kdl-40nx723 e double image help please

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #1

    kdl-40nx723 e double image help please

    DOES ANYONE KNOW WHAT CAUSES THE
    double image problem on my 3d tv
    I will get a picture

    but basicly its like this

    all wording and images are doubled

    3d display
    3d display

    3d depth adjustment
    3d depth adjustment

    that's an example


    ive tried updating firmware etc any ideas could this be hardware related

    please help
    Last edited by wreksta; 09-11-2014, 07:36 AM.
  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #2
    Re: kdl-40nx723 e double image help please

    after removing left side screen ribbon my picture fades away
    when I remove my right side ribbon the left side of screen is perfect

    if I put both ribbons back im left with double image

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: kdl-40nx723 e double image help please

      That sounds like a bad LCD panel to me. If the image is OK with one ribbon out, it's usually the panel (I can't recall a case where it is not.)
      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

      • wreksta
        Badcaps Veteran
        • Aug 2013
        • 508
        • england

        #4
        Re: kdl-40nx723 e double image help please

        tom anything else it could be ideas please it just went like this

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: kdl-40nx723 e double image help please

          +1 bad 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

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: kdl-40nx723 e double image help please

            I think it's scrap, sorry :/. You're welcome to try fiddling with the tab bonds of course, but since it just "went" I doubt it'll be fixable.

            edit: Now I'm home and I see the picture, I would definitely say panel is bad.
            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

            • wreksta
              Badcaps Veteran
              • Aug 2013
              • 508
              • england

              #7
              Re: kdl-40nx723 e double image help please

              tom ,bud why do you say this straight away could the connections from tcon to driver board noit be bad I aint checked this yet could be a bad ribbon etc

              Comment

              • kasfamily
                Badcaps Veteran
                • Aug 2014
                • 765
                • Russia

                #8
                Re: kdl-40nx723 e double image help please

                a panel name in the tv ?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: kdl-40nx723 e double image help please

                  Originally posted by wreksta
                  tom ,bud why do you say this straight away could the connections from tcon to driver board noit be bad I aint checked this yet could be a bad ribbon etc
                  Because we've seen it hundreds of times and it is always a bad panel (so far I believe without a single exception.) You could rule out your ribbon problem by swapping the two ribbons over. (Do NOT connect left to right, but just swap the cables on both sides.) However, I doubt they are the fault.

                  When you unplugged one half, you removed whatever was faulty on one half of the panel that was loading a signal line down. (read: shorting an important signal.) I am not sure what exactly is failing, but it is probably one of the driver ICs on that part of the panel.

                  Modern LED-LCD TVs have shockingly high rates of panel failure. Next to open-circuit LED (a bloody difficult one to fix!), it seems to be the most common fault (...one of the reasons I prefer fixing plasmas.)

                  I bet this TV has Samsung (S-LCD) or AU Optronics panel.
                  Last edited by tom66; 09-11-2014, 01:56 PM.
                  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

                  • anmol
                    Senior Member
                    • Mar 2012
                    • 73
                    • India

                    #10
                    Re: kdl-40nx723 e double image help please

                    Originally posted by kasfamily
                    a panel name in the tv ?
                    Here is panel id list.

                    wreksta wrote,

                    after removing left side screen ribbon my picture fades away

                    may be VGH-VGL voltage problem there.

                    pls. post T-con pic.

                    Regards
                    Attached Files
                    Last edited by anmol; 09-12-2014, 04:00 AM.

                    Comment

                    • wreksta
                      Badcaps Veteran
                      • Aug 2013
                      • 508
                      • england

                      #11
                      Re: kdl-40nx723 e double image help please

                      so there could be hope



                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: kdl-40nx723 e double image help please

                        I don't know what anmol wants you to test but I'd suggest supplying the T-con picture for them.

                        I had a "noisy" picture issue caused by VGL fault (T-con), however it was completely different to yours, and mine was the same regardless of the ribbons (noisy picture either way.)
                        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

                        • wreksta
                          Badcaps Veteran
                          • Aug 2013
                          • 508
                          • england

                          #13
                          Re: kdl-40nx723 e double image help please

                          tom what is this vgl fault any ideas what to test please

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: kdl-40nx723 e double image help please

                            It's a voltage on the T-con board, marked by a test point VGL or VOFFE.

                            Should measure around -5V to -10V (black on chassis, red on test point)
                            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

                            • wreksta
                              Badcaps Veteran
                              • Aug 2013
                              • 508
                              • england

                              #15
                              Re: kdl-40nx723 e double image help please

                              thanks tom will test now

                              Comment

                              • wreksta
                                Badcaps Veteran
                                • Aug 2013
                                • 508
                                • england

                                #16
                                Re: kdl-40nx723 e double image help please

                                Tom vofee test point is 11.7 volts any ideas is there tab bonds down the sides mate

                                Comment

                                • wreksta
                                  Badcaps Veteran
                                  • Aug 2013
                                  • 508
                                  • england

                                  #17
                                  Re: kdl-40nx723 e double image help please

                                  Is that voltage correct

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: kdl-40nx723 e double image help please

                                    Is VOFFE negative? Does it change with the ribbons one at a time, or both in? If that is OK, then it rules out a VGL problem on the T-con board (so it probably is not a T-con problem but panel related.)

                                    On these newer panels there usually aren't bonds down the side of the screen, they are now built into the glass (which should be more reliable, time will tell.)
                                    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

                                    • anmol
                                      Senior Member
                                      • Mar 2012
                                      • 73
                                      • India

                                      #19
                                      Re: kdl-40nx723 e double image help please

                                      here is tcon pic. and voltage.

                                      pls. check if your tcon board is same as pic.

                                      SM4109

                                      VIN - 12V
                                      HAVDD - 8.25V
                                      VCC33 - 3.3V
                                      VOFFE - minus 7.4V
                                      AVDD - 16.5V
                                      VONE - 28.6V
                                      VCC12 - 1.2V
                                      VCOMG3 - 7V
                                      7V VCOMG2B
                                      INA- - OUTA 6.6V - 6.4V
                                      INB- - OUTB 7V - 6.6V
                                      RST - 3.3V
                                      OUTC - 8.6V

                                      Regards
                                      Attached Files

                                      Comment

                                      • wreksta
                                        Badcaps Veteran
                                        • Aug 2013
                                        • 508
                                        • england

                                        #20
                                        Re: kdl-40nx723 e double image help please

                                        hi I cant find half of those voltages
                                        tom can you explain how to do this negatively

                                        running tv as it all cables connected

                                        I get these
                                        havdd - 8.53v
                                        vcc33 - 3.3v
                                        voffe - 11.7v
                                        avdd 17.1v
                                        vone - 30v
                                        vcc11 1.2v
                                        ina 7.3v
                                        outa 7.3v
                                        inb 0.96v
                                        outb 1.0v

                                        from what I can work out here these don't look right to me

                                        help me out I cant seem to find
                                        rst
                                        outc
                                        7 vcomg2b
                                        vin
                                        vcomg3

                                        Comment

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