are these caps good for replacing the ones in front of the cpu/gpu on an original xbox?

[bulkchart32]

nichicon

1500 µF 16 V Aluminum - Polymer Capacitors Radial, Can 8mOhm 2000 Hrs @ 105°C

are what i used because i had heard the voltage doesn't matter as long as it is more than the original cap. i'm now reading that high voltage may make the cap's esr too high. is this a good cap for replacing those oem ones?

[stj]

1500 uf polymers are fine - remember to fit all 5 even if the board only had 3 caps installed.

[bulkchart32]

1500 uf polymers are fine - remember to fit all 5 even if the board only had 3 caps installed.

thank u. i also had to replace some caps on my psu. there were 2 1200uf caps that were bulging and i replaced them with those same 1500uf poly caps mentioned above because i did not have any 1200uf caps. will that cause any problems since they are filtering caps?

[stj]

thats a good question,
i know those 1200uf caps, it's a fox psu right?
they always seem bad.
not sure if the poly will work there - you could try but the original is 8mm and the vrm caps are 10mm

[bulkchart32]

thats a good question,
i know those 1200uf caps, it's a fox psu right?
they always seem bad.
not sure if the poly will work there - you could try but the original is 8mm and the vrm caps are 10mm

yes, it is a fox psu. and i was able to fit them. recapping it did make some issues go away but, i'm not having diagonal lines and i wonder if this may be the cause?

[bulkchart32]

yes, it is a fox psu. and i was able to fit them. recapping it did make some issues go away but, i'm not having diagonal lines and i wonder if this may be the cause?

not=now

[momaka]

Don't use polymer caps in the PSU. May end up causing issues (if it isn't already.) Poly-modding PSUs usually doesn't work. Use regular low ESR/impedance electrolytics, like United Chemicon KY, KYB, KZE, or even LXV/LXY/LXZ. From Rubycon, YXJ, YXM, YXH, and ZLQ. ZL and ZLH might be a tad too low, but will work on some circuits too. From Nichicon, PJ, PS, PM, PW, HE, HW, HV. Panasonic - FC and FK. FR, FM, FS are also a tad too low in ESR, but will work in more cases than not.

[bulkchart32]

Don't use polymer caps in the PSU. May end up causing issues (if it isn't already.) Poly-modding PSUs usually doesn't work. Use regular low ESR/impedance electrolytics, like United Chemicon KY, KYB, KZE, or even LXV/LXY/LXZ. From Rubycon, YXJ, YXM, YXH, and ZLQ. ZL and ZLH might be a tad too low, but will work on some circuits too. From Nichicon, PJ, PS, PM, PW, HE, HW, HV. Panasonic - FC and FK. FR, FM, FS are also a tad too low in ESR, but will work in more cases than not.

what issues will poly caps cause in a psu?

[momaka]

In the best case: worse ripple and noise, due to "ringing"... which could possibly translate to a crashing system if the ringing noise is too high.
In the worst case: PSU voltage regulation is lost due to controller loop compensation being affected by the ringing noise. In such extreme cases, you might even end up with a dead or overheating PSU.

In order to use poly caps in a PSU, the PSU has to be designed for it. Generally, that would be the newer LLC -resonance based PSUs that run at pretty high frequencies and don't have an output inductor. The output of any DC-DC modules can also often be found to use poly caps. But if it's an older PSU, chances are it won't be happy with polymers... especially if going with half the capacitance (as is allowable to do on motherboard poly mods.)

[bulkchart32]

In the best case: worse ripple and noise, due to "ringing"... which could possibly translate to a crashing system if the ringing noise is too high.
In the worst case: PSU voltage regulation is lost due to controller loop compensation being affected by the ringing noise. In such extreme cases, you might even end up with a dead or overheating PSU.

In order to use poly caps in a PSU, the PSU has to be designed for it. Generally, that would be the newer LLC -resonance based PSUs that run at pretty high frequencies and don't have an output inductor. The output of any DC-DC modules can also often be found to use poly caps. But if it's an older PSU, chances are it won't be happy with polymers... especially if going with half the capacitance (as is allowable to do on motherboard poly mods.)

what issues can using polymer caps cause in the video signal? i'm having issues and wondering if that is the cause.

[bulkchart32]

Don't use polymer caps in the PSU. May end up causing issues (if it isn't already.) Poly-modding PSUs usually doesn't work. Use regular low ESR/impedance electrolytics, like United Chemicon KY, KYB, KZE, or even LXV/LXY/LXZ. From Rubycon, YXJ, YXM, YXH, and ZLQ. ZL and ZLH might be a tad too low, but will work on some circuits too. From Nichicon, PJ, PS, PM, PW, HE, HW, HV. Panasonic - FC and FK. FR, FM, FS are also a tad too low in ESR, but will work in more cases than not.

don't zlq have a lower esr than zlh?

[momaka]

Well, if the PSU is oscillating due to the very low ESR of the output caps, that could cause all sorts of interference, including to the video signal.

don't zlq have a lower esr than zlh?

From what I remember looking up in datasheets, at least for a few particular sizes that were of interest to me at the time, ZLH had lower ESR/impedance listed than ZLQ... though both weren't that far off from each other. In fact, most of the ZL_ -Rubycon series appear to be a variation of the original ZL series, which themselves tend to be pretty low ESR.
For flyback-type PSUs, I'd say these are OK.
For older SMPSes, I try to go with the YX_ series (or equivalent from other manufacturers), just to be on the safe side.

[stj]

you cant use polymer caps to block dc in an audio or video signal path because of high leakage,
but you didnt use polymers near the video encoder so it's just a post for future reference