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 are also not in short, power rails of both southbrides 0.95v and 1.8v also show no shorts.
Given this information, I tried to turn on the board (no cpu, no ram) with a cpu fan attached, but bridging the PWR-SW did nothing, completely dead, so I flashed a new bios, tried again, still nothing.
My next step was to check if the PWR_SW signal was being received by the Nuvoton IC, which it was, so I probed the PSON pin of the Nuvoton, and only saw 2.4v ,which I believe is incorrect. This signal did not change when I bridged the PWR_SW pins. To test if the rest of the circuit was working, I shorted the gate of the MOSFET that the Nuvoton's PSON signal controls, and the PSU and CPU fan turned on.
I hypothesize that I have a dead Nuvoton chip, or some of its power rails are shorted, maybe the Nuvoton chip is not receiving all the power rails is the reason for the 2.4v in the PSON pin.
This is all I have for today, it's 3AM here, I must go to sleep, but tomorrow I will check all power rails of the Nuvoton chip to see if I find something.
I'm really happy with my progress so far, and any advice or validation of my hypothesis would be appreciated.
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 are also not in short, power rails of both southbrides 0.95v and 1.8v also show no shorts.
Given this information, I tried to turn on the board (no cpu, no ram) with a cpu fan attached, but bridging the PWR-SW did nothing, completely dead, so I flashed a new bios, tried again, still nothing.
My next step was to check if the PWR_SW signal was being received by the Nuvoton IC, which it was, so I probed the PSON pin of the Nuvoton, and only saw 2.4v ,which I believe is incorrect. This signal did not change when I bridged the PWR_SW pins. To test if the rest of the circuit was working, I shorted the gate of the MOSFET that the Nuvoton's PSON signal controls, and the PSU and CPU fan turned on.
I hypothesize that I have a dead Nuvoton chip, or some of its power rails are shorted, maybe the Nuvoton chip is not receiving all the power rails is the reason for the 2.4v in the PSON pin.
This is all I have for today, it's 3AM here, I must go to sleep, but tomorrow I will check all power rails of the Nuvoton chip to see if I find something.
I'm really happy with my progress so far, and any advice or validation of my hypothesis would be appreciated.