820-01521 5.21V and 0.267A

[ajdoc]

Liquid damage with previous attempt of repair.
C7296 missing. Liquid damage around U3200, Q3450, U6400.

PPBUS_G3H - 12.4V
PPBUS_HS_CPU - 12.3V

LDOs around both CD3215 got correct diode mode readings.

Any idea where to start?

 

[2informaticos]

As always for T2 machines; start with DFU mode.
If not recognized, then check if all AWAKE and SLPS2R voltages are present.

 

[ajdoc]

Not recognised in DFU

PPVDDCPU_AWAKE - 0.75V
PPVDDCPUSRAM_AWAKE - 0.8V
PP1V2_AWAKE - 1.18V
PP1V8_AWAKE - 1.78V
PP3V3_AWAKE - 3.23V

 

[2informaticos]

"and SLPS2R"
If all mentioned voltages are present, then should be T2 internal issue.
Or severe liquid damage on USB-C area and can't have communication with the other MacBook.

 

[ajdoc]

SLPS2R voltages are OK,

Thank you for your help, will check USB C area