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With both battery and charger connected is steady voltage 1.05v.
Without batteries momentarily 3.3v on PM_BATLOW_L after a while 1.05v.
With battery alone is 1.05v when I press the power button.
Starts when I connect pin 1 to pin 2 - R1212
I replaced R1212 and it started up for a while
SMC bypass does not help.
The battery is tested and operational.
MacBook with battery loops startup sound.
Only disconnecting the battery or the trackpad flex helps.