Dell GX620 SFF PSU, Trying to find replacement cap

[tedjar]

I'm working on trying to recap a Dell GX620 SFF PSU. (After recapping the board with a badcaps kit) There were two failed caps (bulging tops) inside the PSU.

I removed the caps (can't see any of the printing on them, it's so jammed together), found datasheets and got subs for everything except:

Ltec LZP series, 2,200uF - 16v - 1.925a ripple - 0.040ohm impedance, in 10x28mm size

I searched digikey and mouser, and they do not seem to have anything in 10mm diameter with that high a ripple rating; they are all 12mm diameter.

The design is ridiculous inside this PSU, they caps are all snuggled together so I do not see any way to get a 12mm cap in there.

The offender:


Also, for reference here are the other subs: (Larger caps only, I'm leaving the little ones alone)
A- Teapo - SC - 2200 - 10- 10x20 - 1.330a - 0.047ohm
A- Panasonic - FC - 2200 - 10 - 10x30 - - 1.815a - 35mohm

B- Ltec - LZP - 2200 - 16 - 10x28 - 1.925a - 0.040ohm
B- <still looking>

C- Ltec - LXY - 1000 - 10 - 8x15 - 1.300a - 0.040ohm
C- Panasonic - FM - 1000 - 10 - 8x20 - 1.56a - 30mohm

D- Teapo - SC - 220 - 35 - 8x15 - 0.730a - 0.100ohm
D- Panasonic - FM - 220 - 35 - 8x15 - 1.24a - 41mohm

[brethin]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Unless I am mistaken the Samxon GD 2200uF 16v 10mm x 25mm 0.012Ω 2800mA 105oC
sold here at BCN store would be what you need.

[yyonline]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Larger caps only, I'm leaving the little ones alone

I'm not sure that's the best way of doing it for a power supply. It works for computer motherboards, since the small caps on those rarely fail. However, I see the tiny caps on power supplies blown all the time. At least, if not more often than the larger power supply caps.

[tedjar]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Unless I am mistaken the Samxon GD 2200uF 16v 10mm x 25mm 0.012Ω 2800mA 105oC
sold here at BCN store would be what you need.

This does look good.. shipping will be pain but what else am I going to do? I looked at the rubycon stock but not samxon stock...

I'm not sure that's the best way of doing it for a power supply. It works for computer motherboards, since the small caps on those rarely fail. However, I see the tiny caps on power supplies blown all the time. At least, if not more often than the larger power supply caps.

Normally I would just do them all, but I was trying to avoid it because the board is very difficult to solder, has tons of SMT parts on the solder side, and I'd like to not break it in the process. Some of the small caps are trapped in under the heatsinks and other parts, I'd have to desolder some parts that are in the way just to get to them. This PSU was working when I took it apart, I didn't actually expect to find anything wrong with it but there were the bulging caps.

I'm trying to weigh the risks of damaging the board/other compoents vs. the small caps being bad.... I'm still not sure.

[PCBONEZ]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Opps - I jumped to mobo issues w/GX620.
.
BRB

[PCBONEZ]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

LZP Specs 16v @/2200uF
10x23mm .. Ripple = 1925 mA .. ESR = .040 ohms
12.5x20mm .. Ripple = 2070 mA .. ESR = .031 ohms

Those specs are completely unimpressive.

If a 12.5mm will fit Panasonic FC are good enough.
[The FC's Ripple = 1945 & ESR = .030]

If they MUST be 10mm the look for Panasonic FK or go with Samxon RS.
In 10mm 2200uF 16v those are usually about all you can find available.
[In the USA Panny FK that are not the SMD version are rough to find. Not so hard in the UK though.]
.

[tedjar]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Unfortunately they need to be 10mm. They literally sit touching each other on the board, they compromised badly to make the unit smaller.

I don't see the FK series anywhere that I can actually purchase them. Mouser stocks the SMT versions only, Digikey has nothing.

If it wasn't for shipping fees I would have just ordered the Samxons already, but it does not look like I have a choice. It supports the site anyway....

Would it be a bad idea if I got some 12.5mm FC, covered the leads with shrinkwrap and mounted them sticking off the board so they could be bent over to clear? This seems like a crappy hackjob to me...

[PCBONEZ]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Unfortunately they need to be 10mm. They literally sit touching each other on the board, they compromised badly to make the unit smaller.

I don't see the FK series anywhere that I can actually purchase them. Mouser stocks the SMT versions only, Digikey has nothing.

Farnell lists FK last I looked but it's a special order with a fee.
Newark 1 does here too but they just get them from Farnell and pass through the fees to you.
~ You didn't list your location in you profile so I didn't know what to suggest.

If it wasn't for shipping fees I would have just ordered the Samxons already, but it does not look like I have a choice. It supports the site anyway....

I buy 20-30 at a time because something that needs one/some always comes up eventually.
[The 3300uF/16v and 3300uF/10v RS 10mm. - I use them in place of 2200uF 10mm in PSUs.]

Would it be a bad idea if I got some 12.5mm FC, covered the leads with shrinkwrap and mounted them sticking off the board so they could be bent over to clear? This seems like a crappy hackjob to me...

Yes, bad idea.
Will add about .01 ohms to the ESR.
If you are gonna try that trick then get caps with .01 less ESR than the originals and it -might- work.
-
You are MUCH better off with the RS though.
.

[tedjar]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Sorry about the location thing, I think you have to have a couple posts before you can change your settings because I tried before and couldn't. I did it now..


This looks like the right Panasonic FK, and it seems to be in stock too.

http://www.newark.com/panasonic/eeuf...16v/dp/32R8994

Datasheet says:
16v/2200uf - 10x30mm - 2.140a ripple and 0.025 ohm impedance

Provided they have the rest in stock this seems like the best solution as I can get everything from one place.

Yes, bad idea.

Yeah, scratch that. I'll get the right parts.

[brethin]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

I will sell you (1) Samxon GD 2200uF 16v 10mm x 25mm 0.012Ω 2800mA 105oC
sold here at BCN store for $2 (total which includes shipping to your location), as I am planning on ordering a few from here this week, if you are interested let me know.

Not trying to bust in on BCN business but if I am buying from here and sell 1 cap on the side it's better for everyone.

[brethin]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Anyway I just ordered some of these because I need a few for repairs so if you just want 1 I have no problem sending you just 1 for $2 (total shipped). Let me know.

[tedjar]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Anyway I just ordered some of these because I need a few for repairs so if you just want 1 I have no problem sending you just 1 for $2 (total shipped). Let me know.

Thanks for the offer. If the FK series works out, I'll probably just pick those up while I'm getting the other caps. As soon as I get some free time to setup the order, I'll know for sure.

[tedjar]

Re: Dell GX620 SFF PSU, Trying to find replacement cap

Well, it only took 3 months, but I finally fixed this thing

Newark had stock, then they didn't when I went to order, and then I've been working on a bunch of other projects, school, etc. I had to order something else and I remembered to check for the caps, and they were back in stock again.

I bet everyone thought they'd never see this thread again lol.....

The rare and mysterious Panasonic FK series 2200/16v next to its unworthy Ltec companion:


New caps in:


There is something to be said for using a organizer for the parts, I still had all the parts and screws:


Doesn't get much better than this:


Thanks to everyone who helped on this one, I'm happy to have it back.