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Panasonic tx-50cx802b backlight and sound but no picture

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    Panasonic tx-50cx802b backlight and sound but no picture

    Hi
    Bit stumped with this tv
    Backlights come on and have sound but no picture
    I have even removed each tcon ribbon just to eliminate the screen but nothing
    Tcon fuse 12v both sides
    Psu
    Srv-16v =15.3v
    Srv-5v = 5.0v
    Srv-vcc= 27.6v

    Driver board
    Srv-led =40.7v
    Srv-16v=15v
    Srv-28v=27.4v

    Thanks
    Attached Files

    #2
    Re: Panasonic tx-50cx802b backlight and sound but no picture

    More pics of underside of the psu
    Attached Files
    Last edited by sordids999; 05-16-2020, 04:02 AM.

    Comment


      #3
      Re: Panasonic tx-50cx802b backlight and sound but no picture

      Testing the tcon would be where I would start.

      Upload a picture so we can see the test points.

      Comment


        #4
        Re: Panasonic tx-50cx802b backlight and sound but no picture

        Panasonics usually have blink codes. I would connect one side of the tv at a time (looks like 2 ribbons per side) to make sure you don't have a bad panel.

        Comment


          #5
          Re: Panasonic tx-50cx802b backlight and sound but no picture

          Picture uploaded of tcon board
          I have tried removing two ribbons at a time but still nothing shows up on the screen

          thanks
          Attached Files

          Comment


            #6
            Re: Panasonic tx-50cx802b backlight and sound but no picture

            Is the set giving an error blink code ?
            Willing to help but I'm no expert.

            Comment


              #7
              Re: Panasonic tx-50cx802b backlight and sound but no picture

              Check
              Vgl
              Vgh
              V33
              V12

              Comment


                #8
                Re: Panasonic tx-50cx802b backlight and sound but no picture

                Thanks hamie I'll check
                Dick barton no errors it flashes green and stays green as if the tv is working fine

                Comment


                  #9
                  Re: Panasonic tx-50cx802b backlight and sound but no picture

                  This is all I could find on the tcon

                  Vgl 0.35v
                  Vghp 0.00v
                  V12m 0.00v
                  V33dr 0.58v
                  Main tcon fuse 12v

                  Comment


                    #10
                    Re: Panasonic tx-50cx802b backlight and sound but no picture

                    Looks like the tcon may be faulty.
                    Test those voltages again but with the 4 connections to the panel removed.

                    Comment


                      #11
                      Re: Panasonic tx-50cx802b backlight and sound but no picture

                      I will do thanks
                      Theres a few tcons on Ebay quoted as refurbished and spoken to a seller who's told me the screens are poor on these TVs as well

                      Comment


                        #12
                        Re: Panasonic tx-50cx802b backlight and sound but no picture

                        Originally posted by sordids999 View Post
                        This is all I could find on the tcon

                        Vgl 0.35v
                        Vghp 0.00v
                        V12m 0.00v
                        V33dr 0.58v
                        Main tcon fuse 12v
                        So do you get the same Voltage readings without all 4 cables between T-CON and the LCD panel?
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment


                          #13
                          Re: Panasonic tx-50cx802b backlight and sound but no picture

                          Sorry I'm away at the moment I'll check in the morning

                          Comment


                            #14
                            Re: Panasonic tx-50cx802b backlight and sound but no picture

                            Sorry for the late reply but with all 4 ribbons disconnected it's the same readings

                            Thanks

                            Comment


                              #15
                              Re: Panasonic tx-50cx802b backlight and sound but no picture

                              At a guess say UP1 has failed.
                              I know these boards are pretty cheap but would be interesting to know what actually failed.

                              Off chance that the panel may have killed the board so I'd test the new tcon without the panel connected when you first install it.

                              Comment


                                #16
                                Re: Panasonic tx-50cx802b backlight and sound but no picture

                                Update
                                Tcon arrived today and the tv is now back up and working and testing

                                Thanks for your help

                                Comment


                                  #17
                                  Re: Panasonic tx-50cx802b backlight and sound but no picture

                                  Good job

                                  Comment

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