Panasonic TC-P42X3 will not start

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  • Fwrothy
    Senior Member
    • Feb 2014
    • 178
    • Canada

    #1

    Panasonic TC-P42X3 will not start

    I have no history on the set; when I plug it in I get a triple relay click and if left for ~8s another click.
    Initiating the power button gives the triple relay click followed immediately by the single click and the red standby led on steady the screen does not light.
    Did read over the service manual and did not find a place to start troubleshooting .
    If I hold the the power button a few seconds and release, I get 14 blinks from the standby led ?

    Any ideas where to look?
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  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #2
    Re: Panasonic TC-P42X3 will not start

    got a mulimeter? at the SN2 connector (TV off) first check in DC (215V) to be sure no voltage is there if it's been on recently, then measure resistance across the SN2 and see if dead short

    Comment

    • Fwrothy
      Senior Member
      • Feb 2014
      • 178
      • Canada

      #3
      Re: Panasonic TC-P42X3 will not start

      No voltage SN2 and yes it is shorted.

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: Panasonic TC-P42X3 will not start

        Originally posted by Fwrothy
        No voltage SN2 and yes it is shorted.
        that would be the fault then, I should have said disconnect the cable , if you did that and sn2 is short then Sn needs replacement / repair. I would also check ss11 and ss3 for short also with those cables disconnected as vsus goes to both sn and ss but I'm expecting just the Sn board has failed

        Comment

        • Fwrothy
          Senior Member
          • Feb 2014
          • 178
          • Canada

          #5
          Re: Panasonic TC-P42X3 will not start

          No sorry the short was on the p board side...

          Comment

          • tw2005
            Badcaps Legend
            • Oct 2011
            • 6458
            • Australia

            #6
            Re: Panasonic TC-P42X3 will not start

            Originally posted by Fwrothy
            No sorry the short was on the p board side...
            can you expand on that. what was connected/disconnected and where measured.

            basically a dead short on vsus will cause a locked solid LED which it sounds you have. You have shorted vsus so we need to isolate to find whether it's sn,ss or both

            Comment

            • Fwrothy
              Senior Member
              • Feb 2014
              • 178
              • Canada

              #7
              Re: Panasonic TC-P42X3 will not start

              Sorry Tw2005 don't mean to be confusing...
              I did disconnect sn2, there is no short at the sn board terminals.
              When I checked the terminals at the p board I got continuity...

              Comment

              • tw2005
                Badcaps Legend
                • Oct 2011
                • 6458
                • Australia

                #8
                Re: Panasonic TC-P42X3 will not start

                ok, not what I was expecting so across p2 is shorted so if p11 is disconnected is there still a short measuring across p2?

                Comment

                • Fwrothy
                  Senior Member
                  • Feb 2014
                  • 178
                  • Canada

                  #9
                  Re: Panasonic TC-P42X3 will not start

                  With p11 disconnected no short at p2 anymore.

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6458
                    • Australia

                    #10
                    Re: Panasonic TC-P42X3 will not start

                    must be ss board, the only thing I'm unsure is whether any aprt of the SN is damaged. Is sn3 shorted at all if isolated, either pins 3 or 5 to gnd?

                    Comment

                    • Fwrothy
                      Senior Member
                      • Feb 2014
                      • 178
                      • Canada

                      #11
                      Re: Panasonic TC-P42X3 will not start

                      No 3&5 are not shorted to ground.
                      Last edited by Fwrothy; 02-25-2015, 03:21 AM. Reason: Oops

                      Comment

                      • tw2005
                        Badcaps Legend
                        • Oct 2011
                        • 6458
                        • Australia

                        #12
                        Re: Panasonic TC-P42X3 will not start

                        Originally posted by Fwrothy
                        Not sure of the pin #s,will have to check schem, short at top and middle pin of sn3.
                        look closely at the board, you will see numbers 1 & 5, 3&5 are the 2 pins you refer to so yes they are short to each other as they are the same connection, so are they shorted to gnd or to pin 1? I think pin 1 is gnd

                        Comment

                        • Fwrothy
                          Senior Member
                          • Feb 2014
                          • 178
                          • Canada

                          #13
                          Re: Panasonic TC-P42X3 will not start

                          Again tw2005 appologies, as soon as I looked at the schem I saw what was what, I've got a good light on the situation now as well ...Ive figured out that you are the resident expert on these Vera plasmas so I am trying to be brief and make the most of our time I edited the last post too late. That said, no shorts at 3&5

                          Comment

                          • tw2005
                            Badcaps Legend
                            • Oct 2011
                            • 6458
                            • Australia

                            #14
                            Re: Panasonic TC-P42X3 will not start

                            I really hate the word expert

                            I have some experience and a personal liking for the panasonic plasmas, always learning, still make mistakes.

                            certainly seems like SS board, cheap to buy, probably easy to fix but $20-30 for a board or $35 at shopjimmy

                            TXNSS1PPUU (TNPA5313AC)

                            keep the old board or flog it off for someone to play with. with these HD sets and the ss connected to the sn one can kill the other but I'd leave it as is and get a SS . If you are inclined to experimenting and powering it up I would make sure ss3 and ss11 are disconnected. if ss11 is removed and it will powerup there's a chance something wrong at ss3 could blow the Sn board. I've made that mistake.

                            If ss does not fix, depending on the error blink may also need SN but no shorts at the connectors at the sn is a good start. You could find tp82 (at the sc, usually near sn20)and just check that to gnd for the 15v line to be sure that is not short
                            Last edited by tw2005; 02-25-2015, 03:42 AM.

                            Comment

                            • Fwrothy
                              Senior Member
                              • Feb 2014
                              • 178
                              • Canada

                              #15
                              Re: Panasonic TC-P42X3 will not start

                              Humility is an admirable trait, that kind of perspective is what,in my opinion,makes this forum. I'm in this for the fun and learning too!
                              Have you tried to repair an ss board; I know it hardly seems worth it for that kind of money but I'm willing to give it a go...

                              Comment

                              • tw2005
                                Badcaps Legend
                                • Oct 2011
                                • 6458
                                • Australia

                                #16
                                Re: Panasonic TC-P42X3 will not start

                                actually , back tracking a little, what resistance do you have at sn2 and sn3, set meter to highest resistance, sn2 could be high K ohms or even a few meg, sn3 I forget but over 50K ohms i think

                                Comment

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6458
                                  • Australia

                                  #17
                                  Re: Panasonic TC-P42X3 will not start

                                  Originally posted by Fwrothy
                                  Humility is an admirable trait, that kind of perspective is what,in my opinion,makes this forum. I'm in this for the fun and learning too!
                                  Have you tried to repair an ss board; I know it hardly seems worth it for that kind of money but I'm willing to give it a go...
                                  well, yes on an x20, i was hoping not to go down that path due to not having seen this board. I'd start with the rjp30h2 igbts, probably shorted, then you have to remove them if so, then check the SMD dpak diodes to see if shorted , from there guessing but driver ic maybe need replacing as precaution.

                                  not a lot of history on this model yet in the forum. were any screws loose that mount the sn or ss?

                                  you may save a few dollars but not a lot if the repair fails.

                                  your call really. if the board was expensive or unavailable then you'd have to.

                                  not seeing any repair kits either so ss fail is probably a little rare.

                                  on the x20 it's probably the most common failure with a % of both sn , ss fail together.

                                  Comment

                                  • Fwrothy
                                    Senior Member
                                    • Feb 2014
                                    • 178
                                    • Canada

                                    #18
                                    Re: Panasonic TC-P42X3 will not start

                                    Ah I was wonder about that, at sn3 35.7k and at sn2 it is steadily increasing- started at~900k and kept going up-I stopped at around 4M

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #19
                                      Re: Panasonic TC-P42X3 will not start

                                      on a sn I have for 2010 model 70 -100k depending on the way the probes are at sn3, but honestly I don't know if 35.7 k is normal or not. the other sounds typical.

                                      can't give an assurance but I'd just do the SS. getting a sn too would blow the cost out for possibly no reason

                                      Comment

                                      • Fwrothy
                                        Senior Member
                                        • Feb 2014
                                        • 178
                                        • Canada

                                        #20
                                        Re: Panasonic TC-P42X3 will not start

                                        Ya I read all the other thread for this model,that how I found the manual so quick. The only boards I've tried to repair sof far are PSUs, with varying success so this could be fun( if it was the A board then I'd pass).
                                        Anyway no loose screws on the SN, I no I read about this problem, gotta remove the A to get at SS. Wil post pics at that point.

                                        Comment

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