820-01700 (MBP A2141 16" 2019) Corrosion Near SSD, stuck at 5v even after cleanup

[Saurabh]

Hi,

Initial readings on Amp meter: 5.085V, 0.026A
- 3 resistors and 1 cap near SSD (U9100) were damaged. Replaced, still, the readings are the same.
- PPBUS_G3H
Diode mode - 0.044
Resistance -25 Ohm

No other visible damage. What shall I do next?

 

[2informaticos]

"What shall I do next?"
Stop using "register" instead of "resistor".

Compare the readings on PPBUS_G3H with L9581/82.
I suppose U9580 is shorted and SSD is damaged.

 

[Saurabh]

Okay, boss... resistor it is now

Compare the reading???

 

[2informaticos]

"Diode mode - 0.044
Resistance -25 Ohm"

 

[Saurabh]

At L9581
Diode mode - 0.407
Resistance - 2-4 MΩ

 

[2informaticos]

Check if any coil on the board gets similar readings with PPBUS_G3H.
Should be a coil from a secondary power supply connected to PPBUS_G3H.