Panasonic sc tnpa5081 rebuild

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  • Tech 57
    Member
    • Aug 2014
    • 37
    • United States

    #381
    Re: Panasonic sc tnpa5081 rebuild

    they shipped it today when i get back i will post pictures
    thanks phil

    Comment

    • Stryff
      Member
      • Oct 2013
      • 16
      • United States

      #382
      Re: Panasonic sc tnpa5081 rebuild

      I ended up sending my board to PTS, they did an excellent job & I had even removed components before sending it to them... looked factory. Although my board didn't have a burned trace!

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #383
        Re: Panasonic sc tnpa5081 rebuild

        Been busy this week tidying up loose ends on a few boards I had busted but been too lazy to get into it.

        Did another 5081 which I'd started which is not ideal if you don't take notes of what's been done.

        So result of that was it failed, blowing 90% of the bits I'd just done.

        anyway I had forgotten about a couple of resistors that were a bit brown, R421,R422. They were open, so redid the board, replaced those 7.5 ohm gate resistors and this time all good.

        First one of these I've done with those bad.

        Also I subbed RJP56F4A for the DG502 and no dramas there.

        Comment

        • 11alon11@gmail.com
          Member
          • Sep 2014
          • 15
          • canada

          #384
          Re: Panasonic sc tnpa5081 rebuild

          I have tried to rebuild 2 boards TNPA5105 and TNPA5081for the TNPA5105 I used the shopjimmy kit and for the TNPA5081 i used the Zentronix kit. Both of the board's will power up and not blow anymore parts but I get the 6 blinks on both with the short on the 50 connector. I have checked and rechecked with no success no parts blow any more but I get the 6 blinks I am at a loss can someone try and help me

          Comment

          • 11alon11@gmail.com
            Member
            • Sep 2014
            • 15
            • canada

            #385
            Re: Panasonic sc tnpa5081 rebuild

            I have tried to rebuild 2 boards TNPA5105 and TNPA5081 for the TNPA5105 I used the shopjimmy kit and for the TNPA5081 i used the Zentronix kit. Both of the board's will power up and not blow anymore parts but I get the 6 blinks on both with the short on the 50 connector. I have checked and rechecked with no success no parts blow any more but I get the 6 blinks I am at a loss can someone try and help me

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia

              #386
              Re: Panasonic sc tnpa5081 rebuild

              Originally posted by 11alon11@gmail.com
              I have tried to rebuild 2 boards TNPA5105 and TNPA5081for the TNPA5105 I used the shopjimmy kit and for the TNPA5081 i used the Zentronix kit. Both of the board's will power up and not blow anymore parts but I get the 6 blinks on both with the short on the 50 connector. I have checked and rechecked with no success no parts blow any more but I get the 6 blinks I am at a loss can someone try and help me
              Did the kits come with instructions or a parts list and locations? Can you post up images of those lists or compile a list of every part removed and replaced?

              Did you use every part supplied?

              Comment

              • 11alon11@gmail.com
                Member
                • Sep 2014
                • 15
                • canada

                #387
                Re: Panasonic sc tnpa5081 rebuild

                this is the list of parts replaced on the tnpa5081 rebuild
                Attached Files

                Comment

                • 11alon11@gmail.com
                  Member
                  • Sep 2014
                  • 15
                  • canada

                  #388
                  Re: Panasonic sc tnpa5081 rebuild

                  this is what was replaced on the TNPA5105 on both after replacing the parts I get 6 blinks and no more blown parts with jumper 50 on
                  R 401 & 402
                  D451 & 490 & 491 & 618 & 652
                  D721
                  Q501 & 521 & 551
                  Q401 & 402
                  IC724
                  Q661
                  Q601 & 660
                  Ic501 & 521
                  Q451
                  Q421 & 422

                  Comment

                  • 11alon11@gmail.com
                    Member
                    • Sep 2014
                    • 15
                    • canada

                    #389
                    Re: Panasonic sc tnpa5081 rebuild

                    I also replaced IC771 on the TNPA5105 with no results and checking resistant on the 15v, 5v and sc2 no short, checking voltage on sc20 I do get 5v and 15v and on sc2 about 200v until the 6 blinks when voltage go down

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #390
                      Re: Panasonic sc tnpa5081 rebuild

                      That's certainly a big list for the 5081, I would say absolute worst case scenario. The only snags I remember is missing D451 shorted causing 6 blink, or a defective SOS6 detection cct which is unusual but possible and if the onboard LED ios open cct that too will create a 6 blink.

                      I wonder if you put a part in wrong since you've managed to get the same result on 2 boards?

                      Interesting to look at that list considering it says it fixes 42C2, 55ST30!, and 54" models which have more transistors

                      Comment

                      • tw2005
                        Badcaps Legend
                        • Oct 2011
                        • 6458
                        • Australia

                        #391
                        Re: Panasonic sc tnpa5081 rebuild

                        Originally posted by 11alon11@gmail.com
                        this is what was replaced on the TNPA5105 on both after replacing the parts I get 6 blinks and no more blown parts with jumper 50 on
                        R 401 & 402
                        D451 & 490 & 491 & 618 & 652
                        D721
                        Q501 & 521 & 551
                        Q401 & 402
                        IC724
                        Q661
                        Q601 & 660
                        Ic501 & 521
                        Q451
                        Q421 & 422
                        I've done a total of 1 of these. I really should keep a logbook, so hard to figure what I replaced.

                        looks like D451, R451, Q451, D482(R553?), Q551,R551, IC521

                        Q421, Q422, Q621, D642, Q401,Q402, Q660, Q661, Q701, (Q702?) IC773,

                        Comment

                        • Hombre
                          Badcaps Veteran
                          • Jul 2013
                          • 231
                          • Croatia

                          #392
                          Re: Panasonic sc tnpa5081 rebuild

                          Can you check MID voltage, across those blue capacitors, it should be half of VSUS, so somewhere around 100V, if it is lower than that it will trigger 6 blinks, if everything else looks ok.

                          Comment

                          • 11alon11@gmail.com
                            Member
                            • Sep 2014
                            • 15
                            • canada

                            #393
                            Re: Panasonic sc tnpa5081 rebuild

                            blue capacitors?

                            Comment

                            • 11alon11@gmail.com
                              Member
                              • Sep 2014
                              • 15
                              • canada

                              #394
                              Re: Panasonic sc tnpa5081 rebuild

                              Hi I did more work on the TNPA5081 with the 6 blink error and found that the resistant in IC771 center pin to the left is is about 900ohm and in a good board i tested its about 1400ohm any suggestions?
                              by the way MID voltage is going up to 100v and then down once it detects the 6 blinks

                              Comment

                              • peteburns
                                New Member
                                • Nov 2016
                                • 4
                                • Norway

                                #395
                                Re: Panasonic sc tnpa5081 rebuild

                                Hi all, please does anyone have a list of correct voltage values on this board and/or oscillograms at some important points? I fixed some Samsung plasmas but this Panasonic is too chaotical...My power board looks OK, with VSUS being +208V and Va being +60V roughly, +15V and +5V are OK too, but those output voltages from SC board are mystery - VAD, VFG, VSCN, VOL, MID...It would be nice to test all the IGBT and MOSFET control voltages and make sure they are OK before finally powering the board to VSUS :-) Thank you very much for any info ;-)

                                Comment

                                • peteburns
                                  New Member
                                  • Nov 2016
                                  • 4
                                  • Norway

                                  #396
                                  Re: Panasonic sc tnpa5081 rebuild

                                  So MID voltage should be 1/2 of the VSUS, roughly +105V, and VAD is roughly -170V, while VFG is virtual floating GND, pulsating between VAD and VSUS? What about the rest?

                                  Comment

                                  • Alastair E
                                    Chief Womble
                                    • Mar 2013
                                    • 1963
                                    • U.K.

                                    #397
                                    Re: Panasonic sc tnpa5081 rebuild

                                    check out app-note in my sig. It explains how Plasma sets work.

                                    All the SC is basically is a 6 legged H-Bridge and some floating-supplies and floating driver LV supplies...
                                    TELEFIX

                                    How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
                                    http://www.irf.com/technical-info/appnotes/an-1088.pdf
                                    PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                                    Comment

                                    • peteburns
                                      New Member
                                      • Nov 2016
                                      • 4
                                      • Norway

                                      #398
                                      Re: Panasonic sc tnpa5081 rebuild

                                      Thanks for that link, but it explains sustain board working principle in details. In this topic it is more important to describe scan board instead, and, even more importantly - from practical point of view, not theoretical...People don't actually need to know, how exactly the board works, but they need to know, how to examine components, find faulty ones and measure all the important spots in order to make sure all the power devices receive correct signals, so they don't experience big bang while switching on :-) Even the advice of using some resistor or light bulb at VSUS to protect the components is not correct, it will not protect enough and that's not the way any board should be tested...As mentioned many times before, any small overlooked component can cause some signal missing or distorted with the obvious result of immediate bang, or as in tw2005's case after 90min or so - both are not good enough and can be avoided :-)

                                      Comment

                                      • peteburns
                                        New Member
                                        • Nov 2016
                                        • 4
                                        • Norway

                                        #399
                                        Re: Panasonic sc tnpa5081 rebuild

                                        So, the 50" plasma TV works fine again, this time I was lucky, only the SC board was faulty. Just to mention those "100% repair kits" - don't rely on them at all, at least in my case they wouldn't contain all the failed components, meaning the whole board would fail again...

                                        Comment

                                        • 11alon11@gmail.com
                                          Member
                                          • Sep 2014
                                          • 15
                                          • canada

                                          #400
                                          Re: Panasonic sc tnpa5081 rebuild

                                          I decided to take a look at the tnpa5105 board again with the 6 blinks and found that Zener Diodes 871 and 872 blown. replaced them and now I don't have any blink code and I do have a picture the problem is that the picture is noisy and low in brightness both when I display the menu and picture from HDMI, do you have any idea as to what should be the problem now?

                                          Comment

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