capacitor replace

[Ximen]

Can i replace a 250v 680uf capacitor with a 200v 680uf capacitor..?


i have a computer power supply with a capacitor of 250v 680uf blew up because i accidentally kept the voltage level low while i turned it on.. so is it possible to replace it with a low voltage and same resistance..

hope i will get a good answer..



here is the bad cap n the good one..

[goodpsusearch]

Re: capacitor replace

It is possible. I would not recommend it if the power supply in question has active PFC.

[steve2]

Re: capacitor replace

I wouldn't. There is probably a little over 200 vdc there and it would either have a very short life or a shortened life. They are rated at maximum working voltage for a reason.

[Th3_uN1Qu3]

Re: capacitor replace

If there isn't PFC (a big coil near those capacitors), you can safely replace it with a 200v. I've even seen 160vdc caps used in such positions (!!!). The power supply with the 160vdc caps was an AT PSU and worked fine for years till i decided to scavenge it for parts.

[370forlife]

Re: capacitor replace

This looks like a low end half-bridge unit. The caps are connected in series for a total of 500V capacity. A bit much considering they usually have ~320V across these caps, so two 200V's should be fine.