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So you've got problems to come back from sleep? Test the machine disconnecting angle sensor (J4802).

SSD is directly connected to T2 chip. No need to run Intel side, to get SSD access.

You may be lucky. Replace U9850 and test the board.

Very likely. What is actual diode mode to ground at L9580 (with U9580 removed)? Compare reading with L9080.

Compare diode mode readings on J4802 power rails, w/ and w/o angle sensor connected.

24 ohm is very bad. Compare with the readings on all big coils. Don't forget L9080/580.

Still pulsing on SMC bypass? PLT_RESET_L also pulsing? "Any history available?" ???

CPU core voltages pulsing too? Check R7402 solders and traces.

Thanks for sharing.

Any history available? Tried SMC bypass?

Not sure if new MPMU works there. You should try one from same model donor board.

Check SPKRAMP_RESET_L and SPKRAMP_INT_L; voltage and diode mode.

UD200 may be bad too. Even CPU could have been affected.

Follow the instructions on that link. You may need to play with that switch and power button also. BTW, write directly into bottom reply box, instead of clicking Reply button. I don't see any reason to quote an entire post, visible few centimeters above.

Check UD200/1 and adjacent components.

First of all, welcome to the forum! Do you get now 5V at C8300? Did you test external video and USB activity? Did you get the MPMU from same model donor board? Tried using external switch method (over SV000)? https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)#DFU_Mode_using_external_switch...

You should replace UF400 first.

Do you get same thermal spot if you connect charger on the other USB-C port? Did you try to reflash UF260?

SoC ROM should be updated in DFU process.

Test it starting in safe mode.