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How does the SMC area look like? Any corrosion around it?
You might be missing a S0 power line or have a power line thats out of specification
When probing this make sure the fan is spinning otherwise its not in a S0 state, so you might want to keep plugging the charger in and out to keep starting it back up.
So while the fan is spinning what are the voltages of:
- PP5V_S0
- PP3V3_S0
- PP1V8_S0
- PP1V5_S0
- PP0V75_S0_DDRVTT
- PP1V2_S0
- PP1V05_S0
- PPVCORE_S0_CPU
- PPVCCSA_S0_REG
Firstly go get an ORIGINAL 85W charger, none of that Ebay/Amazon garbage as it will not work half the time only an original Apple one!
Measure PPBUS without a battery connected, should be 12.56V.