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Got myself a water damaged 820 2879
green light and no fan spin.
ppbus_g3h =12.59
pp3v42=present
pin 14 u7000 3.24 smc_bc_acok
3.34v pp3v3_s5
not sure if any of those measurements help.
kind regards
if shorting power pads = pin 5 of J5713 to GND then the fan spins for a short time. I am not holding wire for more than a few seconds.
Holding it for longer seems to kick the fan into high. I also do not have the board in the body at this time. I am unsure if this makes any difference.