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Panasonic TC-50PS14 10 blinks

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    #1

    Panasonic TC-50PS14 10 blinks

    Well here it is, the scariest looking hack mod Ive yet to open. This set arrived at its former home after giving it original owner 10 blinks, The guy I got it from tried to implant all the boards from another model. None of the screws lined up sooo duct tape was the method of insulating and fastening the boards to the tv, a few wires were twisted around the grounding points. All in all it looked ready to go up in smoke at a moments notice.




    Fortunately he gave me all the original boards, after about an hour I got everything back into the chassis and am getting the 10 blink error, hopefully nothing else got screwed up in the interim. Heres a big pic of the power board, this one doesnt have the MC modules that caused the 10 blink on my other panasonic. So Master Tom is there another common fault on this board that causes trouble.





    Off to ElectroTanya to see if I can find a service manual.
    Liberating magic smoke one part at a time
    Tags: None
    #2
    Re: Panasonic TC-50PS14 10 blinks

    Found the manual Here if anyone else needs it. According to the manual the 10 blinks on this model is caused by the A board, However it appears from the schematic that the a board converts the 15v supplied by the power board to the rest of the required voltages. I put the scope on the 15v output on the power board and got nothing, but that was with all the harnesses plugged in, I will have to pull out the pins on the connector to isolate the a board fully as the same connector has the power supply on signal. I have to work the next 7 days straight but I will check in regularly.
    Edit, found another thread on this model where a shorted sc was causing 10 blinks. Went and unplugged the sc and I have 15v to the A board momentarily and fault changes to 7 blinks, vs header is reading 280 ohms.
    Last edited by Caleb; 10-12-2013, 11:17 PM.
    Liberating magic smoke one part at a time

    Comment

      #3
      Re: Panasonic TC-50PS14 10 blinks

      After an 80 hour week I finally had a few minutes to finish troubleshooting this tv. Both the su and sd are shorted out, the main short on the sc cleared when i removed the buffers, however the tv cant pass the startup test with the sc connected. I noticed a blowout mark on D618 and sure enough it tests shorted. I have a few of the same diode on another sc I swapped out a while back. I will swap it out tomorrow hopefully that is the only fault as these sc's are made of unobtanium.
      Liberating magic smoke one part at a time

      Comment

        #4
        Re: Panasonic TC-50PS14 10 blinks

        Unlikely just the diode, I'd expect shorted FETs too, IGBTs FET driver ICs etc. Check the P-FET Q604, I've seen one of these boards posted before with that diode blown and Q604 was reported short as well.

        I can't remember if anyone has successfully repaired these at component level yet which is a shame.

        You know about the SC50 jumper for SC testing minus the buffers? Although with that diode like that I'd expect nothing good.
        Attached Files
        Last edited by tw2005; 10-19-2013, 10:18 PM.

        Comment

          #5
          Re: Panasonic TC-50PS14 10 blinks

          Yes I used the jumper to test the buffers, did you have the link to that other thread? I was looking over the schematic last night and was noticing this diode was tied into the drain of two fets so I was kinda expecting at least one of them to be blown. Im going to try and fix this at the component level as I cant really justify sinking 200$ into this tv, if I can get it to pass the self test I will buy some buffers for it. At least I have a schematic for this one I will test out all the components around that vsus circuit.
          Liberating magic smoke one part at a time

          Comment

            #6
            Re: Panasonic TC-50PS14 10 blinks

            Hi Caleb. Not trying to hijack your thread here but I have basically the same set here with the 10 blink problem. TC-50SP1 Boards all look to be the same as yours. It will turn on for about 2 seconds and the fans run. Screen never glows or anything. Then it shuts down with the 10 blink code. Was wondering what you did to determine the shorts on the SC board. Mine has no apparent damage anywhere. Also, I believe Tom and some others on here have stated a way to test for a bad A board. Did you do this or do you know how to?

            This is my first try on a Panasonic Plasma. Hope you get yours running and thanks!

            Comment

              #7
              Re: Panasonic TC-50PS14 10 blinks

              To rule out A board isolate all connections from SC and SS including power and control, but leave the buffer/panel ribbons connected. Power TV up. You should get 6, 7 or 8 blinks if the SC or SS has a short. Reintroduce SS; if blink code is 6 or 7, then it's not SS.
              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

                #8
                Re: Panasonic TC-50PS14 10 blinks

                Ok. With both boards unhooked the code went to 6 blinks.

                Comment

                  #9
                  Re: Panasonic TC-50PS14 10 blinks

                  Re-introduced SS and it's still 6 blinks. So that's telling me it's the SC board?

                  Comment

                    #10
                    Re: Panasonic TC-50PS14 10 blinks

                    Yes.
                    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

                      #11
                      Re: Panasonic TC-50PS14 10 blinks

                      Wow. I only see a couple of these for sale and they are around $180. I only gave $25 for the set. May be time for some component troubleshooting. Any chance it's buffers? I saw earlier in this thread about jumpering the SC to test those. Wasn't sure how.

                      I'll look around for a board but not jumping on one that expensive for sure.

                      Thanks as always,

                      Aaron

                      Comment

                        #12
                        Re: Panasonic TC-50PS14 10 blinks

                        No problem Aaron, maybe between the two of us we can figure out the sc failure, I used this TRAINING GUIDE to isolate the sc although both my buffers are blown as well.

                        So far
                        D618 (8894) shorted and one pad blown off board
                        R613 (473) tests ok but also had a lifted pad
                        Q601 (RJK6026) tests .2 ohms across all leads
                        Q660 (RJK6026) tests .2 ohms across all leads
                        Q661 (RJP6065) tests 9.2 ohms G-C and G-E and .1 ohms C-E
                        L699 (471B) broke 1 lead while removing to access D618

                        Testing resistance across vsus to ground is now 700k, What is the likelyhood that those tiny driver transistors survived? Or do you guys think I got it all or should I continue to look for more before I order parts.
                        Liberating magic smoke one part at a time

                        Comment

                          #13
                          Re: Panasonic TC-50PS14 10 blinks

                          I saw a repair kit on EBay that I think included most if not all of those parts. I'm away from home right now but I'll start by checking those out later today. Even the kit is $80. This is obviously the most common board failure for this set. Every other board is readily available for much less.

                          Comment

                            #14
                            Re: Panasonic TC-50PS14 10 blinks

                            Your board is a 4782 right?

                            Comment

                              #15
                              Re: Panasonic TC-50PS14 10 blinks

                              Yes mine is the 4782, I will start looking at the repair kits and see if I missed something.

                              Checked the ebay listing its for one of each of the following
                              Q661
                              Q621
                              Q622
                              Q421
                              Q422
                              Q423
                              D421
                              D422
                              I tested all the rest and they appear to be ok, my question is now should I replace them for good measure as they could fail soon or just replace the failed parts.

                              Digikey doesnt have an exact replacement can I use any n channel mosfet as long as it has the same ratings?
                              Last edited by Caleb; 10-20-2013, 01:47 PM.
                              Liberating magic smoke one part at a time

                              Comment

                                #16
                                Re: Panasonic TC-50PS14 10 blinks

                                Better wait for someone with a more knowledge than me on that. I'll be checking those parts on my board shortly.

                                Comment

                                  #17
                                  Re: Panasonic TC-50PS14 10 blinks

                                  Well, it would appear that the kit might take care of mine. Everything on that list from Ebay is showing shorted except Q661. The parts in the list you changed are all showing fine on my board.

                                  I might try to source the parts elsewhere. That kit seems really high.

                                  Comment

                                    #18
                                    Re: Panasonic TC-50PS14 10 blinks

                                    Just curious what readings you are getting on q661
                                    Found datasheet attached below
                                    Attached Files
                                    Last edited by Caleb; 10-20-2013, 03:12 PM.
                                    Liberating magic smoke one part at a time

                                    Comment

                                      #19
                                      Re: Panasonic TC-50PS14 10 blinks

                                      Originally posted by Caleb View Post
                                      Yes mine is the 4782, I will start looking at the repair kits and see if I missed something.

                                      Checked the ebay listing its for one of each of the following
                                      Q661
                                      Q621
                                      Q622
                                      Q421
                                      Q422
                                      Q423
                                      D421
                                      D422
                                      I tested all the rest and they appear to be ok, my question is now should I replace them for good measure as they could fail soon or just replace the failed parts.

                                      Digikey doesnt have an exact replacement can I use any n channel mosfet as long as it has the same ratings?

                                      Ok. I'm trying to source these rather than buying the kit. I'll look through the schematic to verify but here's the numbers needed.

                                      3x 30G123
                                      2x MA3DF40
                                      2x RJP3034
                                      1x RJP6055

                                      Comment

                                        #20
                                        Re: Panasonic TC-50PS14 10 blinks

                                        Originally posted by Caleb View Post
                                        Just curious what readings you are getting on q661
                                        Found datasheet attached below
                                        E-G = 4.1 Ohms
                                        E-C = 0.7 Ohms
                                        C-G = 4.4 Ohms

                                        That's out of circuit now since I've pulled it.

                                        Comment

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