Xbox series s no power no beep.
I have an Xbox Series S 2024 Robot White, and it stopped turning on after a power outage. I've already tested all the standby lines: 12V, 5V, 3.3V, 1.8V, and 1.2V. There's no power reaching the southbridge. I checked all the MOSFETs on SB1P1, SB2P2, and 3P3Gated, and they're fine, but those three voltages still aren't reaching the southbridge.
There's a voltage drop at the gates of SB1P1, SB1P8, and 3P3Gated (which is why they aren't activating). This signal comes from the LM339, which I've already checked and is in good condition, but the IN+ voltage is zero, so it's not activating the signal. This IN+ is an enable signal coming from the southbridge, which for some reason drops to 0V. I've already done some tests by cutting the gate line of this enable signal, and SB1P1 registers correctly.
My question is: is it possible that the problem is the softbridge? I've checked everywhere and there are no short circuits anywhere, and nothing is overheating.
The southbridge is not activating because it is not receiving its voltages.
I'd like to know what you think. Thanks