Does this transformer look bad? Photo attached

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  • mitsu2k
    Senior Member
    • Aug 2013
    • 199
    • USA
    #1

    Does this transformer look bad? Photo attached

    This is a transformer on a subwoofer plate amplifier. I see what appears to be resin all over it. Appears almost like it has heated and leaked out or it could be from manufacturing?. The amplifier keeps blowing fuses. I did identify a blown Mosfet but I am also questioning the state of this transformer. Any insight please? Thank you!
    Attached Files
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    • Per Hansson
      Super Moderator
      • Jul 2005
      • 5895
      • Sweden
      #2
      Re: Does this transformer look bad? Photo attached

      The transformer is normal, it is just varnish to stop the transformer from creating annoying audible oscillation noises.

      The yellow glue though might very well be your problem, see attached photos.
      It becomes conductive with age, known problem for 20 or 30 years.
      Ask the manufacturer why they keep using it...
      Attached Files
      "The one who says it cannot be done should never interrupt the one who is doing it."

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 7972
          • Canada
          #3
          Re: Does this transformer look bad? Photo attached

          This yellow / brown glue, remove on sight. It either causing you trouble or going to cause trouble.

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6018
              • USA
              #4
              Re: Does this transformer look bad? Photo attached

              Originally posted by mitsu2k
              This is a transformer on a subwoofer plate amplifier. I see what appears to be resin all over it. Appears almost like it has heated and leaked out or it could be from manufacturing?. The amplifier keeps blowing fuses. I did identify a blown Mosfet but I am also questioning the state of this transformer. Any insight please? Thank you!
              Can you please show a picture of the complete circuit board

                Comment

                • mitsu2k
                  Senior Member
                  • Aug 2013
                  • 199
                  • USA
                  #5
                  Re: Does this transformer look bad? Photo attached

                  Originally posted by sam_sam_sam
                  Can you please show a picture of the complete circuit board
                  Here is a picture of the complete board but I have already removed the caps and the mosfets. I found two of the 47uf 50v caps to have high ESR (One 8ohms and the other 33ohms). The other caps were within spec but I am replacing them all anyway. I scraped off the glue in the areas where it appeared to be making a bridge between two or more points. What I noticed is the glue was only conductive where heat had turned it a dark brown. It was easy to flake off where it had darkened but a real pain where it's a lighter color. I thought I would just leave those areas but cut out the areas that bridged other component legs or traces.
                  Attached Files
                  Last edited by mitsu2k; 01-08-2023, 04:51 PM.

                    Comment

                    • stj
                      Great Sage 齊天大聖
                      • Dec 2009
                      • 30917
                      • Albion
                      #6
                      Re: Does this transformer look bad? Photo attached

                      it's not just conductive, it's corrosive and can eat through wires!

                        Comment

                        • mitsu2k
                          Senior Member
                          • Aug 2013
                          • 199
                          • USA
                          #7
                          Re: Does this transformer look bad? Photo attached

                          Originally posted by stj
                          it's not just conductive, it's corrosive and can eat through wires!
                          Thank you, do you know of a trick to easily remove it? Also would replacing it with hot glue melt be acceptable to keep components from vibrating loose?

                            Comment

                            • stj
                              Great Sage 齊天大聖
                              • Dec 2009
                              • 30917
                              • Albion
                              #8
                              Re: Does this transformer look bad? Photo attached

                              you dont need to replace it,
                              as for removing it, some people say IPA will loosen it - i just go at it with small longnose pliers and a flat screwdriver!

                                Comment

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