10v 3300uf substitute

[globiton]

I'm trying to resurrect an hp pavillion 772n but after recapping the board, I noticed a burnt cap in the psu. This box was one of the dustiest messes that I've encountered and after cleaning the psu, I found one teapo 10v 3300uf bulging. I have looked through all my spare psu's and motherboards but can't find that exact value to replace it with. My question is whether a different value can work. It's a 10mm with no room to spare and the only comparable sizes I have are 16v 1800, 16v 1200, 6.3v 1500, 6.3v 2200, 6.3v 3300, and 10v 1500. I'm not sure what function this one serves, I just want to avoid frying the board... Thanks
p.s. -- I feel goofy for asking this but I noticed substitutions made in the mobo recap kits and wondered if power supplies were as forgiving.

[KeriJane]

Re: 10v 3300uf substitute

Hi Globiton

Welcome to the BadCaps Forum.

BadCaps.net actually sells Samxon RS caps in 3300uf/10v with a 10mm can.

Just order a "Custom Kit" and select the ones you need.

There are a few of things I'd like to point out:

1- You should probably replace all of the "secondary" caps in that PSU, not just the one obviously damaged one. The secondaries are usually the smaller ones rated at 6.3, 10 or 16 volts.

2- Most caps used in power supplies are of a special "Low ESR" and "High Ripple Current" design. This is indicated by the series identifier which is usually a 2 or 3 letter code. It is important to NOT use a "General Purpose" cap such as those available at Radio Shack. You can type the brand name and series into Google to search for a datasheet. Examples of Low ESR caps are: Nichicon PW, United/Nippon Chemicon KY or KZE, Rubycon ZL.

3- It is generally considered to be bad practice to harvest used caps from discarded equipment. Caps have a finite lifespan and often change somewhat with use.

4- When substituting, it is usually OK to use less capactiance but never a lower voltage cap. Unless you're absolutely sure that the particular circuit won't exceed the rated voltage of the cap. Caps made by cheap companies like Teapo, Fuhjyyu, Hermei, etc. are often grossly over-rated.
.
5- Caps used on motherboards often have even lower Impedance. These are often referred to as "Ultra-Low ESR" caps.

Have Fun,
Keri

[PM650]

Re: 10v 3300uf substitute

6.3V will work fine in a psu, the same is usually true for mobos too. The only rails that exist in a psu are >10V or <6.3V, so replacing the 10 with a 6.3 is fine if it's a rail capacitor. Teapo is probably the single 'bad' brand of cap that is generally OK to leave in a psu (assuming they aren't bad already), as they seem to survive the lower switching frequency, as opposed to much higher frequency noise on mobos.

[kc8adu]

Re: 10v 3300uf substitute

its either on +5 or +3.3
6.3 is fine.

[PCBONEZ]

Re: 10v 3300uf substitute

Everyone has given you good info.
You have options.

Just make sure:
New caps handle as much ripple the ones you are replacing.
New caps ESR is at least as low as what you replace.

You can look up the Teapo here:
(Click in the Series name [SC, SEK, whatever) and the data sheet should open.)

[globiton]

Re: 10v 3300uf substitute

Thanks for the excellent replies you guys. If this thing was a regular-sized psu, I'd experiment but it is so cramped inside that I only want to do this once. There's not enough room to even rock the caps back and forth during removal. Thanks for the pleasant debut here at badcaps -- hope I can help in the future.

[tazwegion]

Re: 10v 3300uf substitute

You don't need to rock the capacitor if you use a desoldering bulb and pointy nosed pliers, that's how I replaced the hard to get at Teapos in an Asus SFF PSU... and let me tell you THAT was a cramped working environment!