I have a PDP42X3 that powers on for a few seconds and then the SMPS turns off. There is never a picture. There are no visibly blown caps, but I did find a blown FS2 on the YSUS board and replaced it but still the same symptoms. Has anyone experienced this before? Does this mean the YSUS is bad? Va at both YSUS and ZSUS is 58vdc and Vs is 180vdc and the manual says they should be 60vdc and 186vdc respectively. I was afraid to adjust them up and risk causing further damage to anything without some expert opinions first.

Also, is it safe to just unplug the connectors leading from...