MS-7255 v1.0 Bad Cap

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  • smata67
    Member
    • May 2006
    • 14
    #1

    MS-7255 v1.0 Bad Cap

    I found a bulging cap near the power connector on this board. It is above the cap I'm measuring in the picture, you can see the empty spot for it on the board. It is a 470uF/16v made by G-Luxon. It is an LZ (low impedance/high frequency) cap. I removed it and took an esr reading. As you can see in the pic, 2.2 which is about 10 times the .2 or so value you would expect in a typical electrolytic, would be lower in one of this spec. I was not experiencing any problems, but decided to fix it anyway. Desoldering this particular cap was tough because it is on the ground plane which sucks the heat. I would suggest tackling this job with good equipment, not a cheap RS pen type, would most likely damage the board. Replace with a good quality cap, if you go to the Luxon site, they give some recommendations for similar caps of other manufacturers in their substitution table.
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    • Wizard
      Badcaps Legend
      • Mar 2008
      • 2296
      #2
      Re: MS-7255 v1.0 Bad Cap

      What's markings on the other capacitors if they are OST, G-luxon etc time for full recap but be advised that chipset is VIA. Notorious for problems, best consider getting another board that uses Intel chipset and rebuild it instead.

      PS on this MSI board:
      Get the northbridge chipset heatsink off, make sure it is heatsink compound not double sided sticker (semi-transprant) which is not a thermal sticker.

      Cheers, Wizard

        Comment

        • PCBONEZ
          Grumpy Old Fart
          • Aug 2005
          • 10661
          • USA
          #3
          Re: MS-7255 v1.0 Bad Cap

          ESR is more like 24-25x what is should be.
          Data sheet for G-Luxon LZ 470uF/16v shows ESR at 0.093 for the 8mm and 0.085 for the 10mm.
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            Comment

            • Wizard
              Badcaps Legend
              • Mar 2008
              • 2296
              #4
              Re: MS-7255 v1.0 Bad Cap

              And too high still even new for G-luxon capacitors. Tested ESR should be around .04 or less and v-core should be around .02 or less for each capacitor and of high current ripple rating.

              Cheers, Wizard

                Comment

                • 370forlife
                  Large Marge
                  • Aug 2008
                  • 3112
                  • United States
                  #5
                  Re: MS-7255 v1.0 Bad Cap

                  HA HA HA HA!!!

                  G-luxon...

                  FAIL

                    Comment

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