OK the first of the dead Epsilons has been recapped. The initial symptoms remain.
3.3 and 5V sections were recapped with Nichicon HM (only thing Mouser had in 8mm 6.3V 2200uF!) and Panasonic FR for the 16V caps. Nothing too out there, this works like a charm in everything else so unless this thing is *really* picky about caps, I doubt this is the issue. It was making noises before the recap, and its doing the same after.
Voltages come up OK, but the PC that this was in isn't happy AT ALL (it will not post with the Epsilon but it will post with my Seasonic test PSU) and it's making a very odd cyclical hissing/squeal from what seems to be the main transformer when loaded. (pressing on the xformer damps the noise) Noise cycles at 3-4 Hz or so.
Time to look at the APFC circuit perhaps? I wonder if its cycling on and off several times per second? That might fool my multimeter and would definitely piss off the mainboard. Scope time is going to be interesting!
The real question is how FSP went to hell! The Epsilon isn't too shabby if you derate it 150W...LOL.
3.3 and 5V sections were recapped with Nichicon HM (only thing Mouser had in 8mm 6.3V 2200uF!) and Panasonic FR for the 16V caps. Nothing too out there, this works like a charm in everything else so unless this thing is *really* picky about caps, I doubt this is the issue. It was making noises before the recap, and its doing the same after.
Voltages come up OK, but the PC that this was in isn't happy AT ALL (it will not post with the Epsilon but it will post with my Seasonic test PSU) and it's making a very odd cyclical hissing/squeal from what seems to be the main transformer when loaded. (pressing on the xformer damps the noise) Noise cycles at 3-4 Hz or so.
Time to look at the APFC circuit perhaps? I wonder if its cycling on and off several times per second? That might fool my multimeter and would definitely piss off the mainboard. Scope time is going to be interesting!
The real question is how FSP went to hell! The Epsilon isn't too shabby if you derate it 150W...LOL.
