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Looks a bit low for me; compare with good board. I expect 0.300-400 reading. I had one A2681 which started working randomly. It had 0.110-145 diode mode reading. Injecting 4-4.2V for some minutes made it starts; only U8100 showed a bit of heat signature. After some time didn't start again...

Inspect the connectors and their traces. There may be mechanical damage.

What is actual diode mode reading at 3V8_AON?

What is diode mode reading at 3V8_AON?

Sometime S-UEM2 tester doesn't make good contacts; possibly flex issue. Test this, just in case: https://drive.google.com/file/d/1T2AbrR-qsyiPh3KrrX8aEXZP6E6KA8oF/view?usp=sharing Keep in mind, I can't assure is good!

Be sure Q3100 is good. Check for moved components in U3100 area. Should be better to replace the chip, not reballing.

Check all traces and components related with J4401/2.

4.2V shouldn't be a problem. Anyway start with just 1V and slowly increase it. A good thermal camera should detect the culprit before 3V. BTW, set amp limit to max on PSU first.

Not at all; you have short to ground!

Nobody reported such issue similar with old models, for these machines. Also new CPU/GPU power supply chips (SiC/FDMF) are not recognized failing like old FDMF6808. You should really have a bad GPU in this case...

And no external video? USBC meter shows no consumption?

Did you check diode mode to ground at 3V8_AON? Don't waste time with o-scope; as no output voltage, no pulse for sure!

Disconnect internal LCD and test again.

I suppose LIO's thermal sensor is damaged; or not communicating with SMC. If same with known good LIO board/flex, then check J9500 solders and traces; pins 5, 11, 13.

PPBUS_G3H stays at 0V, when board doesn't start? What about 3V3_G3H then?

Does it stay on in Recovery menu?

Are you using 87W charger for sure? Check how it is recognized in another MacBook. Just in case, test with other known good 87W charger.

Backlight and sound go off when closing the lid? If not, check lid signal behavior. For the fan issue, run HWMonitor and check thermal sensors.

Solder wire bypass on R8070...

Check U8070 voltages.