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Put some logic on your job and avoid wasting time!
Any reason to measure U7001 with battery alone?
Did you ever see a Magsafe light on, in such case?
You lose SMC_BC_ACOK, good enough to lose the Magsafe light too.
Post basic U7100 voltages in that case; pins 1, 2, 3, 9, 12, 13, 15, 19, 20, 27.
Be sure no short between R7120/50.
PPBUS_G3H charger only = 12.57
With lab PSU only and NO battery I get green then amber light but I can't get the board to power on (have tried powering on using the pads and also with keyboard)
It will, however, power on with lab PSU + Battery and the light does stay on the magsafe (amber)
I don't know how to give you the voltage readings for Q7010 as my board view shows a different orientation of the chip from my actual logic board.
R7121 and 22 were open circuit. Replaced both and problem solved.
You are an absolute genius! I don't know how you do it but I will read through our discussion and try and understand why you asked me to do the things you asked me to do.