Panasonic TCP42S30 SN Board reflow-Help out a noob!

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  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia

    #21
    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

    What i don't understand is how R401 was correct before you started replacing parts but now only 1.8Ohms

    Comment

    • WHaThEFLuX
      Badcaps Veteran
      • Feb 2015
      • 277
      • USA

      #22
      Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

      Scratch that, user error, don't ask.......funny things start happening when you stare at a board all night.

      Anyways, I've replaced Q401, Q402, Q421, Q422, R401, R402, R421, R422, and D481. All the transistors are within spec, and all resistors are holding at 8.4, I hope that's still in range? D481 is still open, but I have a feeling it'll come to life once I get Q441 on the board.

      Hope I've done everything right so far, if anything seems out of sorts don't hesistate to let me know!
      "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

      -retiredcaps

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #23
        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

        Originally posted by WHaThEFLuX
        Scratch that, user error, don't ask.......funny things start happening when you stare at a board all night.

        Anyways, I've replaced Q401, Q402, Q421, Q422, R401, R402, R421, R422, and D481. All the transistors are within spec, and all resistors are holding at 8.4, I hope that's still in range? D481 is still open, but I have a feeling it'll come to life once I get Q441 on the board.

        Hope I've done everything right so far, if anything seems out of sorts don't hesistate to let me know!
        does not really make sense now at 8.4 either, unless it's your meter, lead or probe resistance 7.5 +- 5%. usually pretty close to the value.

        D481 still open, I don't understand that comment, a diode will test in one direction (conduct) and open imn the other so however you'r testing it, reverse the probes and use diode mode. might read 0.45 or so. usually they short so if no short it's probably fine.

        Comment

        • WHaThEFLuX
          Badcaps Veteran
          • Feb 2015
          • 277
          • USA

          #24
          Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

          My apologies, I've clearly been awake for too long.....the 8.4Ohm reading at the resistors is puzzling, is that an indication that something's amiss? I rechecked the diode and it is showing 2.5 with the meter set to 200, is that incorrect as well? I'm using a Harbor Freight DMM, that's probably my first mistake, but it was accurate before I started removing components, where have I gone wrong?
          "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

          -retiredcaps

          Comment

          • WHaThEFLuX
            Badcaps Veteran
            • Feb 2015
            • 277
            • USA

            #25
            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

            So after testing a bunch of componenents on all boards and getting higher than normal readings, I assume my DMM is the culprit....I'll be picking up a decent one either today or tomorrow, I'll report back with my results.
            "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

            -retiredcaps

            Comment

            • WHaThEFLuX
              Badcaps Veteran
              • Feb 2015
              • 277
              • USA

              #26
              Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

              Still waiting on DG302 to arrive.....bought a decent meter and everything is looking good.....removed Q441 and now D481 is reading normally as I suspected.

              On another note, I'm curious as to why I had to hold my hot air gun on that transistor for about 20 mins before it would release....the others came off much quicker, I had it set to ~340 C, any ideas?
              "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

              -retiredcaps

              Comment

              • tw2005
                Badcaps Legend
                • Oct 2011
                • 6458
                • Australia

                #27
                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                Originally posted by WHaThEFLuX
                Still waiting on DG302 to arrive.....bought a decent meter and everything is looking good.....removed Q441 and now D481 is reading normally as I suspected.

                On another note, I'm curious as to why I had to hold my hot air gun on that transistor for about 20 mins before it would release....the others came off much quicker, I had it set to ~340 C, any ideas?
                the whole board acts like a heatsink on these so maybe that was slowing it down.

                Comment

                • WHaThEFLuX
                  Badcaps Veteran
                  • Feb 2015
                  • 277
                  • USA

                  #28
                  Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                  Hmm interesting, well the transistor finally showed up.....once it's in, is there any way to test the board or should I just throw it in and hope for the best?
                  "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                  -retiredcaps

                  Comment

                  • WHaThEFLuX
                    Badcaps Veteran
                    • Feb 2015
                    • 277
                    • USA

                    #29
                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                    OK, so I got the board all hooked up and turned the tv on.....got a solid red LED, no picture, no sound, and no blinks.....the green LEDs on the SS and SN boards are on....Looking at the troubleshooting guide it says that if I turn the power off and the red LED stays on, it's in locked mode however, the LED turns off immediately. According to the guide this indicates a different problem but it doesn't say what.

                    Maybe I don't have the panel ribbon cables connected properly? I feel like I'm close to getting this set working, all
                    voltages and resistance readings are accurate across all boards, what am I missing?
                    Last edited by WHaThEFLuX; 03-02-2015, 07:37 PM.
                    "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                    -retiredcaps

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #30
                      Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                      Originally posted by WHaThEFLuX
                      OK, so I got the board all hooked up and turned the tv on.....got a solid red LED, no picture, no sound, and no blinks.....the green LEDs on the SS and SN boards are on....Looking at the troubleshooting guide it says that if I turn the power off and the red LED stays on, it's in locked mode however, the LED turns off immediately. According to the guide this indicates a different problem but it doesn't say what.

                      Maybe I don't have the panel ribbon cables connected properly? I feel like I'm close to getting this set working, all
                      voltages and resistance readings are accurate across all boards, what am I missing?
                      no idea, post a photo. just make sure the TV is off before you start adjusting ribbons etc

                      Comment

                      • WHaThEFLuX
                        Badcaps Veteran
                        • Feb 2015
                        • 277
                        • USA

                        #31
                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                        Idk, the odds of me seating all 8 incorrectly are pretty slim, but you never know! In your absence, I've researched just about every thread on badcaps that has to do with this model, done every test you've recommended to other members, yet I still get a steady power LED........I'd be forever in your debt if you could walk me through some troubleshooting, I must be missing something.

                        I guess my first question would be:

                        Does a green LED on the SN board indicate that it's functioning properly?
                        Last edited by WHaThEFLuX; 03-03-2015, 01:30 AM.
                        "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                        -retiredcaps

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #32
                          Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                          Originally posted by WHaThEFLuX
                          Idk, the odds of me seating all 8 incorrectly are pretty slim, but you never know! In your absence, I've researched just about every thread on badcaps that has to do with this model, done every test you've recommended to other members, yet I still get a steady power LED........I'd be forever in your debt if you could walk me through some troubleshooting, I must be missing something.

                          I guess my first question would be:

                          Does a green LED on the SN board indicate that it's functioning properly?
                          yes, at least voltage wise it's good, do you own a camera?

                          Comment

                          • WHaThEFLuX
                            Badcaps Veteran
                            • Feb 2015
                            • 277
                            • USA

                            #33
                            Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                            sure, I'd be happy to take pics of anything you'd like to see.
                            "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                            -retiredcaps

                            Comment

                            • tw2005
                              Badcaps Legend
                              • Oct 2011
                              • 6458
                              • Australia

                              #34
                              Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                              Originally posted by WHaThEFLuX
                              sure, I'd be happy to take pics of anything you'd like to see.
                              the back of the tv, with it on and also clear enough to show me all the boards an cables etc.

                              I don't know what I'm looking for now except need to start somewhere. I guess there's a chance of a double fault. Does the remote operate the TV on/off? have you tried getting into service mode

                              Comment

                              • WHaThEFLuX
                                Badcaps Veteran
                                • Feb 2015
                                • 277
                                • USA

                                #35
                                Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                Unfortunately I'm without a remote, this was a "found in the garbage" project, so service mode isn't an option......I'll take that pic and upload it ASAP.
                                "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                -retiredcaps

                                Comment

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6458
                                  • Australia

                                  #36
                                  Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                  Originally posted by WHaThEFLuX
                                  Unfortunately I'm without a remote, this was a "found in the garbage" project, so service mode isn't an option......I'll take that pic and upload it ASAP.
                                  so you have no other panasonic tvs to use a remote from?

                                  Comment

                                  • tw2005
                                    Badcaps Legend
                                    • Oct 2011
                                    • 6458
                                    • Australia

                                    #37
                                    Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                    is there any glow to the screen at all or can you detect a change from when it's off to on?

                                    Comment

                                    • WHaThEFLuX
                                      Badcaps Veteran
                                      • Feb 2015
                                      • 277
                                      • USA

                                      #38
                                      Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                      no glow whatsoever, no change and unfortunately no, only a samsung and a phillips.
                                      "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                      -retiredcaps

                                      Comment

                                      • tw2005
                                        Badcaps Legend
                                        • Oct 2011
                                        • 6458
                                        • Australia

                                        #39
                                        Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!

                                        I guess you've tried looking at it in the dark at turn on? If the sustains are on I'd expect some indication from the panel it's on, generally it'd be a dark gray but in a dark room should see a change

                                        Comment

                                        • WHaThEFLuX
                                          Badcaps Veteran
                                          • Feb 2015
                                          • 277
                                          • USA

                                          #40
                                          Re: Panasonic TCP42S30 SN Board reflow-Help out a noob!









                                          "You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."

                                          -retiredcaps

                                          Comment

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