ultron un380 pfc random power off

[nick122]

Hi guys,
My 2002 gaming rig started to randomly power off. The PSU is ultron un380-pfc. I've opened it and noticed a few bad JEE caps. The psu has 2 teapos (2200uf 10v and 16v) JEE (2x 2200uf 10v-bad and 1x 16v) Hec (2x 680uf 200v). I know that jee and hec are known crap, so what are the replacement cap recommendations? I have a few teapos (but 3300uf 16v) and ncc kzh 2200uf 16v.

[Per Hansson]

Re: ultron un380 pfc random power off

Sounds like the caps you have on stock might be decent replacements.
Much better than the bloated one in there obviously!

Normally you should keep the ESR very close when changing caps in a PSU, just FYI.
Another issue is the small caps (below 500uF).
They might be critical in a PSU like this and if they go high your 5VSB will increase frying your mainboards southbridge.

[ReeceyBurger123]

Re: ultron un380 pfc random power off

As it works then cuts off Id say bad solder joints probably on the switching inverter or other devices mounted on a heatsink. Also replace the caps as Per said with good quality ones.

[nick122]

Re: ultron un380 pfc random power off

Thanks for replying. What about big HEC caps? Should i replace them? Which caps will be decent replacements?

[stj]

Re: ultron un380 pfc random power off

the only company's making obtainable decent big caps imo are rubycon and nichicon

[ReeceyBurger123]

Re: ultron un380 pfc random power off

the only company's making obtainable decent big caps imo are rubycon and nichicon

Panasonic too but they are normally way too big.

[stj]

Re: ultron un380 pfc random power off

last time i tried to buy a pana in a can with snap-in terminals, i couldnt find a dealer in Europe that stocked them.

obviously people like digikey are out of the question with a £50 minimum

[nick122]

Re: ultron un380 pfc random power off

Replaced them all with NCC KZH and Rubycon USC snap in (big ones). Now it works stable. Pics soon