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Changed trackpad and flex already. Was minor water damage but not there trackpad or keyboard areas. keyboard has 3.3v at pin 30 and 3.4v at pin 4 trackpad has 5v pin 4 and 3.3v at pin 1 at one stage when testing pin1 on trackpad I touched ground too and it shorted and I had to replace r4808...

Can mark as solved

Bloody hell, just found R7125 was missing, not even there. I can't believe I missed it.. Put one on and I have 12.57v at F7140 now. Put back and we have fan spin and a Apple logo

I figured the same and have stared at it and tested it for hours now.16.25v both sides

removed it sits at 4.8v

ok found sense resistors for charger, checked charger BMON current sense R5429 is 300k and R5439 AMON sense is 45.3k both read 0v

Pin 2 16.45v 3.9 ohms pin17/18 20.4 ohms Pin27/28 Which is correct from my understanding.

no I haven't but they are on system side aren't they?

Board had liquid damaged exclusively around U7100, cannot find evidence elsewhere. Board gets orange and green lights on charger but not power on. PPBUS_G3H measures a fluctuating 3.9 - 4.1v, removed F7140 and PPVBAT_G3H_CHRG_REG measures the same fluctuation. Changed U7100 numerous times...

Replaced Q7035, Q7030 another u7000 from donor board. Pin 27/28 is 20.1ohm Pin 16/17 is 2.9ohms there is 16v on pin 2 U7000 0v on pin 3 U7000 smc_bc_acok is missing again too and ppbus_g3h is now 0.5v i replaced u7000 three times. All from donor board. Does anyone wanna help me persist with...

Upon injecting voltage Q7035 gets very very hot so will change that next

With no F7040 I get between 25 and 30ohms across all pins and Pin 2 F040 gets 144ohms. So short from system side then?

So with R7050 off the board, F7040 on the board and no U7000 I get OL on all pins except pin 1 which is 144ohms. With R7050 on the board it is 144ohms across all pins.

Appreciate the reply man. Yes 2936 is what I meant sorry. After I made the mistake I took those measurements. I have pretty much given up on this though, it's a mind fucking rabbits hole I've concluded. U7000 isn't even on the board, neither is C7050, R7051 or R7052. R7050 is also off the...

I think it should be about 3ohms shouldn’t it?? Anyway its a piece of shit this thing. Pin 2 R7052 beeps to ground. Removed R7050 and pin 4 still beeps to ground. So CHGR_CSO_R_N goes to ground yet R7052 and R7050 are off the board. U5420 isn’t on board so how on earth does it connect to...

Ok sorry the delayed reply, this got pushed to the side seeing as though it’s a personal goal. Understand the smc reset L now. My understanding of it was reversed. So made a mistake. Went to measure resistance of pin 17/18 of the ISL. Charger was still plugged in and I made smoke.. Pads...

820-2396 has green light. Seemed to of charged a dead battery. Zero evidence of liquid damage. Won't turn on. Ppbus g3h is 12.4v smc_reset_l is high at 3.4v im guessing this is why we are not turning on. I tried shorting it to ground as I assume that would be like doing an smc reset but no...

Yes a mouse lights up, always wondered what that suggests as I've seen you ask that a few times before. Lcd was smashed

ok been working on this 820-00163 for a couple days now. It has orange and green lights on charger. fans spin but no chime and no display. Have checked with working display just in case it didn't chime or something in this model. History is i I replaced the display 12months ago. It has now...

Was only no backlight but problem solved. I came in with a fresh mind and fresh eyes this morning. Spent 2 mins looking, changed the LCD cable and problem solved 15min total. Spent a good two hours last night testing and changing crap...