Eric Hidle on 13 Jul 2006 02:47:24 -0000


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Re: [PLUG] OT: SMD capacitor


An electrolytic would be fine, but an SMD would be preferred to a radial....

Polystyrene caps can run $5-$10.... low ESR caps can be a tad much...

It takes a LOT to break a component off of a board. It doesn't happen w/o a lot of force..
E


gyoza@comcast.net wrote:
Thanks. That really narrows it down. I see that Mouser has some for about $2.22 each. (Expensive for caps, isn't it?)

So, I should really avoid a electrolytic cap? I have a 16V, 100uF and 35V, 47uF available. Or should I just return this card to the ebay seller?

I'm still wondering how a component could be knocked off the board at both ends *and* one lead become completed broken off the component. Could a loose heatsink/fan moving about during shipping do that?


Eric Hidle wrote:

Judging from the location, it doesn't look like a DC-DC output cap, but rather a bulk supply cap for the graphics processor. The DC-DC converters are nestled in that jungle of tin cans at the up-end of the board. That said, it could very well be a tantalum... 16VDC is a pretty high voltage for a solid polymer cap in that large a capacitance...


Anyway, check out AVX TPS series caps for a replacement... they're probably available at digikey in onesies... perhaps a TPSD476M016
E




gyoza@comcast.net wrote:
Here are pictures of the capacitor. http://reddragoncanoeclub.org/paul/9600/

The card is just to show the location and relative size of the cap. The only difference is that my cap is black and my board is green. heh.

I was assuming the cap is tantalum.


Eric Hidle wrote:
What package is the bad capacitor in and what chemistry was it? Chances are it was a low-ESR polystyrene or aluminum-polymer cap, in which case you do not want to replace it with just any off-the-shelf tantalum or electrolytic capacitor. The DC-DC converters on video cards are ultra-clean and depend upon a very low amount of resistance in the output caps to minimize ripple.

Was this thing a round tin can?
E

gyoza@comcast.net wrote:
Nevermind. heh. I will try the radial capacitor. (I found #electronics on Freenode.net)

gyoza@comcast.net wrote:
I have a Radeon 9600 Pro video card with a bad surface mount capacitor (C2). I'm not sure of the value of it. It's labeled "47" and "16V" which I read as 47uF, 16V. Does that sound correct? It is a black SMD capacitor with a white end to indicate polarity. The size is roughly 7mm x 3.5mm x 2mm. I need to identify it enough to replace it. Would it be too wacky to use a huge radial capacitor to replace it?
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___________________________________________________________________________

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General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug

___________________________________________________________________________


Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug


___________________________________________________________________________

Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug

___________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug