MacBook A2179 / Board 820-01958 - liquid damage, Stuck at 5v.

[2informaticos]

First of all, welcome to the forum!

Be sure all resistors in that area have correct value.
Also replace corroded caps.

Don't waste time hunting DC signal with o-scope; use DC voltmeter.
Do you get L6960 voltage?

What is the USB-C behavior (on ampmeter), when both charger and battery are connected?

 

[zeydullak]

Just measured the Resistors near the corroded area without removing resistors from the board.

R7664 - 3.1 Ohm
R7666 - 2.5 ohm

R7684 - 2.3 Ohm
R7686 - 3.2 Ohm

 

[2informaticos]

With such damage caused by liquid on audio flex/board, T2 is very likely dead.
Leakage from PPBUS_G3H to T2 data line happens very often on these models.

 

[zeydullak]

So basically PPBUS-G3H damaged the T2 chip by shorting to the data line. Are there any other steps I can check to be sure if T2 is dead or not? Like to tell the customer the exact answer. Thank you.

 

[2informaticos]

Check diode mode to ground on T2 data lines going to audio board; like SPKRAMP_RESET_L, etc.

 

[zeydullak]

Yes, it is shorted to the ground. It made a beeping sound. This is the end, right?

 

[2informaticos]

Unfortunately, yes...