A2338 M1 Not turning on - Repaired slightly but still having issues

[mon2]

This may be one of the bastard macbooks that needs a good battery to boot. Can you test with a charged battery?

[Stephen]

O M G YOU ARE RIGHT I will do that test now and see I do have a spare M1 top case laying around somewhere ill do that shortly....

[Stephen]

Well, lucky for us we have a spare MacBook Pro 13" M1 base model in stock, battery works on it but need to charge it. I will come back with my findings

[Stephen]

Update: swapped out good MacBook top case with good board and put the board we fixed into the top case, battery was left at 30 percent charge. No power, no DFU showing up or recovery, no shorts presently showing on Thermal Imager. When trying to attempt DFU input, the meter shoots up to .28 amps staying at 5Volts. :/

When holding power button only, no spike in amps, but when you input the exact DFU keys the meter spikes up to .30 amps then stays at .28amps then once you let go, it drops to .02 amps

Upon checking further: it seems the UC300 Rail has no power on the ENABLE Signal, however I just replaced the APL 1096 chip and the short went away once I did that. Would a faulty UC300 cause the signal to not move forward? I am seeing this has no voltage readings whatsoever and that it needs it.

[Stephen]

I replaced UC300 and then I found a short on the board after doing that. Why is UT620 shorted? this is the power Touch ID area? That area was reaching 320 degrees and higher that is ABNORMALLY high for a short.

I replaced that chip, but it keeps shorting out, so something is forcing that area to keep shoring. When that area is replaced the board jumps up to .45 amps then drops down to .33amps and stays until that area gets super hot. It came back once I replaced UC300. So I am assuming this is the cause why this board is not turning on.

checking further Q5840 is showing 120 degrees and rising. So these two areas are showing up after replacing UC300.

Right now currently the Board is sitting at .47A

[Stephen]

Hey mon2 got any ideas?