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replacing caps in a PSU, same spec, different size?

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    replacing caps in a PSU, same spec, different size?

    I just had a PSU crap out on me. Took it apart and found three fujjiyu 1000uf 10v caps that had gone bad. Looking in my parts bins, I found that I have three unused Sanyo 1000uf 10v caps, however they're physically smaller than the fujjiyu caps. Can I safely replace the larger caps with these smaller caps? I've never done a swap with smaller caps before and I'm hesitant to do it.

    #2
    Re: replacing caps in a PSU, same spec, different size?

    if the ESR is similar.
    the size is not important providing they will fit.

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      #3
      Re: replacing caps in a PSU, same spec, different size?

      Originally posted by stj View Post
      if the ESR is similar.
      the size is not important providing they will fit.
      ugh... I can't find any information on these Fuhjyyu caps (misspelled the name earlier). If the ESR is a mismatch, what's the worst that can happen?

      Comment


        #4
        Re: replacing caps in a PSU, same spec, different size?

        It depends how far off it is and how tolerant the PSU's feedback circuit is. It may work just fine, or it might make the ripple worse.
        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


          #5
          Re: replacing caps in a PSU, same spec, different size?

          fuckyou - the manufacturer.
          http://www.fuhjyyu.com.tw/

          Comment


            #6
            Re: replacing caps in a PSU, same spec, different size?

            That's can mess it up? I just did this on my moms psu for her computer. There were 3 bulged. I had same spec ones to and it still had the same problem after.

            Comment


              #7
              Re: replacing caps in a PSU, same spec, different size?

              so the problem was deeper and the bad caps didnt cause the problem.

              what's the symptoms.

              Comment


                #8
                Re: replacing caps in a PSU, same spec, different size?

                Originally posted by stj View Post
                fuckyou - the manufacturer.
                http://www.fuhjyyu.com.tw/
                ugh... figures their documentation doesn't give a value for ESR.

                Comment


                  #9
                  Re: replacing caps in a PSU, same spec, different size?

                  If that's the case, they are probably GP caps (not low ESR caps). If that's the case, I usually use Panasonic FC, Nichicon PW, NCC LXZ, Ruby YXF or something like that. You might get away with lower ESR than that or you might not. It depends a lot on the design of the PSU.
                  Last edited by c_hegge; 05-30-2014, 03:54 AM.
                  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


                    #10
                    Re: replacing caps in a PSU, same spec, different size?

                    Yeah, they're the TN series general purpose caps.

                    The PSU is a cheapie 300W PSU I picked up years ago, but it's the only one I have available that has a 12V P4 connector on it and the machine it was used in was still in service.

                    BAH... Guess I'll need to look into different caps.

                    Comment


                      #11
                      Re: replacing caps in a PSU, same spec, different size?

                      Assuming the original Fooljyyu's were 10mm diameter, any one of the following would work:

                      http://www.digikey.com/product-detai...0225-ND/266235 (Panny FC)
                      http://www.digikey.com/product-detai...877-ND/3563691 (Ruby YXF)
                      http://www.digikey.com/product-detai...1746-ND/589487 (Nichicon PW)
                      http://www.digikey.com/product-detai...1905-ND/756421 (Chemi-con LXZ)
                      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


                        #12
                        Re: replacing caps in a PSU, same spec, different size?

                        Rubycon ZL, ZLH or ZLG are worth considering - the ZLH is available in 1500uF/10V/8mm that fits in some fairly tight spots.

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