I may need some help.

So the board still has no post, I measured 1.2v core, 0.69v soc, and 1.1 mem, resistance to ground on soc was just 1ohm, I lifted both chokes, and was able to confirm that mosfets were ok, ended up removing all caps on this line just to realize that the 1ohm short is coming from the SIO, i removed the 0 ohm resistor connecting the Soc to the SIO and the resistance went to 6ohm, same thing resistance I measured in the core.

However, after installing the caps back on, I still got 0.69v, I decided to flash bios once again and this seems to have fixed...

AND IT TURNED ON! no post, but this time I didn't force any signal for it to turn on.

First of all, huge props to "Fix my App" YouTube channel, his series made me look into the power rails of the CPU and BINGO! i was missing the 3VSB_CPU, the EN of this power rail was disabled, on this board, this power rail is enabled by the 1.8v power rail that feeds into the base of a transistor, goes through a 20k resistor, on one side I was measuring 1.8v on the other 0v, resistance was 2.9k to GND, removed the trans nothing, then removed the transistor cap, and bingo, the resistance...

You were absultuly right!

So, new SIO arrived, after soldering back into place, I still measeured 2.4v, so, I removed the mosfet (probably what i should have done from the begining) and the PSON line went from 2,4v to floating, after double checking the datasheet, i noticed that I have missed an important clue, the PSON# pin is an open-drain pin it just pushed the line low, does not keep it high, so the 2.4v were probably coming from a leaking mosfet

Its my undertanding that SLP_S3 is CPU controlled in this particular case, cpu arrives tomorrow, but i was to curius to...

Thanks for letting me know!

But even if that was the case,I still find it odd that PS_ON sat around 2.4v, this pin goes straight to the mosfet with no resistors or caps on the line, a 10k pull-down resistor barely changed the voltage, so i don't think the pin was floating, it looked to me it was being weakly driven.

I don't have a spare AM5 CPU on hand, I removed the SIO already, will wait for the replacement, and once installed i will check the PS_ON voltage again, if it sits at 3.3v and pulls low correctly, that should confirm that the original one was faulty, however...

Yeah, pretty sure it's the Nuvoton that is dead, all rails are there and stable, but it refuses to work, new one should arrive in a few weeks, after replacing it i will give an update to hopefully help someone in similar situation

Hey everyone

I decided to dive headfirst into board repair. I'm a computer engineering student, and I'm attempting to fix my first board.

I have made some progress, and I feel super excited. Still haven't fixed the board tho, but I decided to make a post here to share my progress.

This is an X670-P, seller stated bent pins and no power on, the socket has 2 bent pins, the pins are slightly bent upwards (VSS and a Channel A pin), so it's an easy fix, don't even need to replace the socket, tested all power rails on the CPU and found no shorts, the bent pins...