LG 55UM6910PUC black screen

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  • Techboxcomputer
    Senior Member
    • Aug 2016
    • 61
    • USA
    #1

    LG 55UM6910PUC black screen

    Hi-
    Here is my story on the this tv. It was supposedly a lightning strike 55" they were just going to ditch because it was electrocuted. It was in such great shape I took it in for my own. I bought the repair kit for it from Shop Jimmy which included the power board, the mainboard and the wifi board. I am trying to determine if there is a additional problem or if Shop Jimmy sent me 1 bad board. So back to the story. When I got the TV, completely dead. Changed the power board no difference. Changed out the mainboard, all the LED's came up immediately and the TV started talking. "Press the OK button for..." So I flip it over and nothing on the screen, no LG splash just a little glow from the back lights. Press a button on the remote and the TV keeps talking so I have solid audio. So I am down to this. Is there another problem? Or bad main? I see there is a inverter or something similar buried in this under many screws but Shop Jimmy did not include that in their Kit, nor do the have it listed.

    Thank you for any help = )
    Tags: None
    • Storyteller12
      Badcaps Veteran
      • Jun 2020
      • 624
      • USA
      #2
      Re: LG 55UM6910PUC black screen

      Pictures help. Please post pics of the back of the tv with cover off and close ups of all t he boards. ( old and new)

        Comment

        • Davi.p
          Hobbist Tech
          • Sep 2009
          • 4318
          • Italy - Milan
          #3
          Re: LG 55UM6910PUC black screen

          check tcon board voltages, the one buried, since you don't know how to do it, check at least on input fuse and on the inductors.. report here..

            Comment

            • Techboxcomputer
              Senior Member
              • Aug 2016
              • 61
              • USA
              #4
              Re: LG 55UM6910PUC black screen

              Thank you for the response here are several pictures. Two of the original boards, and 2 of the installed boards. If you need more, just ask. Thanks!
              Attached Files

                Comment

                • Techboxcomputer
                  Senior Member
                  • Aug 2016
                  • 61
                  • USA
                  #5
                  Re: LG 55UM6910PUC black screen

                  Originally posted by Davi.p
                  check tcon board voltages, the one buried, since you don't know how to do it, check at least on input fuse and on the inductors.. report here..
                  I am a computer tech with 20 years experience...I do own a multimeter but would not even begin know how to perform that check. Not something we really ever have to do in my trade.

                    Comment

                    • Techboxcomputer
                      Senior Member
                      • Aug 2016
                      • 61
                      • USA
                      #6
                      Re: LG 55UM6910PUC black screen

                      Problem resolved. After posting the pictures storyteller asked for, I enlarged them and saw the ribbon cables were not properly seated. SMH. I apologize for wasting anyone's time

                        Comment

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