A2442 Macbook 820-02098 Amp Meter Reboot

[Instafixx]

Machine initially came in with audio circuits green.
have replaced all 3 audio ics on one side.

It again came in for not booting. I found 3v8_AON short circuited. Before i could inject voltage the short disappeared and machine turned on. Worked for a good 2 days.
Now its dead again with no short at 3v8_AON and Audio Circuit.

Amp Meter goes upto 20v and then reboots.
PPDCIN also reboots as per the amp meter. PPBUS and 3V8 both reboot as per the amp meter.

Without the Fuse its stable at 5V with No Reboot.

 

[2informaticos]

Compare diode mode readings on power rails with good board.

 

[Instafixx]

Thermal Imaging showed audio ic heating on the other side.
Replaced all three there. Device is now on and working.

Ultimately all 6 audio ics were replaced.