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Which cap to replace kzg - Biostar AF4ST-A9

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    #1

    Which cap to replace kzg - Biostar AF4ST-A9

    I have Biostar NF4st-A9 socket 939 motherboard which our kids use.
    Its been working great for many years.
    Recently when using, the PC just freezes randomly which then requires the power to be switched off to reboot.
    Thought originally that the PSU was failing so tried with a spare PSU. When replacing the PSU i did notice that one of the KZG 3300uf 6.3v caps by the CPU looked very slightly domed on top.
    Tried the spare good PSU to test and the same problem is there.
    Pretty sure now that the caps near the cpu maybe bad.

    The motherboard also has some 1500uf 16v KZG caps which appear to be ok.

    I would be grateful for some advice on which caps to use to replace the 5 - 3300uf 6.3v and 3 - 1500uf 16v KZG caps. Basically looking for good quality caps to be purchased from badcaps.net to be shipped to UK.

    I have done some re-caps before and do have the esrmicro v4 for testing when the old caps are removed.

    Sorry about the poor photo. The domed cap is not shown as its the 5th cap which didn't show on the photo.

    Many thanks
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    #2
    Re: Which cap to replace kzg - Biostar AF4ST-A9

    You could try the search facility?

    https://www.badcaps.net/forum/showth...271#post237271
    Please upload pictures using attachment function when ask for help on the repair
    http://www.badcaps.net/forum/showthread.php?t=39740

    Comment

      #3
      Re: Which cap to replace kzg - Biostar AF4ST-A9

      OK
      I was hoping for advice with regards to series, similar esr and size.
      Any advice would be gratefully appreciated.
      I also would like to buy from badcaps.net to show my support

      Comment

        #4
        Re: Which cap to replace kzg - Biostar AF4ST-A9

        Originally posted by bp1 View Post
        OK
        I was hoping for advice with regards to series, similar esr and size.
        Any advice would be gratefully appreciated.
        I also would like to buy from badcaps.net to show my support
        There is only one choice for 3300uF 6.3V

        https://www.badcaps.net/store/produc...roducts_id=142

        Same for 1500uF 16V

        https://www.badcaps.net/store/produc...roducts_id=139

        HZ easily exceeds KZG specs as per



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          #5
          Re: Which cap to replace kzg - Biostar AF4ST-A9

          Originally posted by retiredcaps View Post
          There is only one choice for 3300uF 6.3V

          https://www.badcaps.net/store/produc...roducts_id=142

          Same for 1500uF 16V

          https://www.badcaps.net/store/produc...roducts_id=139

          HZ easily exceeds KZG specs as per


          Many thanks for your post and advice.

          Did loads of searching and reading on posts last night but was still a little unsure.
          I have placed order for the HZ series ones recommended from badcaps.net

          Must say the delivery cost seems very good for international post.

          Thanks for your time in helping - Very much appreciated

          Comment

            #6
            Re: Which cap to replace kzg - Biostar AF4ST-A9

            Just remember that all KZG caps on the board should be replaced. they often go bad with no visible signs.
            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

              #7
              Re: Which cap to replace kzg - Biostar AF4ST-A9

              The new HZ series caps arrived a couple of days ago from badcaps. From order to delivery to the UK was 8 days. Very happy with ordering from badcaps.

              I took the old KZG caps out. I wanted to test all the caps removed. Unfortuntatly the vented cap was difficult and one of the legs broke. I was therefore unable to test this cap.
              The other removed caps all tested OK with the esrmicro.
              Also had a few problems with unblocking the holes on the motherboard. I was using a 60W soldering iron but still struggled a little. Eventually i was succeful with a new solder sucker and dental tooth picks.
              The new caps are all in now. So far the Biostar NF4st-A9 socket 939 motherboard seems to be working with no problems. I have asked the kids to start gaming especially the ones which use to cause problems. So far no problems encounted.

              Hopefully the bloated cap was the one which caused the problems but now with replacing all the KZC caps everything will be ok.

              Thanks for the posts and recommendation for the HZ series caps

              Comment

                #8
                Re: Which cap to replace kzg - Biostar AF4ST-A9

                KGZ's tend to have bad seals, so when the bloating process occurs, they just vent the gas through the bad seals, and they do not show any signs of bloating
                Cap Datasheet Depot: http://www.paullinebarger.net/DS/
                ^If you have datasheets not listed PM me

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