FLUKE 43B PM8907 power supply repair

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  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA
    #1

    FLUKE 43B PM8907 power supply repair

    Have two dead out of four power supply for (4) FLUKE 43B.
    The resistance reading on the two power prongs shows open circuit.
    Open up the module, you will need security bit, and found hair line crack on the circuit board. Too bad that FLUKE did not spec in fiberglass PCB to build this power supply.
    Fixed the broken traces and added epoxy to the PCB to help supporting the board.
    Attached Files
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809
    Tags: None
    • mmartell
      Badcaps Legend
      • Oct 2013
      • 3189
      • Canada
      #2
      Re: FLUKE 43B PM8907 power supply repair

      Good eye, bud.

        Comment

        • mockingbird
          Badcaps Legend
          • Dec 2008
          • 5484
          • -
          #3
          Re: FLUKE 43B PM8907 power supply repair

          Hope you swapped out that "Stone" brand cap. They have all the longevity of a croissant at a feminist buffet.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: FLUKE 43B PM8907 power supply repair

              Power supply is made in Germany with lousy cap. The replacement power supply is around $100.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: FLUKE 43B PM8907 power supply repair

                  Very disappointing for Fluke. Then again, after seeing CapXon in a Tektronix signal generator, I'm not too surprised.

                  My Rigol scope uses Epcos caps, even though it is made and designed in China, they are OK caps. Not the best, but far from the worst...
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • mockingbird
                      Badcaps Legend
                      • Dec 2008
                      • 5484
                      • -
                      #6
                      Re: FLUKE 43B PM8907 power supply repair

                      Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: FLUKE 43B PM8907 power supply repair

                          Originally posted by mockingbird
                          Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.
                          EPCOS are one of the largest manufacturers of capacitors primarily used in industrial and hi rel applications where the Japanese brands don't fill the market and they also cost a little less. For example they're a lot better at higher temperatures - the water electrolyte in the Japanese caps can boil off at high temperatures, reducing reliability.

                          I have reasonable confidence in them. I doubt they're as good as a Rubycon or Panasonic, but I wouldn't call them unreliable. I've never seen one go bad.
                          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                            Comment

                            • ben7
                              Capaholic
                              • Jan 2011
                              • 4059
                              • USA
                              #8
                              Re: FLUKE 43B PM8907 power supply repair

                              Originally posted by mockingbird
                              Epcos is not a reliable brand. I've seen Dave Jones claim they are, but he's wrong.
                              Like tom, I've never even heard of them going bad? Have you?!
                              Muh-soggy-knee

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271
                                  #9
                                  Re: FLUKE 43B PM8907 power supply repair

                                  Thanks for sharing. I'm surprised they are made in Germany and not China.
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                                    Comment

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