Are these caps really bad? I am thinking no..

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  • fastline
    New Member
    • Oct 2010
    • 9
    #1

    Are these caps really bad? I am thinking no..

    I am working on a motor drive that uses 4 large filter caps on the DC rectification circuit. I originally looked at them and said "oh yeah, lucky find!" I desoldered them and they are testing good. I then removed the top cap wanting to confirm damage and was surprised to find the Al case is not bulged at all. I think the spray stuff they coat the board with simply reacted with the rubber caps and caused them to swell like this.

    Has anyone seen something like this?
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    • mockingbird
      Badcaps Legend
      • Dec 2008
      • 5484
      • -
      #2
      Re: Are these caps really bad? I am thinking no..

      I don't know whether they're good or not, but you're right about the metal not bulging with the plastic. Just plastic bulging signifies nothing.

        Comment

        • Agent24
          I see dead caps
          • Oct 2007
          • 4913
          • New Zealand
          #3
          Re: Are these caps really bad? I am thinking no..

          I've seen some primary capacitors in computer PSUs that had bulging plastic tops. Pushing on them led me to believe that the metal was flat, though

          I have not visually checked under the plastic, or tested ESR or capacitance of them though.
          "Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
          -David VanHorn

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