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Voltage on PP3v3_G3H? 5.2 volts is your problem NOT PPBUS.

Check for voltage to RAM as mentioned. If voltage is present, reflow RAM and pray. If RAM doesn't fix it, bad CPU, bad internal trace etc and waste of time.

Resolder U8900 super super common

Bad GPU bad VRAM bad CPU bad internal trace. Sounds like a waste of time.

Inspect all chips with 3v42 including U1900 I had that happen once

Going to have a dead GPU tomorrow as well so be ready

It?s not original use a KNOWN GOOD OEM 85 watt MagSafe 2. BATLOW is often missing because of bad/incorrect charger....

Any history of drop damage etc? Tried external with internal screen disconnected?

Very very likely a bad U6200. One from a Retina Pro donor board will do the trick make sure same year board 13/15" does not seem to matter.

Likely trash but try BIOS and all that 2informaticos suggested.

Your issue is NOT the SMC then most likely. You have a bad ISL and both sets of current sense resistors are blown. Fix that issue first.

12.2 is no good. SMC_RESET_L voltage? Seems like your blown battery probably killed the ISL or SMC

If no liquid, shorts, or drop damage...usually a waste of time. Have to look very closely for corrosion or any hints. Also have to have PP3v42, PPBUS, PPVRTC_G3H, PP5v_S5, PP3v3_S5, PM_BATLOW_L all present before saying missing PM_SLP_S4_L is the problem. I always check those specific rails...

You bridged something more than likely which shorted Q8930 and likely killed theGPU. You must replace all fets and U8900 when something like that happens on the off chance it survives.

Check for short between PPBUS and GPU VCore. If so, RIP.

Have you tried a new battery? Usually when the PPBUS caps short they kill the battery.... Also check R7005/6

Dead CPU most likely the on off on is no bueno on 00164/5. Try BIOS first tho to rule that out.

Fair warning this will have a dead GPU tomorrow so yeah

I would tell the customer to wait and order one if you can. That seems like the issue most likely. Not really a WiFi power circuit on these like on MacBook Airs. Usually, bad I/O Board is the issue.

Gotta be a bad WiFi card, I/O Board, or the flex going to the I/O Board. Did you try a new I/O Board?