KZG cap bulged sitting in the attic

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  • goodpsusearch
    Badcaps Legend
    • Oct 2009
    • 2850
    • Greece
    #1

    KZG cap bulged sitting in the attic

    The motherboard is an Intel D845PESV and it was not in use since August 2011, (all the caps were ok at that time).

    Today I opened the PC case to take the speaker and noticed that 1 of the 3 KZGs was in very bad condition.

    I know that during hot summer days the temperature in the attic can reach 43Celsius, but I never could imagine that the electrolyte of KZG would break down by itself.

    Anyway, I recapped with used Rubycon MBZ that I took out from another -dead- Intel D845PESV mobo.
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    • Uranium-235
      Comrade Glimmer
      • Aug 2007
      • 5042
      • US
      #2
      Re: KZG cap bulged sitting in the attic

      yup, sometimes the forumlas can be so messed up (especially with KGZ series) they can bloat under 85c

      heat by itself CAN bloat a cap with no electricity required too. Get a heatgun, put it on high and aim it at any boards caps, and they will vent thier forumla right there
      Cap Datasheet Depot: http://www.paullinebarger.net/DS/
      ^If you have datasheets not listed PM me

        Comment

        • japlytic
          Badcaps Legend
          • Oct 2005
          • 2086
          • Australia
          #3
          Re: KZG cap bulged sitting in the attic

          I found that used low-ESR OST capacitors placed in storage (not bulging) did bulge after some time, even though no energy was applied to them.
          Also, I have seen unused Chemi-Con KZJ units bulge after some time.
          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

            Comment

            • PeteS in CA
              Badcaps Legend
              • Aug 2005
              • 3579
              • USA, Unsure of Planet
              #4
              Re: KZG cap bulged sitting in the attic

              I was out of circulation for several years ... did NCC/UCC poo the screwch with the KZG and KZJ series?
              PeteS in CA

              Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
              ****************************
              To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
              ****************************

                Comment

                • Rulycat
                  Badcaps Veteran
                  • Apr 2010
                  • 724
                  • United Kingdom
                  #5
                  Re: KZG cap bulged sitting in the attic

                  I believe they used some new iron-based formula which didn't work out. OR something like that.

                    Comment

                    • Per Hansson
                      Super Moderator
                      • Jul 2005
                      • 5895
                      • Sweden
                      #6
                      Re: KZG cap bulged sitting in the attic

                      PeteS in CA; Yup

                      Rulycat; Very interesting, before reading your comment I thought to myself that the crap out of that KZG looks like rust!
                      "The one who says it cannot be done should never interrupt the one who is doing it."

                        Comment

                        • PeteS in CA
                          Badcaps Legend
                          • Aug 2005
                          • 3579
                          • USA, Unsure of Planet
                          #7
                          Re: KZG cap bulged sitting in the attic

                          I would love to learn how something that bad survived UCC's engineering test processes. Test processes should take parts being test through spec'ed conditions and beyond, so the parts' behavior is understood well before the first production parts reach customers.
                          PeteS in CA

                          Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
                          ****************************
                          To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
                          ****************************

                            Comment

                            • Per Hansson
                              Super Moderator
                              • Jul 2005
                              • 5895
                              • Sweden
                              #8
                              Re: KZG cap bulged sitting in the attic

                              Yea it's strange, the ones I've seen like these have been used for years before the failure though.
                              So maybe that is the reason, they only realized untill it was already too late?
                              "The one who says it cannot be done should never interrupt the one who is doing it."

                                Comment

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