Lg 37LF65-ZC

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  • snipersquad100
    Badcaps Veteran
    • Nov 2013
    • 297
    • uk

    #1

    Lg 37LF65-ZC

    I got a Lg 37LF65-ZC which is working on some sources ie hdmi but not scart or ariel. It also faild to turn off with the remote. I believe it to be the main board at fault, if so does anyone know where I can get one, thanks.
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Lg 37LF65-ZC

    Check 3.4V from PSU, can occasionally cause odd fault like this.
    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

    • snipersquad100
      Badcaps Veteran
      • Nov 2013
      • 297
      • uk

      #3
      Re: Lg 37LF65-ZC

      thanks tom

      Comment

      • snipersquad100
        Badcaps Veteran
        • Nov 2013
        • 297
        • uk

        #4
        Re: Lg 37LF65-ZC

        The 3.4v rail is ok, it still there when the picture goes off.
        Back lights are on thou.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Lg 37LF65-ZC

          So the backlights stay on but no pictures, then check and see if the T-CON is still getting the voltage to the SMD fuse on the T-CON board, or the main board is not sending the voltage or the signals to the T-CON.
          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

          • snipersquad100
            Badcaps Veteran
            • Nov 2013
            • 297
            • uk

            #6
            Re: Lg 37LF65-ZC

            I've changed the main board but now when it goes off it like flickers as if its trying to come back on.
            Think I have a look at the t-con board.

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Lg 37LF65-ZC

              Backlight usually not related to T-con.
              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

              • snipersquad100
                Badcaps Veteran
                • Nov 2013
                • 297
                • uk

                #8
                Re: Lg 37LF65-ZC

                back light stays on,its the signal that goes.

                Comment

                • snipersquad100
                  Badcaps Veteran
                  • Nov 2013
                  • 297
                  • uk

                  #9
                  Re: Lg 37LF65-ZC

                  This is what im getting after about 2 min.
                  Got sound, flicky pic
                  Attached Files

                  Comment

                  • snipersquad100
                    Badcaps Veteran
                    • Nov 2013
                    • 297
                    • uk

                    #10
                    Re: Lg 37LF65-ZC

                    Changed the t-con board but sill the same as the screen in the last pic after 2min.
                    so its got a new main and t-con boards.
                    Any ideas what else it could be, im starting to think its the screen.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Lg 37LF65-ZC

                      For what it's worth I've never seen a bad panel do that.
                      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

                      • snipersquad100
                        Badcaps Veteran
                        • Nov 2013
                        • 297
                        • uk

                        #12
                        Re: Lg 37LF65-ZC

                        What if it had a dodgy ribbon flex cable that glued to the screen. ive seen on youtube that when they get warm they can come loose. and can only be temporarily fixed with a bit of padding pushing against the ribbon.

                        Comment

                        • snipersquad100
                          Badcaps Veteran
                          • Nov 2013
                          • 297
                          • uk

                          #13
                          Re: Lg 37LF65-ZC

                          Tom, do you have a schematic on the power supply?
                          I checked most of the caps but the main caps are gunked down and I cant read the uf number. My esr meter is saying the caps are good if less than 330uF,so I need to find out the cap rating.

                          Comment

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