Just got a Dell Dimension 8400 for a recap. The CPU VRM caps are all UCC 4v 820uf. I'm guessing, since there's two groupings of 4 caps, that they're serial, for a total of 16v in each grouping. Two of them have popped in the one grouping, and I'm planning on replacing all 8. Am I okay to replace with 6.3v caps? If they are serial, that'd put it at 25.2v rating for the group.
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Ludicrous gibs!
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Re: 4v caps?
of course you can. the voltage only means how much the cap can take, thats all. as long as you can make the size fit, then upping the voltage is no problem.sigpic
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Re: 4v caps?
The caps at the VRM output (or anywhere else on a mobo) are wired in parallel. Summation of the voltage rating has no technical meaning or validity.Comment
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Re: 4v caps?
To make this clear about series and parallel caps without the technical mumbo jumbo.
Caps in parallel are the sum of the capacitors (just add the uf values up) the working voltage is that of the individual caps and remains the same. Two 1000uf caps at 10 volts in parallel would be equal to 2000uf at 10 volts.
Of course if you didn't use the same voltage caps in parallel then the max WV of the bank of caps is limited by the cap with the lowest WV.
So if for example you had 3 caps in parallel one cap 1000uf @ 10V and two caps at 1000uf @ 20V. That bank wouldn't be able to handle more than 10 volts. No manufacturer would ever be that stupid but just FYI.
So dood in your case the four 820uf caps @ 4V in parallel equals 3280uf at 4V.
Caps in series you get the sum of the caps voltages however there is a tradeoff here you get half the capacitance. For example if I put two 1000uf 20V caps in series I would then have a 500uf 40V cap.
Whenever putting caps in series or parallel they should always be the same make, series, and working voltage.
Yes you can increase the voltage as long as they fit.Last edited by Krankshaft; 10-26-2009, 01:13 PM.Elements of the past and the future combining to make something not quite as good as either.Comment
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Re: 4v caps?
post pics.Originally posted by dood
many of the 8400's i have seen had ucc polys.
if thats what these are its a first!Comment
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Re: 4v caps?
If they are polys then they shouldn't have gone belly up either.Elements of the past and the future combining to make something not quite as good as either.Comment
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Re: 4v caps?
Hmm...I just had to replace 6 680μF 4V polys on an Acer motherboard today. They'd split their tops. The ones I got to replace them from Digikey were about 30% taller.Originally posted by KrankshaftComment
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Re: 4v caps?
What series of cap.
No sleeve does NOT mean it's a polymer cap.
If they are the Sacon/Evercon FZ then they aren't poly, they just look like it.
There are other brands too, just not as famous...Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: 4v caps?
What do the caps in the PSU's look like?Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: 4v caps?
Going from memory, the markings on the top were:
56
680
4
Nothing else, and the negative mark was black. For some reason, I was having problems getting them out (I've recapped motherboards before without problems), so they are a little marked up, but I'll take some pics tomorrow.Comment
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Re: 4v caps?
Polys cant bulge they have no liquid electrolyte to expand into a gas and bulge the can.
But there are lytic manufacturers making them without the plastic sleeves. Nichicon has a lytic series in this category.Elements of the past and the future combining to make something not quite as good as either.Comment
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Re: 4v caps?
Yes, I've seen Nichicon HD without sleeves fairly often all the way back to P3 boards.
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Sleeves aren't a requirement for either kind of cap.
They are just a marking method that for many years was the least expensive way to do it.
They have better ?printers? [?machines?] now for direct marking so that may change.
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Nichicon had an announcement on their site a while back stating they intended to switch some of their old lytic series' to direct marking instead of sleeves but I can't find it anymore and I haven't seen any marked that way on newer stuff yet.
Maybe they changed their mind. ??
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: 4v caps?
Good point.Originally posted by Krankshaft
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Maybe the new counterfeit wolfs to worry about are lytics stuffed in poly clothing.
-Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: 4v caps?
I'm sure the crap cap manufacturers are willing to dim their halos enough to do that. All they have to do is not have a sleeve and not stamp a vent onto the can.
If they're willing to print names like Rubycon and forge the Chemicon logo there's no limit to what they'll do to make a buck.Last edited by Krankshaft; 10-27-2009, 01:18 AM.Elements of the past and the future combining to make something not quite as good as either.Comment
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Re: 4v caps?
Btw, I was wrong, the first number was 54, not 56.
Also, the stamp appears to be in the shape of a K.
Attached FilesComment
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Re: 4v caps?
those are lytics all right.
i would use 820@2.5v fujitsu or ncc polys.Comment
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Re: 4v caps?
I went with 680μF 4V Nichicon LF polys
http://search.digikey.com/scripts/Dk...me=493-3011-NDComment
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Re: 4v caps?
Yup, not Poly and I don't think UCC.
They appear to be Sanyo [now Suncon] but too may use that marking pattern to say for sure.
[Sanyo sold their Lytics division in Apr 2009.]
http://www.altec-ag.ch/ger/News/Lett...etter_0409.pdfMann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: 4v caps?
> Nichicon had an announcement on their site a while back stating they intended to switch some of their old lytic series' to direct marking instead of sleeves but I can't find it anymore and I haven't seen any marked that way on newer stuff yet.
Nichicon HD and MJ, among others, have been available in clear-lacquer on bare aluminium with black printed text. Many of their SMT series also have the same finish.Comment
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Re: 4v caps?
It's hard to see the "K" in the picture, but I think Sacon uses a similar vent.
The Rubycon "K" looks like a real K - all 3 lines meeting at a point.
The Sanyo "K" isn't really a K. One of the legs intersects halfway up the other.
From what I've seen, I think Sacon is in between Sanyo and Rubycon style. They look similar without being an exact copy:
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
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I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,... -
Good evening
I recently aquired a rev 1.1 Gigabyte 60XT, and was suprised of the amount of leaking caps for a motherboard of the P3 era. Especially the way the 330µf caps seems like the housing discolored even.
Now, there are some 3300µF 6.3V KZG series around the CPU. Would it be OK to replace them with something like EEUFR1A332 ? (Panasonic FR 3300µF 10V). Or was this board designed around very low ESR caps?
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Could it be they used 25V caps because they were cheaper / available at that time?...
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