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Repair attempt 1: Recently fixed this one after minor water damage. Replaced the RIO because of crackling sound. Tested it, everything seemed to work. Repair attempt 2: Got it back because it wouldn't wake up on occasion. Measure around for a bit and found SMC_LID_RIGHT and LID_OPEN_RIGHT to...

Yes, got fed up with this one. Thanks for helping.

Fixed up major liquid damage near CPU FETS and Wifi/BT area. All voltages present, but not booting, no USB activity. Changed EFI. Dead CPU?

Sorry, bumping my old thread. No odd temperatures (CPU ±80C when it crashes) reported. EFI ASD 155 won't run, I think this is caused more older macs because of a recent EFI update.

This logic board keeps crashing, but only under load. Likely heat related? Any suggestions on this one, I'm not really familiar with this model.

Well, if it was my board this would be true. As it's the customer's board, I would like to be a bit less destructive. So again, any advice on how to safely reflow the GPU?

Would a reflow of the GPU be a viable option in this instance? And how would I do this without messing up the rest of the board?

Customer dropped this laptop and started having problems with the GPU ±3 months later. As a first attempt I've reflowed u9300, didn't help. Any suggestions on how to proceed?

So, I've been struggling with this one over the last few days. * Replaced ISL > No change * Replaced SMC > Didn't work (possibly faulty SMC) * Replaced SMC with 3662 version and clean BIOS > Same behaviour (this one is just for testing, as I don't have any more 3787 donors) I'm guessing some...

Measurement with batt connected w/o batt connected PPBUS_G3H 12.2 V rising to 12.7+ V 12.57 V steady SMC_DCIN_ISENSE 1.62 V 0.4 V SMC_DCIN_VSENSE 2.89 V 2.98 V SMC_CHGR_BMON_ISENSE 0.05 V 0.05 V Difference over R9398 (GPU Phase 2) 0 V >> 0 A draw 0 V Difference over R9399 (GPU Phase...

Ok, I started testing for the suggestions above, but noticed the heatsink got hot real quick. Turns out phase 1 of the GPU is pulling ±35A from the start. GPU problem? I'm confused as to why that VR would even start at this point during POST/boot.

According to the customer it just started doing this, no specific history.

Yes, it starts on only the (known good) battery. Same behaviour.

17/18: 3ohms 27/28: 20,9 ohms Known good battery tested, same behaviour.

It won't let me do that, it starts instantly when I press the power button. Only thing I have left to try is corrupted BIOS maybe? Any other ideas?

Assuming you mean safe mode (holding shift), same behaviour. Both current sense circuits measured fine when I replaced the ISL.

This board works fully (in limp mode / 800MHz) when the battery is disconnected. When the battery is connected it chimes repeatedly, so at the end of the chime, it chimes again. A different battery produces the same result. Replaced ISL6259, didn't help. Any thoughts? Could this be GPU related?

Although the area had some corrosion, traces seem fine. Not sure how to test whether the circuitry for the touch bar actually works. Any suggestions?

Things tried so far: * Boot with wired connection * Boot with touchbar, touchID and screen disconnected * Full reinstall Will boot into safe mode. Had some corrosion on the touchbar side of the logic board.

Np, as long as we don't lose 320 pages of MacBook repair awesomeness :)