820-2098 stuck 5v liquid damage

Djsp

Member

Apr 29, 2025

• #1

I have this card blocked at 5v 0.20A-0.25A PPBUS =10v unstable 3v8 aon =3.7 stable I don't get 3.3 LDO the liquid damage affects the MagSafe side, I solved a short on the ic that manages the audio jack 3v8 aon in diode mode and 0.56

 

2informaticos

Administrator

Staff member

Apr 29, 2025

• #2

"PPBUS =10v unstable"
Without battery connected?

 

Djsp

Member

Apr 29, 2025

• #3

2informaticos said:

"PPBUS =10v unstable"
Without battery connected?

Click to expand...

Exact

 

2informaticos

Administrator

Staff member

Apr 29, 2025

• #4

Inspect the board with thermal camera.
Compare with good working board.

 

Djsp

Member

Apr 30, 2025

• #5

I noticed a temperature increase below U8100

 

2informaticos

Administrator

Staff member

Apr 30, 2025

• #6

Check diode mode readings around it; compare with good board.

 

Djsp

Member

May 2, 2025

• #7

The readings around U8100 were normal, in the end I decided to replace it, the machine started working again