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This Mac drove me crazy, even changed the T2 chip and after some more testing and research I found out that the problem is the RAM, lots of this model Mac and some other newer ones are having the same issue, the symptoms described here along with and OS error message about hash mismatch have to...

Clean board, fan spins fast right before it reboots this happens after 2-5 minutes of it being turn on. Installed clean OS after T2 restore, same problem and it was very difficult to install OS since it will error out, only completed installation after several tries. Installed new NANDs and...

But only one port is cycling, all others stay at 5V solid. All SSD lines are not shorted. Replaced U9080 and same thing, could this be NAND problem youre saying?

Board had some corrosion around the edges, I replaced all 4 CD3215 from donor and also replaced UB090 as well as U2800 with correct firmware, but one of the ports loops every 20 seconds, not sure where to start. All LDO present Also replaced the ISL9240

All big coils on par with good board

Board had some liquid damage around WiFi IC, that is now fixed but 3v3_S5 and 5v_S5 jump all over, PPBUS 13V board alone takes 20V and around 0.040A

I know, thanks anyways

No voltages at all, does not enter DFU.

First time I get a 820-02188 here, clean board, tested with different original charger and same thing. I dont even know where to start with this boards, but charger and board alone gives me no voltage anywhere, I then located what I think it is ppbus line and started there with 4V, 8V then 12V...

I read its contents and re-wrote them on a new chip, I have done this on other boards such as 820-01700 with no problem when this IC go bad.

Board had very very little corrosion in one corner of UG400 I replaced that and still same, DFU restore results in error 21. PPBUS_AON - 12.0V PP3v8_AON - 3.8V PP5v_S2_MAIN - 5.2V PP3v3_S2 - 3.2V PP1V8_S2SW - 0V PP1V2_S2 - 1.2V PP1V2_AWAKE - comes up to 1.2V for a few seconds then drops to 0...

Found a problem on G3S fixed it then found another issue, this board has multiple problems and no longer is worth the time to fix, thanks for your help!

Yes, I tried but does not enter DFU

Yes, I get 20V without battery, all test are done with OG 96W charger

No power with charged battery, stays at 20V 0A

Clean board had both U2890 and UB090 bad, also short on U2800 as well as U3200 and U3100, total mess, came in with 5V, now it makes it to 20V but wont charge or restore. All Awake and SLPS2R signals present, following boot sequence it makes it all the way to PMU_COLD_RESET_L and missing voltages...

Well after putting board back in case for DFU restore it booted up fine, I told the customer to make a backup just in case.

Clean board, makes it to 20V but not 5 seconds later goes back to 5V then repeats. Checked for shorts everywhere and found nothing, checked with thermal camera but there is nothing obvius. PPBUS makes it to 12.2V then drops.

Tried new U7000 and U7800 and same result, thanks for your time and help

Im about to return this to the customer, any other tips I should try, this seems really weird to me, the battery is not the problem.