820-02773 A2338 M2 5v 0.05a

[fixupp]

Water damage board around U5700, Q5800 5820 5840 and U8100.
Replaced U5700 then have 3.8v on PP3v8AON.

PP3V8_AON_MPMU_ISNS_VIN is 3.8V
P5vs2 and others S2 rails: 0V.

U8100 is fine as I tried to install this IC to other M2 board then it is working. U8100 seems to not turn on. I have checked all the rails arround and confirm no short.

what should I check next? and what is the condition for the U8100 to turn on. Also, what power sequence for this M2 macbook? thanks

 

[2informaticos]

Check all MPMU LDOs; voltage and diode mode.
Don't bother with "NC" ones...

 

[fixupp]

found the issue with PP3V3_AON.
PP3V3_AON jumping from 0.3 to 0.9 but no short. No short and diot value corrects

MPMU_BSTLQ_LX 3.8
PP5V_MPMU_BSTLQ_XW 5v
PP1V2_AON_MPMU 1v2
PP1v8AON: 1v8