tc-p50gt30

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  • ricosavy
    Badcaps Veteran
    • Jul 2012
    • 457
    • united states
    #1

    tc-p50gt30

    My is sc board is shorting out replaced the 30f131 and rf1501 .Soon as i turn the tv on it shorts out.So what i did was put a light bulb in power cord when i turn tv on it lights on for a sec or two and tv shouts off.I disconnect the sc board from power supply and bulb lights up.Also disconnect the ss board and bulb still lights up.When i disconnect Ps2 on power supply the bulb does not light up and gets a 8blink code.I was wondering if my power supply is shorted.Looks like that supplies power to sc board.
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    • ricosavy
      Badcaps Veteran
      • Jul 2012
      • 457
      • united states
      #2
      Re: tc-p50gt30

      the bulb i am using is 100w is that ok .

        Comment

        • Unspun01
          Badcaps Veteran
          • Jun 2011
          • 333
          • Canada
          #3
          Re: tc-p50gt30

          Upload photos of YOUR SC board with YOUR repairs.

          Which 30F131 IGBTs did you replace?

          There are usually 6 that burn out together Q401, Q402, Q403 and Q421, Q422, Q423. The diodes do not usually need to be replaced but may come in some kits. I have never had a diode fail in any of the TNPA5335 SC boards I've fixed.

          I don't recall seeing the three 30F131 at positions Q621, Q622, Q623 fail so I usually leave them alone if they test ok.

          Please reply with answers to my questions. I'm concerned you did not replace the correct IGBTs, or there may be more shorts that are still on the board.

            Comment

            • ricosavy
              Badcaps Veteran
              • Jul 2012
              • 457
              • united states
              #4
              Re: tc-p50gt30

              I replaced the ones you mentioned and the diodes but soon as it turns on I hear a poping noise they short out.

                Comment

                • Unspun01
                  Badcaps Veteran
                  • Jun 2011
                  • 333
                  • Canada
                  #5
                  Re: tc-p50gt30

                  Again, please upload photos of YOUR board, and YOUR repair.

                  Did you replace all 6 IGBTs? Q401, Q402, Q403, Q421, Q422, Q423?

                  Are the IGBTs at Q621, Q622, Q623 ok?

                  Something is wrong. Re-test all transistors and diodes on the board before re-installing new ones. I think you might have missed other shorts that are on this board which caused re-failure.

                  Check also the low resistance gate resistors for each IGBT. I think they are 7.5ohm. If any are open then you need to replace.

                    Comment

                    • tvtimmy
                      Badcaps Legend
                      • Mar 2015
                      • 1160
                      • usa
                      #6
                      Re: tc-p50gt30

                      Don't count out the possibility of using fake parts.

                        Comment

                        • ricosavy
                          Badcaps Veteran
                          • Jul 2012
                          • 457
                          • united states
                          #7
                          Re: tc-p50gt30

                          Well after replacing transistors 3 times and them shorting out every time I powered the tv on.I checked resistors 8 ohms and also had replaced ic driver and transistor.I checked all caps,diodes and resistors they all tested good.
                          Saw tvtimmy on fake ones,tried another batch I have bought few months earlier they looked like better quality.Used them and the Sc board turn tv no more poping noise.Weird thing is a bought them from same supplier probably bad batch or fake.
                          Thanks for all your help.Tv is now working.

                            Comment

                            • tvtimmy
                              Badcaps Legend
                              • Mar 2015
                              • 1160
                              • usa
                              #8
                              Re: tc-p50gt30

                              Can you post a pic of the bad and the good?

                                Comment

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