Air A3114 2024 M3 (820-03286) stuck at 5V USB-C

sekidata

Member
The machine has no signs of liquid damage. USB meter shows 5V 0.16A. PPBUS is 12.3V. PP3V8_AON is present. The main PMU (U8100) does not produce any power rails, it appears to be off despite good input power. What signals are required to turn it on?
 
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