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Old 01-21-2021, 01:02 PM   #181
Xan03
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Default Re: Original Xbox Replacement Caps

0.22ĶF/50V according to here.

I guess film would be one alternative if one can source the right pitch... and provided the presumably much lower ESR doesn't cause any issues.
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Old 01-23-2021, 07:04 PM   #182
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Default Re: Original Xbox Replacement Caps

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Originally Posted by Xan03 View Post
I actually went ahead and did some pictures of the PSU, there's some discoloration on the PCB between a diode, resistor and ceramic cap (?), did anyone see that before?
Might be the snubber circuit for the standby PS or perhaps the primary-side auxiliary rail rectifier.

I know on some older Delta PC ATX PSU designs, the primary-side auxiliary rail rectifier diode would discolor like that. Delta typically used a 1N4002 there, which is just a regular diode and not even a fast-recovery type. I haven't seen one fail in an old Delta PSU like that, though. Both my DPS-300KB-1 and slightly newer DPS-300AP-15b had that darkening of the PCB. I tried a more powerful fast-recovery type (FR153) for that diode in both units, but the DPS-300KB did NOT like it at all - its 2-transistor 5VSB circuit started oscillating and screeching badly. The DPS-300AP-15b was OK with that substitution, though.

With that said, I can't really recommend anyone to do the same with this PSU... if that diode even has the same function (I haven't determined that yet - would need more pictures of the top and bottom of the PCB of that area.)

But chances are, the PSU will probably function with that hot diode for many more years. On the other hand, if the caps for the standby circuit go bad, there is a chance that diode could go up in smoke too. So that's probably a good reason to recap those Ltecs if time and budget allows.

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By the way, what's the story on those sub-1ĶF electrolytics? I don't see any Panasonic etc. for sale with such low capacity so I guess you replace them just with whatever is available?
I probably wouldn't even worry about them.
With such a small capacity, their ESR probably hardly matters. GP 105C caps should be fine. Or entry level like Nichicon PW/PM/PS/PJ and Rubycon YXJ are good alternatives to Panny FC (and likely cheaper too.)

Or use film caps, as sjt suggested.

Quote:
Originally Posted by Xan03 View Post
I guess film would be one alternative if one can source the right pitch... and provided the presumably much lower ESR doesn't cause any issues.
It shouldn't.

My guess is they went with electrolytic, because above approximately 0.1 uF, film caps start to get more pricey and a bit too large.
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Old 01-27-2021, 05:40 AM   #183
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Default Re: Original Xbox Replacement Caps

Hi all, I have read through the post and even if there seems to have substitute to the Nichicon HM 3300uF ones proposed, they do not match ESR or ripple current (12mohm and 280Arms). I found Panasonic FJ matches exactly but seems an odd product that we cannot find... Any of you have a try with polymer? Even if this is more expansive.
Thank you

Last edited by Armandooooo; 01-27-2021 at 05:42 AM..
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Old 01-27-2021, 05:49 AM   #184
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Default Re: Original Xbox Replacement Caps

3300uf in what position? infront of the cpu?
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Old 01-27-2021, 05:56 AM   #185
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Default Re: Original Xbox Replacement Caps

Panasonic FR 3300ĶF 6.3V worked for me to replace those, it's a bit worse in specs yes but who knows for how long Nichicon HM of that vintage ever worked according to their spec so it may barely be a downgrade in practice. One could even go for the 16V version if feeling very adventurous, which is basically even superior to the original cap, but you'd probably have to install them at an angle to get around the bigger size.

If you want to just go the poly route there's plenty of reports here if you look back in this thread.
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Old 01-27-2021, 09:32 AM   #186
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Default Re: Original Xbox Replacement Caps

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Originally Posted by Armandooooo View Post
Hi all, I have read through the post and even if there seems to have substitute to the Nichicon HM 3300uF ones proposed, they do not match ESR or ripple current (12mohm and 280Arms). I found Panasonic FJ matches exactly but seems an odd product that we cannot find... Any of you have a try with polymer? Even if this is more expansive.
Thank you
Nichicon UHV and Rubycon ZLQ are my go to. If you are working on a 1.6, you need to go ZLQ as the 12.5mm width of the Nichicon's are a little too wide.
Here is a 1.6 I did with the Rubycon ZLQ's https://www.badcaps.net/forum/showpo...&postcount=160

https://www.digikey.com/en/products/...C10X25/6049998

https://www.digikey.com/en/products/...332MHD/2598225
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Last edited by jayjr1105; 01-27-2021 at 09:36 AM..
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Old 01-27-2021, 10:08 AM   #187
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Default Re: Original Xbox Replacement Caps

Problem with that is you can't really get those caps in Europe and shipping from overseas will cost about 10x more than the parts themselves.
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Old 01-27-2021, 10:11 AM   #188
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Default Re: Original Xbox Replacement Caps

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Problem with that is you can't really get those caps in Europe and shipping from overseas will cost about 10x more than the parts themselves.
Why not, just because I used a US based site, doesn't mean you can't search those part numbers in Europe based distributors.
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Old 01-27-2021, 10:15 AM   #189
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Default Re: Original Xbox Replacement Caps

Because local distributors just don't stock them? And yes I could order from Mouser, Digikey etc. but that's where the aforementioned shipping and customs come in.
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Old 01-27-2021, 11:07 AM   #190
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Default Re: Original Xbox Replacement Caps

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Originally Posted by stj View Post
3300uf in what position? infront of the cpu?
Yes, correct, the famous bulging ones!!
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Old 01-27-2021, 11:33 AM   #191
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Default Re: Original Xbox Replacement Caps

Quote:
Originally Posted by jayjr1105 View Post
Nichicon UHV and Rubycon ZLQ are my go to. If you are working on a 1.6, you need to go ZLQ as the 12.5mm width of the Nichicon's are a little too wide.
Here is a 1.6 I did with the Rubycon ZLQ's https://www.badcaps.net/forum/showpo...&postcount=160

https://www.digikey.com/en/products/...C10X25/6049998

https://www.digikey.com/en/products/...332MHD/2598225
Hi all,

The ZLQ does not exist in 3300uF and for the uhv I see their specs are 16mohm and 2500mArms, which is close but still a bit far off. Are they working fine with those?

Thank you
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Old 01-27-2021, 11:38 AM   #192
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Default Re: Original Xbox Replacement Caps

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Originally Posted by Armandooooo View Post
Hi all,

The ZLQ does not exist in 3300uF and for the uhv I see their specs are 16mohm and 2500mArms, which is close but still a bit far off. Are they working fine with those?

Thank you
It's the best you can get in an electrolytic anymore since ultra low ESR electrolytic's are a thing of the past. Panasonic Might have 1 that is slightly better mArms but ESR is 20mohm.
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Old 01-27-2021, 11:57 AM   #193
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Default Re: Original Xbox Replacement Caps

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Originally Posted by Armandooooo View Post
Yes, correct, the famous bulging ones!!
well if you have 5 positions then use 5x 1500uf polymers

if you have a 1.6 board with only 3 spaces then use 3x 2000uf polymers
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Old 01-27-2021, 02:03 PM   #194
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Default Re: Original Xbox Replacement Caps

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well if you have 5 positions then use 5x 1500uf polymers

if you have a 1.6 board with only 3 spaces then use 3x 2000uf polymers
Sorry for the question but 3300x3=9900 isnít it different from 5x1500=7500? Or there is another factor I donít get?
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Old 01-27-2021, 06:19 PM   #195
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Default Re: Original Xbox Replacement Caps

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Sorry for the question but 3300x3=9900 isnít it different from 5x1500=7500? Or there is another factor I donít get?
It was originally spec'd with five 1500 caps which = 7500uf. Polymers you can get away with lower capacitance since they are a much more stout cap.

Anywhere from 6-10,000uf you'll be fine.
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