Re: Dead PSU - Zalman ZM600-HP

I have the same PSU as the OP. It has been powered-on and stable for 3 years... until yesterday. Suddenly, it died and exhibited the same behavior as the OP described.

I searched for leaking/bulging caps, all appeared fine.. except for the large input 420V390uF 85C cap. It has a thin black plastic sheet on the end which was bulging ~1mm. It wasn't shorted so I figured maybe it was just a power surge that caused the fuse to burn.

I tried swapping the fuse, and the fuse went out again.
Next, I tested the MOSFETs....