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someone tried to change the battery on a 820-2936 MacBook with a fake one and now it does not start. I get a green light in the charger but PPBUS_G3H is 3.46V.
On ILS chip U7000 I measure resistance 17/18 3.2Ohm and 27/28 is 20.4Ohm.
Check again, you have too big difference; should be less than 1%.
If still bad, remove D6950 and check again.
Also disconnect BIL connector.
Next step, if needed, remove ISL6259.
If still difference, SMC is the last option...