Recapping Abit BG7m with polymer

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  • Barchetta
    New Member
    • Oct 2011
    • 2

    #1

    Recapping Abit BG7m with polymer

    My decade old Abit 478 pin P4 533 MHz FSB board finally ceased to function reliably and killed its ATX power supply. Visual inspection revealed eight 2200uF 6.3V HM(M) HD147 Nichicons bulging/leaking (and two empty spaces) near the processor, and one lonely 1000uF 10V HM(M) HD139 Nichicon bulging (and one empty space) near the ATX power connector. The other smaller caps appear ok.

    After some research (mainly badcaps.net and this forum), I ordered 10 Nichicon 1800uF 6.3V polymer caps and 2 Nichicon 820uF 10V polymer caps from Digi-Key.

    I could not find the ESR and ripple of the originals for comparison (I obviously don't know where to look) so I just settled on 82% of the original capacitance, the same voltage, and ordered enough polymer caps to fill the empty spaces. I decided to use polymer because it seems more interesting than returning the board to original specs.

    The board would have very little value to me even if I fixed it (it's the slowest of the seven computers in the house), so this is more for my own entertainment (and I might learn something - like how inadequate my soldering skills are).

    Will the caps I ordered work? or at least not burn the house down?

    Filling the empty spaces seems like a good thing, I figure the spaces are there due to "cost improvement". Any reasons I shouldn't do this? What are the effects of adding parallel caps?

    Is there anything I can measure with a multimeter or 30MHz oscilloscope (I know - it's like WWII era) to quantify my results (if any)?

    I have a basic plan of what I'd like to do, but I am open to suggestions or warnings of impending doom!
  • c_hegge
    Badcaps Legend
    • Sep 2009
    • 5219
    • Australia

    #2
    Re: Recapping Abit BG7m with polymer

    Those caps should be fine. I'd fill up the empty spaces as well. I've done that a few times before.
    I love putting bad caps and flat batteries in fire and watching them explode!!

    No wonder it doesn't work! You installed the jumper wires backwards

    Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

    Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

    Comment

    • Barchetta
      New Member
      • Oct 2011
      • 2

      #3
      Re: Recapping Abit BG7m with polymer

      I had been trying to do a clean install of XP before this repair; it passed the point where it was hanging with 33 mins. to go and completed the install. It was rebooting alot so I figured it didn't survive my soldering. Since half of the previous install was with the bad caps I started over.

      XP is now installed with all the updates. I think the security updates could be considered a burn-in test just because of the number of them. I'm still having the same trouble with the dvd rom drive, where it works just fine for the XP installation only. Once XP starts, dvd access gives errors or fully locks the OS.

      I've been running memtest for almost three hours with no errors, and nothing has exploded! Yet.

      Comment

      • silvergoat
        Senior Member
        • Oct 2011
        • 53

        #4
        Re: Recapping Abit BG7m with polymer

        How do you know what type of capacitor to add into the empty spaces?

        Comment

        • Th3_uN1Qu3
          Believe in
          • Jul 2010
          • 6031
          • Romania

          #5
          Re: Recapping Abit BG7m with polymer

          They're in parallel so you just add more of what's already there.
          Originally posted by PeteS in CA
          Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
          A working TV? How boring!

          Comment

          • PCBONEZ
            Grumpy Old Fart
            • Aug 2005
            • 10661
            • USA

            #6
            Re: Recapping Abit BG7m with polymer

            Originally posted by Th3_uN1Qu3
            They're in parallel ....
            Not always.
            You have to check.
            .
            Mann-Made Global Warming.
            - We should be more concerned about the Intellectual Climate.

            -
            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
            -
            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.
            -

            Comment

            • PCBONEZ
              Grumpy Old Fart
              • Aug 2005
              • 10661
              • USA

              #7
              Re: Recapping Abit BG7m with polymer

              The "eight 2200uF 6.3V HM(M) HD147"
              is actually:
              - eight 2200uF 6.3V HM(M) H0147
              That's 2001, week 47 and part of the defective production run.
              .
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.

              -
              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
              -
              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.
              -

              Comment

              • PCBONEZ
                Grumpy Old Fart
                • Aug 2005
                • 10661
                • USA

                #8
                Re: Recapping Abit BG7m with polymer

                Originally posted by Barchetta
                My decade old Abit 478 pin P4 533 MHz FSB board finally ceased to function reliably and killed its ATX power supply. Visual inspection revealed eight 2200uF 6.3V HM(M) HD147 Nichicons bulging/leaking (and two empty spaces) near the processor, and one lonely 1000uF 10V HM(M) HD139 Nichicon bulging (and one empty space) near the ATX power connector. The other smaller caps appear ok.

                After some research (mainly badcaps.net and this forum), I ordered 10 Nichicon 1800uF 6.3V polymer caps and 2 Nichicon 820uF 10V polymer caps from Digi-Key.

                I could not find the ESR and ripple of the originals for comparison (I obviously don't know where to look) so I just settled on 82% of the original capacitance, the same voltage, and ordered enough polymer caps to fill the empty spaces. I decided to use polymer because it seems more interesting than returning the board to original specs.

                The board would have very little value to me even if I fixed it (it's the slowest of the seven computers in the house), so this is more for my own entertainment (and I might learn something - like how inadequate my soldering skills are).

                Will the caps I ordered work? or at least not burn the house down?

                Filling the empty spaces seems like a good thing, I figure the spaces are there due to "cost improvement". Any reasons I shouldn't do this? What are the effects of adding parallel caps?

                Is there anything I can measure with a multimeter or 30MHz oscilloscope (I know - it's like WWII era) to quantify my results (if any)?

                I have a basic plan of what I'd like to do, but I am open to suggestions or warnings of impending doom!
                I wouldn't bother with polys outside the VRM.
                Doesn't get you much unless you have heat issues.
                -
                With good Polys [ESR under .010], as long as the total uF in Vcore is 5500uF or more and you use 7 or more poly [for combined ESR] - you should be fine.
                That is what it typically used on factory 'poly boards'.
                Some boards do okay with less but you have plenty of caps 'spots' available so don't skimp.
                [8x 820uF would be a great way to go.]
                -
                For the 16v VRM caps 3x 470uF or 4x 330uF works fine.
                .
                Historically with lytics they over-kill the uF in VRM's.
                It's not about the uF, they used those caps to get the ESR lower.
                .
                Last edited by PCBONEZ; 10-28-2011, 11:15 AM.
                Mann-Made Global Warming.
                - We should be more concerned about the Intellectual Climate.

                -
                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
                -
                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.
                -

                Comment

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