panasonic tx-p42gt30b

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  • Jahson
    Badcaps Veteran
    • May 2012
    • 245
    • UK

    #21
    Re: panasonic tx-p42gt30b

    sorry tw2005 if what I was saying isn't clear, could I piggy back the resistor over the connection with original still in place, Connection 1 & 2 just add the 5w or 7w 15ohm resistor on top.

    Comment

    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia

      #22
      Re: panasonic tx-p42gt30b

      Originally posted by Jahson
      sorry tw2005 if what I was saying isn't clear, could I piggy back the resistor over the connection with original still in place, Connection 1 & 2 just add the 5w or 7w 15ohm resistor on top.
      Yeah , I guess, don't know why though. I'd stick to 5W otherwise more energy is going to pass through the 7W before it blows. It may be ok but you're dealing with the mains side of the PSU, exceeding the original design may be risky.

      Comment

      • Jahson
        Badcaps Veteran
        • May 2012
        • 245
        • UK

        #23
        Re: panasonic tx-p42gt30b

        I may of confused you sorry, its not the fuse sided that's blown, its not reading the resistance 15ohms

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia

          #24
          Re: panasonic tx-p42gt30b

          keep in mind clearances, this board looks like it's designed to be low profile.

          Comment

          • tw2005
            Badcaps Legend
            • Oct 2011
            • 6458
            • Australia

            #25
            Re: panasonic tx-p42gt30b

            Originally posted by Jahson
            I may of confused you sorry, its not the fuse sided that's blown, its not reading the resistance 15ohms
            No I think I confused everything early on, I don't think there is a fuse as such but the whole resistor is the fuse. And it has done it's job because it is now open cct and no longer reading 15ohms.

            We'll just think of pins 1 & 3 as the same. (on the resistor)
            Last edited by tw2005; 05-17-2014, 07:12 AM.

            Comment

            • Jahson
              Badcaps Veteran
              • May 2012
              • 245
              • UK

              #26
              Re: panasonic tx-p42gt30b

              Ive removed them from the board, to test.

              hope this helps.
              Attached Files

              Comment

              • tw2005
                Badcaps Legend
                • Oct 2011
                • 6458
                • Australia

                #27
                Re: panasonic tx-p42gt30b

                Originally posted by Jahson
                Ive removed them from the board, to test.

                hope this helps.
                makes it clear,I understood your point, I've explained it best I can.

                Comment

                • Jahson
                  Badcaps Veteran
                  • May 2012
                  • 245
                  • UK

                  #28
                  Re: panasonic tx-p42gt30b

                  So I could order 5w 15ohms try what I said then, should be able to make it fit. can just swap them around.

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6458
                    • Australia

                    #29
                    Re: panasonic tx-p42gt30b

                    I'd pull the bad one out, get a 5W 15ohm ceramic, fit the leads where 2 & 3 are.

                    Comment

                    • Jahson
                      Badcaps Veteran
                      • May 2012
                      • 245
                      • UK

                      #30
                      Re: panasonic tx-p42gt30b

                      Isn't 1-3 the fuse & 1 - 2 the resistor ?

                      Comment

                      • Jahson
                        Badcaps Veteran
                        • May 2012
                        • 245
                        • UK

                        #31
                        Re: panasonic tx-p42gt30b

                        Replaced the 5w 15ohm resistor as said, also fuse, plugged in mains.
                        Heard bang fuse blown, checked the 5w 15ohm resistor open circuit again.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: panasonic tx-p42gt30b

                          You should consider building a series lightbulb tester to prevent popping fuses and new components. You probably have a shorted FET or bridge on the board somewhere, failing that, a bad controller IC stuck ON would cause this.
                          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

                          • Jahson
                            Badcaps Veteran
                            • May 2012
                            • 245
                            • UK

                            #33
                            Re: panasonic tx-p42gt30b

                            Cheers tom66, yea I give it ago in the morrows, think tw2005 was saying the same as a short somewhere. will double check those under the heatsinks.

                            Comment

                            • Jahson
                              Badcaps Veteran
                              • May 2012
                              • 245
                              • UK

                              #34
                              Re: PANASONIC TX-P42GT30B

                              Hiya after few more checks, does these readings sound right.

                              D100 <near to where that 5w 15 ohm resistor that was blown under the heatshield
                              - +
                              1-2=1.441
                              1-3=1.441
                              1-4=1.102
                              2-3=1.765
                              3-4=1.440

                              + -
                              1-2=0.494
                              1-3=0.492
                              1-4=0.473
                              2-3=1.763
                              3-4=0.493


                              D700 <near to the 2 transformers under the heatshield
                              - +
                              1-2=0.450
                              1-3=0.451
                              1-4=0.888
                              2-3=0.000
                              3-4=0.451

                              + -
                              1-2=OL
                              1-3=OL
                              1-4=OL
                              2-3=0.000
                              3-4=OL

                              Also notice C603 should be 820uf but its reading 726.3uf (ESR Meter Used)

                              These 2 diodes? D204 & D216 both reading OL, near the single transformer.

                              They read T3D 0D
                              Attached Files
                              Last edited by Jahson; 05-31-2014, 09:40 AM.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: panasonic tx-p42gt30b

                                How did you get pins 1 to 4 on one two pin diode?
                                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

                                • Jahson
                                  Badcaps Veteran
                                  • May 2012
                                  • 245
                                  • UK

                                  #36
                                  Re: panasonic tx-p42gt30b

                                  thats not related to those diodes

                                  Comment

                                  • Jahson
                                    Badcaps Veteran
                                    • May 2012
                                    • 245
                                    • UK

                                    #37
                                    Re: panasonic tx-p42gt30b

                                    post #31 I replace the fuse (f102) & piggy back a 5w 15 ohms resistor on too R100,
                                    did more probing.

                                    Main pictures in post #15
                                    Last edited by Jahson; 05-31-2014, 10:18 AM.

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: panasonic tx-p42gt30b

                                      Sorry, not paying attention here.
                                      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

                                      • Jahson
                                        Badcaps Veteran
                                        • May 2012
                                        • 245
                                        • UK

                                        #39
                                        Re: panasonic tx-p42gt30b

                                        Any suggestions

                                        Comment

                                        • Jahson
                                          Badcaps Veteran
                                          • May 2012
                                          • 245
                                          • UK

                                          #40
                                          Re: panasonic tx-p42gt30b

                                          Any other suggestions

                                          Comment

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