Horizontal black lines on screen - please for your help

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  • theo321
    Member
    • Jun 2023
    • 10
    • Greece
    #1

    Horizontal black lines on screen - please for your help

    Hello Everyone

    I need your help to repair my poor Samsung TV which decided not to let me watch my favorites series in the afternoon. Suddenly black horizontal lines appeared on the screen making my life a hell

    Photo:
    https://ibb.co/Kyhm9M5
    Close up photo:
    https://ibb.co/zNtv4XP

    I have seen many youtube videos with guys who put a tape in ribbon cable and TV fixed in a magic way (I have tried without success).

    My TV model is: LE46C750R2W
    Photo:
    https://ibb.co/Q6RFN94

    I have tried to disconnect one ribbon cable at a time to see what happens on the screen. unfortunately didn't happened what always happened on movies where everything is fixed in a real magic way and everyone is happy running laughing through green meadows. I saw half black and half white (but with lines) screen instead of half good pictured view.
    Photos:
    https://ibb.co/KbKTPrF
    https://ibb.co/cy0p2tg

    T-con board
    Photos:
    https://ibb.co/Sn3h32J
    https://ibb.co/WPmY3wY

    And I am wondering now. Am I a completely idiot looser who must be disappeared from earth face or there is a hope to help me one of this Team member ?
    Is T-com board for garbage or I need to put simple a tape in the correct pins on ribbon cable ?
    Last edited by theo321; 06-19-2023, 05:27 AM.
    Tags: None
    • theo321
      Member
      • Jun 2023
      • 10
      • Greece
      #2
      Re: Horizontal black lines on screen - please for your help

      Update:

      I have tried to disconnect once again the ribbon cables, one at a time to see what happens on the screen.
      When i disconnected the right ribbon cable I saw on the right half of the screen the content with horizontal lines. The left half was white.
      Photos:
      https://ibb.co/zSRS3bV

      When I disconnected the left ribbon cable I saw the right half of the screen just white and the left half black.
      Photos:
      https://ibb.co/4gp6PYs

        Comment

        • An-klamm
          Member
          • Feb 2023
          • 43
          • Deutschland
          #3
          Re: Horizontal black lines on screen - please for your help

          Your links dont work for me.

          Just can see ads.
          Use Forum functions to uploade your pictures.

            Comment

            • theo321
              Member
              • Jun 2023
              • 10
              • Greece
              #4
              Re: Horizontal black lines on screen - please for your help

              Hi An-klamm

              Thanks for your reply. I tried before logon and pictures appeared correctly. But anyway I will upload again as you suggested

                Comment

                • theo321
                  Member
                  • Jun 2023
                  • 10
                  • Greece
                  #5
                  Re: Horizontal black lines on screen - please for your help






                  Last edited by theo321; 06-19-2023, 01:52 PM. Reason: Upload photos

                    Comment

                    • lotas
                      Badcaps Legend
                      • Jan 2016
                      • 4457
                      • Russia
                      #6
                      Re: Horizontal black lines on screen - please for your help

                      Post a high quality photo of this area.
                      Attached Files

                        Comment

                        • theo321
                          Member
                          • Jun 2023
                          • 10
                          • Greece
                          #7
                          Re: Horizontal black lines on screen - please for your help

                          Hi Lotas

                          Thanks for your interest
                          Are these clear enough ?



                          Last edited by theo321; 06-19-2023, 11:35 PM.

                            Comment

                            • An-klamm
                              Member
                              • Feb 2023
                              • 43
                              • Deutschland
                              #8
                              Re: Horizontal black lines on screen - please for your help

                              I had the same issue on a Samsung UE55JU6850 a few weeks ago.
                              I had changed the TCON and no improvement.
                              I also tried the trick with the tape (picture got a little better but not good again). Then I accidentally noticed that a COF has become hot (measured with the thermal imaging camera about 50 ° C). I disposed of the panel and sold the individual parts.

                              Check whether one of the COFs might also get hot in your case. In my case, it was one at the bottom of the panel.

                                Comment

                                • theo321
                                  Member
                                  • Jun 2023
                                  • 10
                                  • Greece
                                  #9
                                  Re: Horizontal black lines on screen - please for your help

                                  Hi An-klamm,

                                  Thenks for your comments. I will try to take a high quality and clear picture on the aternoon because I was in hurry for my work before.

                                    Comment

                                    • lotas
                                      Badcaps Legend
                                      • Jan 2016
                                      • 4457
                                      • Russia
                                      #10
                                      Re: Horizontal black lines on screen - please for your help

                                      Try to mask these contacts on the non-working side.
                                      Attached Files

                                        Comment

                                        • theo321
                                          Member
                                          • Jun 2023
                                          • 10
                                          • Greece
                                          #11
                                          Re: Horizontal black lines on screen - please for your help

                                          Ok Lotas,
                                          I will try this when I will be at home and I will let you know.
                                          Thanks again

                                            Comment

                                            • theo321
                                              Member
                                              • Jun 2023
                                              • 10
                                              • Greece
                                              #12
                                              Re: Horizontal black lines on screen - please for your help

                                              Hi Lotas,

                                              I tried to mask these contacts you suggested me but with no results. Once I covered these contacts TV returned me black screen.
                                              I tried to cover some other pins 6 by 6 without success.
                                              Maybe I am wrong but I think that that the problem is caused by something else since once I unplug one by one the ribbon cable I dont take half clear picture. I take half picture with lines in one case and half picture black (& white) in the other.

                                                Comment

                                                • theo321
                                                  Member
                                                  • Jun 2023
                                                  • 10
                                                  • Greece
                                                  #13
                                                  Re: Horizontal black lines on screen - please for your help

                                                  Finally I found the problem. I checked the main board and many of transistors are fail.
                                                  I noticed something like evaporated liquid at the bottom of the doard. At first i cleaned up with isopropyl alcohol but nothing changed. After that I started to measure transistors and found that many of them gave power front and reverse.
                                                  Unfortunayely I cannot find one board in reasonable price. If you have an idea where I can find one (BN94-03388B) in good price you are welcome.

                                                  Anyway, thank you all for your support.

                                                  Here is a picture of it befor I cleaned it up

                                                  Last edited by theo321; 06-25-2023, 07:43 AM.

                                                    Comment

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