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Hello everyone,

I am troubleshooting a MacBook Air M1 Model A2337, Logic Board 820-02016 that suddenly went completely dead with no signs of life, no trackpad click, no display.

Here is what I have done and found so far.

Initial testing involved trying a soft reset and testing different USB-C chargers including a 75W PC charger, but the board pulled no current and remained unresponsive.

Battery isolation was the next step. I opened the Mac and disconnected the battery connector. Testing on wall power yielded the same result, it was totally dead....

Goes to recovery when plugged in with another Mac, shows in finder with a question mark and serial number. When revived fails at error 9 (the laptop turns off and on?) In the Apple Configurator when in dfu, gives error restores device removed before restore completed 0xFAA (4010). Tried in intel and m1 based Macs.
History, came in with severe liquid damage and bubbly motherboard Transplanted t2/ recalled ram, u4730, all 4 nands and u4770.
Below is the log from console, the usb meter negotiates at 19v and goes as high as 2.4A


Apr 1 08:36:25 macs-MBP UARPUpdaterServiceDisplay[1440]:...

Hi everyone,
I have a MacBook Air A2179 in my hands that had power problems (5V to the USB-C port unstable).

I noticed there is liquid at U3200 and U3100 and have replaced them.
PP1V5_UPC_X_LDO_CORE : 1.575V
PP3V3_UPC_X_LDO : 3.280V
PP3V3_G3H_RTC: constantly fluctuating from 0.5V to 3.284V
I have isolated R6979,
Pin 1: 3.280V stable
Pin 2: 0.447 (diode)
PPBUS_G3H: 12.28V (with R6979 isolated)
PPBUS_G3H: fluctuates 5V -> 4V -> 6V -> 12.28V(when R6979 is present), and repeats in a loop
What should I do next?
...

hi all techs

require some help on this 820-00281-A macbook motherboard came in dead and the pch bga U1100 (SR2NH), u5000 , Q7056 , U7000 and bios U6100 ,looks like these have been tampered with ..also the battery is swollen..

adapter usb c 20.5v 4.7a 96w , i persume it should power on mb without battery..

update:

when adapter plugged in , power switch which 3.3v on it , when power button pressed both fans come on after 6 secs for about 20secs approx then goes off , nothing on the display stays as blank.. the voltage at the usbc out start from...