MSI PRO Z690-A WIFI DDR4 no reaction to the power button

[karlp028]

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 not sure if I want to try replacing that chip since it has so many pins.

[DynaxSC]

There are a lot of posts with similar issue, just read it, the analysis is similar in every case. Regarding pin 61 check resistance to gnd without any power, i.e. also no CMOS battery inserted. If still short then the chip/pin might be fried, or another device connected to this network is shorted.