Delta DPS-300AB-9 blown caps

[alindumitru46]

I received this psu and checked if it's okay, a mobo power up without isuues. Everything OK.
But since I joined the forum badcaps, I really felt a further visual inspection.
Surprise: 3 swollen capacitors, one being wrapped in plastic, probably for insulation.
Because is SFF psu, I had to desolder 2pcs 16v 1500uF Capxon and 1pcs 6.3V 2200uF Capxon (wrapped cap).
All are GL series, PL732/PL738, 105degrees, VENT, dimensions 25x8mm-4mm.
What is the best option to replace them?
I have other caps, but different high and diameter. How important is height and diameter of caps in this case? The wrapped cap must be re-wrapped?
Thank you?

[Behemot]

Re: Delta DPS-300AB-9 blown caps

Replace all of them right away, they'll go bad later anyway. I think the heatshrink was used to protect if from heat if it was near heatsink, which just made it worse. I never use that.

You should keep size to squeeze the caps in there. You may sometimes push couple larger caps in there, but not all of them. I got lots of different D10 and D8 caps for ATX PSUs so I can send ya if you won't find anything usefull.

[Per Hansson]

Re: Delta DPS-300AB-9 blown caps

Are you sure about the diameter of the caps?
Because I only see 10mm in the CapXon GL datasheet for the caps you mentioned.

If it's really 10mm this is what I would recommend:
http://www.digikey.com/product-detai...0S/565-3867-ND

http://www.digikey.com/product-detai...0S/565-3838-ND

What's important in a PSU is that you match the ESR (impedance) as close as possible to the old caps. (Ripple current you can always go higher than the originals, but not lower).
Diameter and height you can change as long as it will fit

The wrapping is probably to protect against short circuit against a live heatsink.
You can just use heatshrink tubing...

EDIT: I was slower to type than Behemot
Also in your newly attached photos the caps do look like 8mm so if that's the case the ones I linked probably wont fit.

[alindumitru46]

Re: Delta DPS-300AB-9 blown caps

I know, but a image says more than 1000 words...

[Behemot]

Re: Delta DPS-300AB-9 blown caps

Quality 1500/16 D8 caps do not exist. The best I can do now is 1000/16, maybe 1200/16 in august or so.

[alindumitru46]

Re: Delta DPS-300AB-9 blown caps

I found some caps:
- Sanyo WG 1500uF/16V ripple 2550, ESR 13 vs ripple 1470, ESR 41 for Capxon;
- Rubycon MBZ 2200uF/6.3V ripple 2550, ESR 13 vs ripple 1300, ESR 60 for Capxon.
All for 10x20 size.
Really?!
LE: my bad, my caps are ultra low ESR...

[Behemot]

Re: Delta DPS-300AB-9 blown caps

Ultra-low ESR and mostly gone for a long time. Though I can still get Sunelec caps, it does not belong into ATX power supply, and definitely not into SFF (which usually tend to run even more hot).

[Per Hansson]

Re: Delta DPS-300AB-9 blown caps

Yea, definitively don't use ultra low ESR caps in a PSU, you will have oscillations in most cases.
But are you sure you can't fit 10mm caps instead?
Here is a Russian site, judging by the pics atleast two of the caps they used where 10mm:
http://galaxybrain.ru/ремонт-блока-п...-dps-300ab-9b/

Also don't skip replacing any caps, I noticed you only listed three but the Russian site lists four caps.
But there is also a 35v cap or something between the heatsinks they skipped, replace that one too!

[alindumitru46]

Re: Delta DPS-300AB-9 blown caps

God, how much carelessness ... I do not know if you realize from the pictures, this source is really crowded. I can't believe I missed that capacitor.
@Per Hansson, not only have considered correct, but you've spared me from many troubles ...
Thanks for the warning .

LE: I found another cap - 220uF/25V blowed...

[Stefan Payne]

Re: Delta DPS-300AB-9 blown caps

1. 8mm caps are garbage, see if you can fit 10mm caps instead.
They last a lot longer, according to datasheets.

2. Those caps seems to be almost 10 years old, not that bad for a CapXon
Though the GL series seems to be a lot better than KF series.

Anyway, could be rather hard to fix this PSU, due to the 8mm caps...
Those are not easy to obtain and I woudn't recommend using 8mm caps either...

[alindumitru46]

Re: Delta DPS-300AB-9 blown caps

I managed to replace the bad capacitors. Very hard, because the large diameters causes issues.
Finally I used 1 Sanyo WG + 1 NCC KZG 1500uF/16V , 2 Panasonic 3300uF/6.3V and 1 Choyo 335uF/25V.
The PSU power on and boot an old mobo and looks cold after 20min (I running without the cover with the fan).
The real load test will be in short time.

[Behemot]

Re: Delta DPS-300AB-9 blown caps

Not sure if WG and KZG are good options for PSU, the ESR is quite on the lower side.

[alindumitru46]

Re: Delta DPS-300AB-9 blown caps

It's almost impossible to find 8mm diameter capacitors... Now is important that the PSU is alive.
I'll try to find the right capacitors by original CapXon datasheet specifications before the PSU load test.
Once again the time is too limited . Only 2-3 week-ends on the month.
Thanks again for continuos support, I appreciate your disponibility!

[Behemot]

Re: Delta DPS-300AB-9 blown caps

I have nice stock of KZH 1000/16, 680/16, 470/16 and KZN 1500/6.3, 1200/6.3.