Panasonic TC-50PU54 8 blinks picture flashes then dead

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  • aasnowskate
    Senior Member
    • Jan 2013
    • 118
    • usa

    #21
    Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

    I am still thinking A board. Do you have any more thoughts?

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

      I'm thinking A board, but I'm only about 80% sure.
      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

      • aasnowskate
        Senior Member
        • Jan 2013
        • 118
        • usa

        #23
        Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

        thanks for all the help Tom. I ordered the A board for $18.99 on ebay. Hopefully that is what I need. I am at the limit of my knowledge, so it is worth the risk. I will notify this post when I get the board if it works or not.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

          $19 is damn cheap for an A board!
          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

          • tw2005
            Badcaps Legend
            • Oct 2011
            • 6458
            • Australia

            #25
            Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

            Hard to believe but probably this guy, has some real bargains at times. Must depend on the old supply and demand.

            Must have a few to clear and they'd be new sets transit damage too.

            http://www.ebay.com/itm/PANASONIC-TC...item27d633e3fb

            Comment

            • aasnowskate
              Senior Member
              • Jan 2013
              • 118
              • usa

              #26
              Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

              Got the A board in today and still the same problem. the screen lights up and then goes into shut down with 8 blinks. Does anyone have any thoughts as to what I could look for at this point?

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #27
                Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                I don't really know, can you try with your old SS board in case new one is bad? Very hard to tell without a scope to be sure.
                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

                • aasnowskate
                  Senior Member
                  • Jan 2013
                  • 118
                  • usa

                  #28
                  Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                  Yeah, I tried the new A board with the original SS board. Same thing. Going off the service manual you posted earlier, I have a bad panel. I trouble shot the SD/SU board by following what was in that manual and it seems fine. This all was a result of a power surge. I guess it could have knocked the panel out. I was just hoping for something easier. I will just part out the rest of the boards.

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6458
                    • Australia

                    #29
                    Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                    How long does the panel light up for? Is it a normal display or is it simply a quick flash and shutdown?

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                      I really doubt a power surge can kill a panel. Bad electrode structure, due to dirt or debris, or broken ffc maybe, but not a power surge.
                      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

                      • aasnowskate
                        Senior Member
                        • Jan 2013
                        • 118
                        • usa

                        #31
                        Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                        The pic flashes on for less than a second and then goes into 8 flash mode. I didn't think a surge could cause a panel to go bad either, but I'm out of answers. I am still open to suggestions though.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #32
                          Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                          You don't have a scope?
                          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

                          • aasnowskate
                            Senior Member
                            • Jan 2013
                            • 118
                            • usa

                            #33
                            Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                            No, I don't have a scope.

                            Comment

                            • aasnowskate
                              Senior Member
                              • Jan 2013
                              • 118
                              • usa

                              #34
                              Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                              According to the manual, the C3 board could also cause an 8 blink. It doesn't really say how to troubleshoot that board though.

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #35
                                Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                Check the +3.3V and Vda on it. Vda should be around 55V.
                                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

                                • tw2005
                                  Badcaps Legend
                                  • Oct 2011
                                  • 6458
                                  • Australia

                                  #36
                                  Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                  slide for what it's worth
                                  Attached Files

                                  Comment

                                  • aasnowskate
                                    Senior Member
                                    • Jan 2013
                                    • 118
                                    • usa

                                    #37
                                    Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                    I have 3.3 v on all three C boards when the Tv comes on and then they all go to 0v when it goes into shutdown and starts the 8 flashes. Where is the Vda?

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #38
                                      Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                      Do you see the little green SMD resistors? Vda can be tested on either end of those.
                                      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

                                      • aasnowskate
                                        Senior Member
                                        • Jan 2013
                                        • 118
                                        • usa

                                        #39
                                        Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                        Thanks, I have 58 VDC when the tv starts up and it drops to 39 VDC when it goes into shutdown. That is on the C3 board

                                        Comment

                                        • tom66
                                          EVs Rule
                                          • Apr 2011
                                          • 32560
                                          • UK

                                          #40
                                          Re: Panasonic TC-50PU54 8 blinks picture flashes then dead

                                          Seems like there is no short there.
                                          8 blink panel failure is only caused by:
                                          - Shorted 3.3V/Vda on C board
                                          - Open SS FFC

                                          Neither of which you have determined to be bad.

                                          I really doubt it is the panel but I don't know what else to suggest, it is very hard to check these things without having a scope.
                                          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

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