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    HITACHI 55HK6T64U horizontal lines

    Good evening
    Recently acquired this TV 2 small faint lines going horizontally across the screen and middle of the screen has a ghosting,jumping image
    Tested voltages 17ips20
    Low voltages for example 12v=11.4v
    Tcon board fuse is 11.4v I also disconnected one ribbon at a time but nothing shows on the screen so straight away thought it could have been possible tcon fault luckily had a spare but still the same

    Thanks
    Attached Files

    #2
    Re: HITACHI 55HK6T64U horizontal lines

    Lest see the screen shots showing what it looks looks like on the screen, it sound likes Gate drive issue.
    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: HITACHI 55HK6T64U horizontal lines

      Video uploaded

      https://youtu.be/INxS6q6T8Wo
      Attached Files

      Comment


        #4
        Re: HITACHI 55HK6T64U horizontal lines

        "Tape cutoff" method might work: https://www.youtube.com/watch?v=j7vl7-vZEL8

        Comment


          #5
          Re: HITACHI 55HK6T64U horizontal lines

          Do you still get 11.4 with the panel unhooked from the tcon, both ribbons?

          Comment


            #6
            Re: HITACHI 55HK6T64U horizontal lines

            Sorry been busy I'll check this week and update

            Comment


              #7
              Re: HITACHI 55HK6T64U horizontal lines

              11.4v even with both ribbon cables disconnected I decided to strip the screen apart to see if theres anything visibly wrong and noticed the majority of the backlights are giving of a blue light instead of a white glow so I'm gathering the backlights are faulty and this is what's pulling down the low voltages
              P.s I have tried the tcon ribbon tape trick with no luck what so ever

              Thanks
              Last edited by sordids999; 07-18-2020, 04:18 PM.

              Comment


                #8
                Re: HITACHI 55HK6T64U horizontal lines

                Yep need to replace all the backlights, then turn the backlight setting down as low as you can tolerate the display, some do a current mod with resistor/s, you likely saw all the posts here about blue backlights.
                Last edited by nomoresonys; 07-19-2020, 08:37 AM.

                Comment


                  #9
                  Re: HITACHI 55HK6T64U horizontal lines

                  Hi, sorry for posting on an old thread but I have the same TV and sounds like same issue. I'd like to get this fixed rather than bin it. Did you ever resolve it please?

                  Comment


                    #10
                    Re: HITACHI 55HK6T64U horizontal lines

                    panel fault, open a new.thread please, masking technique the only possibility

                    Comment


                      #11
                      Re: HITACHI 55HK6T64U horizontal lines

                      Originally posted by JackUzi View Post
                      Hi, sorry for posting on an old thread but I have the same TV and sounds like same issue. I'd like to get this fixed rather than bin it. Did you ever resolve it please?
                      What exactly is your issue/s?

                      Comment

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