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LG UF6450 half screen is black, half is blue/white

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    LG UF6450 half screen is black, half is blue/white

    I have a LG UF6450 55" TV where the right of of the screen is block, the other is either blue or white. The red light when turned on flashes two times. Can anyone recommend what boards might need to be replace?

    #2
    Re: LG UF6450 half screen is black, half is blue/white

    Please provide good clear screenshots so we can see what we are dealing with.
    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


      #3
      Re: LG UF6450 half screen is black, half is blue/white

      Here you go
      Attached Files
      Last edited by jskuyper; 06-14-2020, 08:47 PM. Reason: Photo flipped

      Comment


        #4
        Re: LG UF6450 half screen is black, half is blue/white

        Might be a bad mainboard, I'm currenly working on a uf6400 that has almost the exact same symptoms. Can you get the TV to display any video on the 'black' half?

        Comment


          #5
          Re: LG UF6450 half screen is black, half is blue/white

          I can't get anything to display on the black side

          Comment


            #6
            Re: LG UF6450 half screen is black, half is blue/white

            What happen if you have ribbon cable between LCD panel and T-CON board connected only one at time?
            Can we see the pictures of the whole back side of the TV showing all the boards?
            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


              #7
              Re: LG UF6450 half screen is black, half is blue/white

              Originally posted by jskuyper View Post
              I can't get anything to display on the black side
              That coloured line i see is just a reflection ?

              Comment


                #8
                Re: LG UF6450 half screen is black, half is blue/white

                Here is a photo of the boards
                Attached Files

                Comment


                  #9
                  Re: LG UF6450 half screen is black, half is blue/white

                  The T-CON board is in the middle of the picture, you can see two flat ribbon cables to the panel, you need to to try having one of them connected one at a time to see what you see on the screen, you must be real careful when disconnect and reconnect the cables.
                  Note that the tab bonding boards are on the bottom edge of the LCD panel and they can be damaged if some one spray the glass cleaner directly on the panel and the liquid can seep on to the tab bonding boards and cause damages.
                  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


                    #10
                    Re: LG UF6450 half screen is black, half is blue/white

                    When unplugging one of the ribbons to tcon the black screen switches sides. When I unplug the left ribbon, the right side is black. Unplug right side left side goes black. Is it the main board then?

                    Comment


                      #11
                      Re: LG UF6450 half screen is black, half is blue/white

                      Would anyone know of a place where this main board would be in stock? Can't seem to find it anywhere?

                      Comment


                        #12
                        Re: LG UF6450 half screen is black, half is blue/white

                        What are the eleven letters on the top right of the barcode sticker on mainboard?

                        Comment


                          #13
                          Re: LG UF6450 half screen is black, half is blue/white

                          I would check Voltages on the T-CON board next.
                          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


                            #14
                            Re: LG UF6450 half screen is black, half is blue/white

                            Here is picture off main board. Are these the codes you were looking for?
                            Attached Files

                            Comment


                              #15
                              Re: LG UF6450 half screen is black, half is blue/white

                              Looks like there's a couple different mainboards, your part number is EBT64048902, your full model number is 55UF6450-UA AUSYLJR, DO NOT get EBT64049103 model number 65UF6450-UA BUSYLJR, I don't think it would be a direct match, like EBT64048902 would be.
                              Last edited by nomoresonys; 06-20-2020, 08:29 AM.

                              Comment


                                #16
                                Re: LG UF6450 half screen is black, half is blue/white

                                So you are not going to do any Voltages testing on the T-CON board?
                                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


                                  #17
                                  Re: LG UF6450 half screen is black, half is blue/white

                                  What would I put my meter to test and what would I be looking for ?

                                  Comment


                                    #18
                                    Re: LG UF6450 half screen is black, half is blue/white

                                    Originally posted by jskuyper View Post
                                    What would I put my meter to test and what would I be looking for ?
                                    Lets see good clear straight shot pictures of the whole T-CON board.
                                    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


                                      #19
                                      Re: LG UF6450 half screen is black, half is blue/white

                                      First I would test the fuse on the Tcon and see if you have the same voltage on either side of it. The fuse is often marked as "F1"
                                      Last edited by dick_barton; 06-24-2020, 09:31 AM.
                                      Willing to help but I'm no expert.

                                      Comment


                                        #20
                                        Re: LG UF6450 half screen is black, half is blue/white

                                        Picture of tcon
                                        Attached Files

                                        Comment

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