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Dell Precision 490 Motherboard

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    Dell Precision 490 Motherboard

    I have some bulging caps here
    3 KZJ 2200uf 6.3v, these are the gold caps https://cdn.badcaps-static.com/pdfs/...8ea064adf5.pdf
    i can not tell what the green ones are (edit: sanyo 1500uf 6.3V WF series https://www.badcaps.net/forum/attach...7&d=1313180606 )
    Should i replace them with ones that can handle a higher voltage?

    What should i replace them with?
    Attached Files
    Last edited by evilkitty; 04-22-2018, 09:19 AM.

    #2
    Re: Dell Precision 490 Motherboard

    I found a thread that suggested using the HN series to replace the KZJ series

    another system has some bulging 6.3v WF 820uf and KZJ 1800uf 6.3v 8m diameter (seems to work still)

    So i guess i can use these 2 part numbers: UHN1A222MPD and UHN0J182MPD6TD
    but the 2200uf in discontinued and UHD or UHE series is recommended by Nichicon, so i guess i can use UHD0J222MPD

    but what about the WF caps? i am guessing these are used for the ram based on there location
    WF were supposed to be good caps, i guess the KZJ overworked them?
    Would FR be a good replacement?
    Last edited by evilkitty; 04-22-2018, 11:56 AM.

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      #3
      Re: Dell Precision 490 Motherboard

      Maybe I should replace the Sanyo with these polymer caps:
      https://www.mouser.com/ProductDetail...5MS158M1AAAE13 - 1500uf
      https://www.mouser.com/ProductDetail...5KS827M1AAAE14 - 820uf
      But, the ESR is bit lower
      Stock Sanyo WF 1500uf has 18 mOhms and 2.2A Ripple VS 13 mOhms
      Stock Sanyo WF 820uf has 21 mOhms and 1.3A Ripple VS 14 mOhms
      Ripple is way higher on the polymer caps

      While the numbers on Polymer caps looks great for these, but dat price... (Should I say screw it and get them?)
      https://www.mouser.com/ProductDetail/667-EEU-FM0J222L - 2200uf
      https://www.mouser.com/ProductDetail/647-UHN0J182MPD6TD - 1800uf
      Stock UUC KZJ 2200uf has 11 VS 18 mOhms and 2.92A VS 2.47 Ripple
      Stock UUC KZJ 1800uf has 12 VS 11 mOhms and 2.35A VS 2.22A Ripple

      I could use this for the 2200uf cap: 9 mOhms and 3.19A Ripple
      https://www.mouser.com/ProductDetail/647-UHN1A222MPD
      but it is discontinued... is that a problem?
      How close do i need to be to the stock ESR and Ripple?
      Last edited by evilkitty; 04-22-2018, 02:35 PM.

      Comment


        #4
        Re: Dell Precision 490 Motherboard

        I think I managed to find very close electrolytic caps
        Do those look like good replacements?

        With the WF caps I am only changing the bulging ones (all 3 in the 490 and 2 of 6 in the T3400)
        With the ZKJ caps I am replacing all of them, bulging or not (6 in the 490 and 7 in the T3400)

        Comment


          #5
          Re: Dell Precision 490 Motherboard

          Ones in your last post look excellent.
          I'd also look into the cooling for those FB-DIMM's
          They run very toasty so might be what killed those Sanyo caps...
          "The one who says it cannot be done should never interrupt the one who is doing it."

          Comment


            #6
            Re: Dell Precision 490 Motherboard

            Sanyo’s (Suncon) WF series is failure prone, especially whilst under thermal duress. It’s debatable that heat killed them, but KZJ is a known dud series too and have also failed in these toasty machines. FWIW, those Precision 490 (and 690) boards use MCZ, KZJ, and WF interchangeably in the position that those 1500uF 6.3V caps are in, and thus far I’ve only seen WF and KZJ go bad there. Those T3400 machines (and all Dell motherboards that have a similar layout) also use KZG, KZJ, MCZ, HM (post-2004 datecodes), FL, and WF interchangeably for the 820uF 6.3V caps, and I’ve only seen WF and KZG bulge so far (haven’t seen a 820uF 6.3V KZJ bulge anywhere but in a USFF Dell, but I’ve seen quite a few of them go high ESR with no signs - the larger diameter and/or taller 6.3V KZJs OTOH are more prone to bulging).

            Your replacements look good.
            Last edited by Wester547; 04-23-2018, 01:50 PM.

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              #7
              Re: Dell Precision 490 Motherboard

              Thanks, should I replace all 6 in the t3400?, only 2 are slightly bulging and the system still works
              I do not really care much about the t3400 (it is only 2$ but i am a tight a$$)
              Are the WF caps known to fail without bulging?

              Comment


                #8
                Re: Dell Precision 490 Motherboard

                If two of the six have bulged, the other four may not be far behind. Any capacitor can fail without symptoms, so preemptive replacement is sound.

                Comment


                  #9
                  Re: Dell Precision 490 Motherboard

                  Replace all the Sanyo WF caps. Otherwise, they might (very likely) come back and bite ya again.

                  These Dell workstation PCs are excellent otherwise and worth every $ you invest in them (IMO).

                  Comment


                    #10
                    Re: Dell Precision 490 Motherboard

                    Thanks caps have been ordered, sadly one is on back order... better that not on order and out of stock, hopefully i can to get them installed on/by may 13/12th
                    hopefully that is the only thing wrong with the 490 and there is not some bad smt cap or something

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