 0.5A compared to up to 5A. On the other hand I need to use a DMM that can resolve 10 microvolts like a Fluke 87V. And also requires more understanding. All of my measurements are ground plane voltage drops. This method doesn't find shorts in large BGA chips well. Mainly good for finding shorted chip capacitors.

With any method, the most important precaution is to limit the maximum applied voltage to 1V, so as to not cause more damage.