Chieftec GPS-450-AA with dead 20N60C3

[zunasthegreat]

Hello everyone hope all doing well!
I have this PSU (GPS450-AA delta oem) around for like 4-5 years and I had it recapped early 2020 or 2021 with mostly UCC KY and Nichicon PW's. The bulk was and still is fine, the original Ltec's were bloated and empty. The previous issue was some major coil whine noise and at times random shutdowns when going idle. Today it started tripping the mains breaker and I think I have dead APFC mosfets (20N60C3). Right now upon checking I have the Q1 and Q3 FETs dead so far and I guess those are responsible for the PFC circuit. The only thing I care is If there is an easy way to bypass the PFC circuit and if possible without adding the two dead transistors. Nothing seems burned or dodgy and the short was there on the Q1-Q3 FET combo. So any cool band-aid ideas ?

[rogfanther]

Due to the age, you should measure capacitance and ESR from the bulk capacitor. You can see here in Badcaps a lot of stories where it goes bad in pfc circuits.

[zunasthegreat]

The bulk has decent ESR and the capacity is really good around 320~330uF, the dead 20N60C belong to the PFC circuit system. Someone on another post said about removing the DC-1982 board from the PSU to make it PFC-less. The AC voltage here is 220V so I guess it will still work without PFC.