Siemens induction panel PCB burnt

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  • jm1234
    Senior Member
    • Jan 2024
    • 64
    • Slovakia
    #1

    Siemens induction panel PCB burnt

    Hi,
    this is a Siemens induction panel, one side seems damaged, I attached both good and burnt picture to compare. I'm not sure what those rectangles a are for, but they are connected by a solder. That seems to be what got burnt, so I'm wondering it that was some kind of a protection. Do I just try to re-solder them?
    Thanks,
    Daniel
    Attached Files
    Tags: None
    • SMDFlea
      Super Moderator
      • Jan 2018
      • 21853
      • UK
      #2
      Originally posted by jm1234
      Hi,
      this is a Siemens induction panel, one side seems damaged, I attached both good and burnt picture to compare. I'm not sure what those rectangles a are for, but they are connected by a solder. That seems to be what got burnt, so I'm wondering it that was some kind of a protection. Do I just try to re-solder them?
      Thanks,
      Daniel
      Post pictures of the other side of the board,and the part numbers
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

        Comment

        • jm1234
          Senior Member
          • Jan 2024
          • 64
          • Slovakia
          #3
          Nothing visibly obvious on the other side of the board, I'm attaching the picture. The only 2 protruding legs visible on those burnt rectangles belong to the blue capacitor (2u2) and the round brown capacitor just next to it
          Not sure if the part number is what's shown on the other picture but hoping it is.
          Attached Files

            Comment

            • Per Hansson
              Super Moderator
              • Jul 2005
              • 5895
              • Sweden
              #4
              On the PCB there is the writing F2 so perhaps it is a PCB fuse? If so you probably have a short somewhere else...
              "The one who says it cannot be done should never interrupt the one who is doing it."

                Comment

                • jm1234
                  Senior Member
                  • Jan 2024
                  • 64
                  • Slovakia
                  #5
                  Originally posted by Per Hansson
                  On the PCB there is the writing F2 so perhaps it is a PCB fuse? If so you probably have a short somewhere else...
                  So that's what I'm trying to understand. Besides finding the root cause, I'm curious about that burnt solder. Once I find and fix the root cause, do I just re-solder those burnt connections? If they indeed were designed as a fuse of a kind, I imagine their function would very much depend on the kind and amount of solder I would put there.
                  Thanks

                    Comment

                    • Per Hansson
                      Super Moderator
                      • Jul 2005
                      • 5895
                      • Sweden
                      #6
                      I don't think it is possible to recreate it with enough precision, but it was just made as a cost measure: you could substitute it with a real ceramic fuse, however knowing the intended value would probably require a schematic...
                      "The one who says it cannot be done should never interrupt the one who is doing it."

                        Comment

                        • lotas
                          Badcaps Legend
                          • Jan 2016
                          • 4785
                          • Russia
                          #7
                          Check the diode bridge and IGBT transistors for short circuit.
                          Attached Files

                            Comment

                            • jm1234
                              Senior Member
                              • Jan 2024
                              • 64
                              • Slovakia
                              #8
                              Originally posted by lotas
                              Check the diode bridge and IGBT transistors for short circuit.
                              Right on the money, this is what I checked earlier this morning and 2 of the 4 transistors are shorted. The diode bridge seems fine.
                              Thanks
                              Daniel

                                Comment

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