820-00840 PP3V3_S5 shorted

[bamboofuto]

Hi all,

i am working on macbook pro A1708 820-00840 water damage around USB iC U3200 and PMIC U7800. took out U3200 and U7800 but still has shorted on PP3V3_S5.
i tried to inject 1V and 3.5A but can not detect the heat.

any suggestion will be appreciated.

[kevingill]

Do you have a thermal camera?

[bamboofuto]

Do you have a thermal camera?

unfortunately i dont have. usually for finding short i use my finger and rosin dispenser

[mon2]

What is the resistance to ground of this shorted rail?

[bamboofuto]

What is the resistance to ground of this shorted rail?

1.9 ohm short to ground

[mon2]

It may be bad news but review this thread:

https://boards.rossmanngroup.com/thr...shorted.52266/

continue to update this thread with your progress.

[anhbanxoi]

Touch the CPU you may feel some heat.

[bamboofuto]

Touch the CPU you may feel some heat.

i touch the pch is a bit warm

[bamboofuto]

It may be bad news but review this thread:

https://boards.rossmanngroup.com/thr...shorted.52266/

continue to update this thread with your progress.

i touched pch a bit warm..could it be the culprit?

[anhbanxoi]

i touched pch a bit warm..could it be the culprit?

I think it's gone. I got the same situation with the same board

[bamboofuto]

I think it's gone. I got the same situation with the same board

sigh.....
anyway, thanks for the help anhbanxoi, mon2