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bad 820uF 6.3v caps in HP pavilion a867c PC

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    bad 820uF 6.3v caps in HP pavilion a867c PC

    A few weeks ago I changed some of the memory modules from 1/2 gig to 1gigs. To now have 3 gigs of ram. Well, now the system would occasionally freeze. Bad new memory? Maybe some SW I've been running doesn't play nice in the system? Well, I decided to pull the new memory and replace it with the old ones. But I noticed a pair of green "Ltec" 820uF 6.3v caps had bulging tops. Right near the memory. Got out the tools and soldering iron, and found a couple of 1000uF 10v caps 105C as replacements. Noted which circuit board hole gets the negative side. Put the system back together and it still works. Though it's too early to declare success, as the freezes happened every several days... I did check the old caps with a cap meter, they measured less than 0.1uF. Looking closely at the bulged tops I can see a crack.

    All the other caps look fine, no bulges or leaking crap (at least I can't see it if there is any).

    I bought this PC new in 2005.

    #2
    Re: bad 820uF 6.3v caps in HP pavilion a867c PC

    Is this your board?

    http://images.esellerpro.com/2131/I/719/31/5187.jpg

    Lots of re-capping to do. Starting with those 8mm KZG series cap in the VRM high.
    "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

    -Leonid Brezhnev (On the Yom Kippur War)

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      #3
      Re: bad 820uF 6.3v caps in HP pavilion a867c PC



      The caps I arrowed in your mb picture and my picture of my mb are the ones I replaced. The replacements are 1000uF 10V 105C. And about twice the physical size as the old ones.

      The bad caps:


      The system's been stable since my last post last week.
      Attached Files

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        #4
        Re: bad 820uF 6.3v caps in HP pavilion a867c PC

        Don't put a better CPU in there. The moment you put some stress on it with a higher TDP requirement, the weakness in the caps you didn't replace will manifest. KZG can last for years working at half their capacitance and out of their ESR spec as long as the power demanded from them is a fraction of what they're rated for.
        "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

        -Leonid Brezhnev (On the Yom Kippur War)

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          #5
          Re: bad 820uF 6.3v caps in HP pavilion a867c PC

          I believe this mobo has GSC caps on it too....

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