I've got an MSI PRO Z690-A WIFI DDR4 that has no reaction to the power button. I have been doing some exploration to try to determine what is wrong with it.

The front panel PSIN# pin has 3.3V on it, so i started tracing from there to the SIO, which is a Nuvoton NCT6687D. Connectivity from the front panel PSIN# to pin 61 on the SIO is good and when I short PSIN# to GND then pin 61 goes low as it should.

However, I noticed that SIO pin 61 PSOUT# was already low, even before I activated PSIN#. Does this mean the SIO chip is hosed or could there be another explanation? I'm...

Hi, I'm Karl and I'm learning about motherboard repair.