Lg lcd flickering screen after 15 mins help

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  • johnjgjohn
    Senior Member
    • Sep 2013
    • 87
    • scotland

    #1

    Lg lcd flickering screen after 15 mins help

    Hello all merry xmas
    Ive got an lg lcd when i power up everything works as normal for the first 15-20 mi s then the screen starts to flicker or pixelate ive checked for bulged caps and checked ribbon cables but not sure were to go from here ive got a video can it be uploaded here? Then u can see what its doing it gets worse the longer its on
    Thanks for any help
  • nomoresonys
    Badcaps Legend
    • Jan 2013
    • 12081
    • U.S.

    #2
    Re: Lg lcd flickering screen after 15 mins help

    can you post good clear pics. of each of the boards, and one of how they are all connected, what is the model number?, use caution when working with power supply HIGH VOLTAGE on primary side.

    Comment

    • Ltank
      Badcaps Veteran
      • Jun 2013
      • 776
      • USA

      #3
      Re: Lg lcd flickering screen after 15 mins help

      Check P.S. voltages on P.S. accoring to silkscreen legend near connectors. 24vdc to inverters should be stable. check backlight on command , PS-on, standby voltage then tell us what you have. Also check the larger capacitors on the inverter boards that power the backlight bulbs. Use a DVM with negative (black0 lead) on chasis gnd

      Comment

      • johnjgjohn
        Senior Member
        • Sep 2013
        • 87
        • scotland

        #4
        Re: Lg lcd flickering screen after 15 mins help

        The model no is 37lc55-za

        Comment

        • johnjgjohn
          Senior Member
          • Sep 2013
          • 87
          • scotland

          #5
          Re: Lg lcd flickering screen after 15 mins help

          Here is some pics
          Attached Files

          Comment

          • johnjgjohn
            Senior Member
            • Sep 2013
            • 87
            • scotland

            #6
            Re: Lg lcd flickering screen after 15 mins help

            Close up of psu
            Attached Files

            Comment

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA

              #7
              Re: Lg lcd flickering screen after 15 mins help

              take the power supply off the TV and check for cold solder joints on the transformer the main inverter transformer the one on the top right
              Did I leave the soldering iron on?

              Comment

              • johnjgjohn
                Senior Member
                • Sep 2013
                • 87
                • scotland

                #8
                Re: Lg lcd flickering screen after 15 mins help

                Surely if it was the inverter then i would loose backlight? I tried upload a vid but was taking like 20 mins from my fne then i cancelled it the backlight doesnt flicker or go out its just pixelated like when u have a bad signal on freeview the picture gets lines through it

                Comment

                • freakaftr8
                  Badcaps Legend
                  • Oct 2012
                  • 3743
                  • USA

                  #9
                  Re: Lg lcd flickering screen after 15 mins help

                  sorry missed that part yes it does sound like a main board problem. is it doing this on all inputs or just one?
                  Did I leave the soldering iron on?

                  Comment

                  • johnjgjohn
                    Senior Member
                    • Sep 2013
                    • 87
                    • scotland

                    #10
                    Re: Lg lcd flickering screen after 15 mins help

                    Originally posted by Ltank
                    Check P.S. voltages on P.S. accoring to silkscreen legend near connectors. 24vdc to inverters should be stable. check backlight on command , PS-on, standby voltage then tell us what you have. Also check the larger capacitors on the inverter boards that power the backlight bulbs. Use a DVM with negative (black0 lead) on chasis gnd

                    Ive checked all voltages they all seem to be what is stated and are all stable

                    Comment

                    • johnjgjohn
                      Senior Member
                      • Sep 2013
                      • 87
                      • scotland

                      #11
                      Re: Lg lcd flickering screen after 15 mins help

                      Doing it on all inputs when i first turn it on it works fine for about 20 mins then starts flickering a little but gets worse as time goes so must be heat related

                      Comment

                      • johnjgjohn
                        Senior Member
                        • Sep 2013
                        • 87
                        • scotland

                        #12
                        Re: Lg lcd flickering screen after 15 mins help

                        Here is a video of what its doing http://youtu.be/hkgiG7O7Jm0

                        Comment

                        • johnjgjohn
                          Senior Member
                          • Sep 2013
                          • 87
                          • scotland

                          #13
                          Re: Lg lcd flickering screen after 15 mins help

                          Does anyone know what would cause this have a look at the video above thanks

                          Comment

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