Date: Wed, 29 Jan 2003 18:27:52 -0800 From: Peter Wemm <peter@wemm.org> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Dale Woolridge <dale-list-freebsd-smp-2@woolridge.org>, freebsd-smp@FreeBSD.ORG Subject: Re: Over heating of the ABit BP6 motherboard Message-ID: <20030130022752.1872F2A89E@canning.wemm.org> In-Reply-To: <200301270812.h0R8Cl8g072290@apollo.backplane.com>
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Matthew Dillon wrote:
> : as the reported EC10 cap problem. As far as I know, simply replacing
> : the 1000uF/10v caps with non-Jackcon ones is sufficient. As per reports
,
> : I'll replace EC10 with a 1500uF/6.3v cap. I'll send out another note on
ce
> : my changes are complete (reporting success/failure).
> :
> : Regarding the VP6 cap problem, some people have replaced their own caps
> : with caps of the same uF/v rating. Others, who have gone the RMA route
> : with the VP6, had their caps replaced with altogether different ones,
> : although I can't recall the uF/v rating on the new caps.
> :--
> :-Dale
>
> Has anyone measured the voltage across those caps? If they are
> electrolytic it's generally a good idea to put a significantly
> higher voltage rating in verses the nominal voltage across the cap
> (they'll last a lot longer). I am somewhat worried that the original
> caps were 10v rated and you are replacing them with 6.3v rated.
The voltage spikes are the kicker, aren't they? In my research for the
dead Apple Airport problem (caps swelling up), somebody reported that the
spikes he was seeing were way above the nominal rating of the capacitor.
Although the input is 12V, and the caps were rated at 16V, he ended up using
25V caps because of the spikes. I did the same on mine.
I suspect I have the same problem on my 8 port switches at home. Two of
the three have now had an exploded electrolytic capacitor and subsequently
shorted out the external power wall transformer and killed it. Collecting
up the bits of the capacitor and replacing it solved the problem, but
I'm not sure if I want to keep losing the power supplies.
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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