Msi p4m900m2 (ms-7255)

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  • s_henya
    Badcaps Veteran
    • Jan 2011
    • 480
    • Israel

    #1

    Msi p4m900m2 (ms-7255)

    Hey,

    I have this mainboard, it started reseting itsef every few secs,

    i discoverd there are a few caps that are bulged

    3 1800M/6.3v
    2 1000M/16V
    5 680M 4V

    My suggestion to you NEVER work tired,

    When I took out the caps i havent noticed the are diffrent,

    the look just the same, so i dont know where to put each one,

    P.S have anyone tried using 1000M/6.3V instead of 680M/4V?

    thanks in advanced,

    Shai.
  • c_hegge
    Badcaps Legend
    • Sep 2009
    • 5219
    • Australia

    #2
    Re: Msi p4m900m2 (ms-7255)

    Can we have a picture of the motherboard in question?

    The 680uF caps are probably OST RLA series. MSI often used them. I usually replace them with 560uF polymer capacitors.
    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

    • s_henya
      Badcaps Veteran
      • Jan 2011
      • 480
      • Israel

      #3
      Re: Msi p4m900m2 (ms-7255)

      hey c_hegge,

      first i want to thank you for replying,

      The mainboard is MSI P4M900M2 MS-7255 VER 2.1

      you were correct on the ost 680uf they are from the RLA series,

      maybe the worst caps i've seen...

      do you know anyone in israel that selles them?

      P.S i've added a photo of the mainboard after putting the good caps,

      there are 4 1000uf 16v KZJ
      and 3 1800uf 6.3v KZJ that looks just like the 1000uf/16v

      i cant remember the order of each cap...
      Attached Files

      Comment

      • c_hegge
        Badcaps Legend
        • Sep 2009
        • 5219
        • Australia

        #4
        Re: Msi p4m900m2 (ms-7255)

        I don't know where you can find them in Israel, although there are a lot of sellers that will ship there, including badcaps.net.

        Use these for the 1000uF 16v Chemi-con KZJ caps, use these caps for the 1800uF KZJ caps and use these for the 680uF OST RLA caps.
        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

        • s_henya
          Badcaps Veteran
          • Jan 2011
          • 480
          • Israel

          #5
          Re: Msi p4m900m2 (ms-7255)

          thanks for tips about the caps,

          for 1800uf/6.3vZG i used decon 1800uf/6.3v sh, worked well in the past...

          but i have to find a good replacment for the 680uf/4v and 820uf/4v under the heatsink they tend to bulge

          if i won't find anything in IL i will order online...

          i still dont know what to do about the order of the caps...

          i know for sure that ec18 and ec32 are 1000uf/16v

          ec1020?
          ec1019?
          ec1018?
          ec39?
          ec2?

          maybe some know this board or the main design?

          Comment

          • c_hegge
            Badcaps Legend
            • Sep 2009
            • 5219
            • Australia

            #6
            Re: Msi p4m900m2 (ms-7255)

            If you have to order onw of them here, you might as well order the rest. That way, you know they are the right series for the job and that they are a reliable brand. I've never heard of decon caps before, so they could be another no-name junk brand.

            For the caps you are unsure about, where abouts on the board are they?
            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

            • s_henya
              Badcaps Veteran
              • Jan 2011
              • 480
              • Israel

              #7
              Re: Msi p4m900m2 (ms-7255)

              i've added another photo,

              hope it will be clear...

              i've soldiered new caps just for testing,

              im positive it's not their right place...

              i'm afraid testing it...

              im sure there is some logic where should be 16v and where the 6.3v...
              Attached Files

              Comment

              • kc8adu
                Super Moderator
                • Nov 2003
                • 8832
                • U.S.A!

                #8
                Re: Msi p4m900m2 (ms-7255)

                decon=rat poison.
                btw those 680@4 must be ultra low esr.
                the 560@4 sanyo polys are the best replacement.
                as for the confusion check continuity from the +12 4 pin's yellow leads to the + pads of those larger caps.the ones that lead to the +12 must be 16v.
                save yourself some headaches and order the abovementioned parts.afaik decon does not make anything suitable for motherboards.
                also fill the empty spots around/under the hsf with the polys.
                i have a regular sending these in and using the above parts or equivalents will make it better than new.you can correct the beancounters goof.

                Comment

                • s_henya
                  Badcaps Veteran
                  • Jan 2011
                  • 480
                  • Israel

                  #9
                  Re: Msi p4m900m2 (ms-7255)

                  kc8adu, thanks you so much for the tip,

                  i did find out the right places,

                  the board is back to life,

                  i will take your advice about the grade of caps im using.

                  thanks again...

                  Comment

                  • c_hegge
                    Badcaps Legend
                    • Sep 2009
                    • 5219
                    • Australia

                    #10
                    Re: Msi p4m900m2 (ms-7255)

                    I was about to tell you, but it looks like you figured it out. I have repaired sever similar boards using caps like the ones I suggested. So far, they have all worked after re-caps.
                    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

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