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"Short to ground is 1.600MΩ"
I can't understand this; is short, or not?
"RTC - I can't check"
Why???
I wrote SIGNALS; so i didn't reffer to an oscillation; in case you don't have o-scope.
There are 4 (FOUR) RTC signals (voltage levels) to check.
Missing PM_BATLOW_L points more to SMC side than PCH, but check these signals anyway...
If PM_SLP_SUS_L is OK, PCH does something at least.
Does the board starts with both charger and battery connected?
Check if SMC receives 32KHz in S5, with charger.
Original charger, but is 85W???