TX-P42S10 TNPA4829 6 blinks

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  • Hombre
    Badcaps Veteran
    • Jul 2013
    • 231
    • Croatia
    #1

    TX-P42S10 TNPA4829 6 blinks

    Hi guys

    Well i have a 42s10 that has a 6 blink problem.
    I got the set and from inside it looks horrible, full of dust, smoke from cigarettes, just a lot of thermal stress from what i can tell just looking it inside.
    So the problem is that nothing is shorted on SC and i have 6 blinks. Culprit is MID voltage that raises up to 50-55V and that's what triggers the error, i assume.
    Other voltages are up to spec, it's only this one that is making problems. I have a working TNPA4844 which i fixed few days that also had almost the same problem with MID voltage which was raising up to 155V. Fixed that with changing IC521 which was leaky on pin 7, and Q441 and Q452, also leaky.
    So i am comparing this working TNPA4844 with this TNPA4829 and can't find any difference in measurements.
    I may change the driver but readings are the same.
    Any thoughts what can cause problems with MID voltage?
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6457
      • Australia
      #2
      Re: TX-P42S10 TNPA4829 6 blinks

      Originally posted by Hombre
      Hi guys

      Well i have a 42s10 that has a 6 blink problem.
      I got the set and from inside it looks horrible, full of dust, smoke from cigarettes, just a lot of thermal stress from what i can tell just looking it inside.
      So the problem is that nothing is shorted on SC and i have 6 blinks. Culprit is MID voltage that raises up to 50-55V and that's what triggers the error, i assume.
      Other voltages are up to spec, it's only this one that is making problems. I have a working TNPA4844 which i fixed few days that also had almost the same problem with MID voltage which was raising up to 155V. Fixed that with changing IC521 which was leaky on pin 7, and Q441 and Q452, also leaky.
      So i am comparing this working TNPA4844 with this TNPA4829 and can't find any difference in measurements.
      I may change the driver but readings are the same.
      Any thoughts what can cause problems with MID voltage?
      Have all the diodes been checked?


      I had a similar saga with mid at 147V and 55V on a 4782 but I can't pinpoint what it was I did that fixed it but here's the link, maybe you'll spot something.

      https://www.badcaps.net/forum/showthread.php?t=45444

        Comment

        • Moreno83
          Badcaps Legend
          • Jun 2014
          • 2008
          • The Netherlands
          #3
          Re: TX-P42S10 TNPA4829 6 blinks

          the 42VT30 that i fixed also had 6 blinks. Was the driver ic on the SC board.
          I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

            Comment

            • Hombre
              Badcaps Veteran
              • Jul 2013
              • 231
              • Croatia
              #4
              Re: TX-P42S10 TNPA4829 6 blinks

              Well it seems that someone was playing before with this one. So i saw c563 soldered bad, also ic561 and ic562. Resoldered them and afterwards tried board with sc50 shorted. Green light was on! Connected buffers and plugged in tv, mal discharging, obvious SS fault, and after 3-4 seconds something popped, and it shutdown with 4 blinks
              SS shorted (TNPA4830), SC looks ok, but didn't test it thoroughly, it's a bit late here
              So tomorrow is SS board day probably

                Comment

                • Hombre
                  Badcaps Veteran
                  • Jul 2013
                  • 231
                  • Croatia
                  #5
                  Re: TX-P42S10 TNPA4829 6 blinks

                  Guys please give me some advice for this one.
                  Repaired SS board, Q001, Q002, Q022 went short, originaly 2PG006, replaced them with DG502LW. Also shorted Q101 2sk3995, replaced that one with RJK2017.
                  Now i'm back to 6 blinks
                  This MID voltage is driving me crazy, nothing shorted but it is always half of what it should be, right now around 50V, and it should be half Vsus which is 209.
                  No shorts, but something is not working properly.
                  Any advice what to check exactly in that part of circuit?

                  Thanks!

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6457
                      • Australia
                      #6
                      Re: TX-P42S10 TNPA4829 6 blinks

                      Originally posted by Hombre
                      Guys please give me some advice for this one.
                      Repaired SS board, Q001, Q002, Q022 went short, originaly 2PG006, replaced them with DG502LW. Also shorted Q101 2sk3995, replaced that one with RJK2017.
                      Now i'm back to 6 blinks
                      This MID voltage is driving me crazy, nothing shorted but it is always half of what it should be, right now around 50V, and it should be half Vsus which is 209.
                      No shorts, but something is not working properly.
                      Any advice what to check exactly in that part of circuit?

                      Thanks!
                      Just some random bits to check if ic521 was bad. q521,522,551, r521,522

                        Comment

                        • tvtimmy
                          Badcaps Legend
                          • Mar 2015
                          • 1160
                          • usa
                          #7
                          Re: TX-P42S10 TNPA4829 6 blinks

                          I have found out the hard way that going across the sc connector alone can give you a false positive. This means you check it the meter beeps for a few seconds then stops. You reverse the leads and it does it again. You think everything is ok, just a cap full of low meter voltage.sometimes it is spot on. Sometimes NO. Check everything for shorts, some dont show up on the sc connector test.

                            Comment

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