How to find shorted rail

[samanthban]

I got this motherboard few days back when plug in to dc it goes up to 0.7amp and stuck .

later i found that PL30, PL32,PL34,PL35,PL37 coils are shorted to ground.

I,m sure all these coils are not shorted to ground due to cpu on board.

its a bga chip.one of above shorted to ground.

if i can remove the cpu its easy to find and here iam stuck due to cpu on board .

please give me a solution to find the genuine shorted rail.

schematic is attached ..Thank you very much

[subroto]

Re: How to find shorted rail

Find out the culprit with Vin of core voltage generator ic or graphics voltage generator ic. Actually most of the short is occurred by ceramic capacitor with Vin of stepdown regulator IC.

[samanthban]

Re: How to find shorted rail

Find out the culprit with Vin of core voltage generator ic or graphics voltage generator ic. Actually most of the short is occurred by ceramic capacitor with Vin of stepdown regulator IC.

Thanks for your idea

[samanthban]

Re: How to find shorted rail

any other suggestions please welcome!!

[samanthban]

Re: How to find shorted rail

when I inject 0.9v to PL34 cpu warming up

[raajkumar]

Re: How to find shorted rail

when I inject 0.9v to PL34 cpu warming up

Did you solved this problem ? I got a laptop with same problem yesterday. I looked with a magnifier for broken ceramic capacitor, Finally i found a cap on PL32 line +VCCSA area. I replaced it and the laptop working now.