LG 65uf7690-uh picture problems

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  • nwelec
    Senior Member
    • Dec 2014
    • 61
    • usa
    #1

    LG 65uf7690-uh picture problems

    When both sides of the Tcon are connected the TV picture looks like picture one and according to the person who owns the tv originally the problem was on top. If I disconnect the left cable to the Tcon then it looks like picture two and if I disconnect right side it looks like picture three. Now with either side disconnected the picture that is showing will start to fade. I am pretty sure bad panel but I have not ruled out the Tcon and am asking for advice. There are no side tabs so tab removal is out of the question.
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: LG 65uf7690-uh picture problems

      Panel problem, since the tab bonding boards are on the bottom edge of the panel, you should inspect them, also inspect the side tabs (Gate drive) if it has any.
      Last edited by budm; 04-23-2019, 07:08 PM.
      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

        • nomoresonys
          Badcaps Legend
          • Jan 2013
          • 12208
          • U.S.
          #3
          Re: LG 65uf7690-uh picture problems

          Looking like panel issue, the cutoff tape method might get you a good image.

            Comment

            • nwelec
              Senior Member
              • Dec 2014
              • 61
              • usa
              #4
              Re: LG 65uf7690-uh picture problems

              Thanks for the quick replies, sorry I did not answer earlier I never got a notification that it was answered.

                Comment

                • Wilderone
                  Senior Member
                  • May 2018
                  • 76
                  • Australia
                  #5
                  Re: LG 65uf7690-uh picture problems

                  This is the Mainboard, I did one recently.
                  Common fault for the UF series.
                  Notice the menus are still okay.
                  There are revised boards available from LG suppliers.

                    Comment

                    • nwelec
                      Senior Member
                      • Dec 2014
                      • 61
                      • usa
                      #6
                      Re: LG 65uf7690-uh picture problems

                      The difference is my menu is not ok so that usually is the panel.

                        Comment

                        • budwich
                          Badcaps Legend
                          • Jul 2015
                          • 3097
                          • Canada
                          #7
                          Re: LG 65uf7690-uh picture problems

                          as suggested, try the "tape cutoff" method (placing a bit of tape on the tcon cable to block certain pins) and see if you can get a proper picture.

                            Comment

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk
                              #8
                              Re: LG 65uf7690-uh picture problems

                              This video maybe worth watching https://www.youtube.com/watch?v=j7vl7-vZEL8

                                Comment

                                • nwelec
                                  Senior Member
                                  • Dec 2014
                                  • 61
                                  • usa
                                  #9
                                  Re: LG 65uf7690-uh picture problems

                                  Thanks for the response but still does not fix the tv issue. No mater where I put the tape the video still has lines in it.

                                    Comment

                                    • nomoresonys
                                      Badcaps Legend
                                      • Jan 2013
                                      • 12208
                                      • U.S.
                                      #10
                                      Re: LG 65uf7690-uh picture problems

                                      Cut tape works on a lot of m, try turning down your backlights not brightness if possible, see if the double image clears up any.

                                        Comment

                                        • nwelec
                                          Senior Member
                                          • Dec 2014
                                          • 61
                                          • usa
                                          #11
                                          Re: LG 65uf7690-uh picture problems

                                          After playing with the panel I found that the right side connector if pushed on clears up the picture so I am going to play with it to see if maybe it is just some bad solder.

                                            Comment

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