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Mid 2009 Model A1278 / 2.26 or 2.53 GHz Core 2 Duo processor EMC 2326

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Short to ground on PP18V5_G3H

So this system has 17.2v on PP18V5_G3H with 0 resistance to ground.

Removed R6905.

Still shorted

R7062 gets 7v instead of those 17v. Removed and board still shorted.

Fuse on that line is ok..

Any ideas?

Answer this question I have this problem too

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@king_jorg - Maybe you want to head over to Louis Rossmann's YouTube channel where here gets into the logic board repairs.

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@danj yes Sr. I'm watching all of them

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Did this system have a liquid spill?

The MagSafe LED is driven by SMC, I’m not sure I follow why you are focused on 3.425V G3Hot.

I would go back to PPVBAT_G3H_CHGR_OUT Q7050 si7137dp as I’m suspecting that’s your issue.

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Stopped turning on 2 years after water spill.

I had 0v everywhere, i replaced r6905, c6990 and c6999 now i have 3.6v and 17.2v on both sides of r6905 and then i found that on d6905 thats why i thought problem was there. Q7050 and that area looks alright.

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Q7050

All pins have 1v less pin 4 which has 0.22v.

Thats it?

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I would start there.

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So that comes from CHGR_BGATE in U7000.

U7000:

DCIN 0v

ACIN 4v

VDD 0v

PP3V42 G3H 1,7v

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Btw thanks for your help man

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Jorge will be eternally grateful.
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