HITACHI 55HK6T64U horizontal lines

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  • sordids999
    Badcaps Legend
    • May 2013
    • 2158
    • uk
    #1

    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
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #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

        • sordids999
          Badcaps Legend
          • May 2013
          • 2158
          • uk
          #3
          Re: HITACHI 55HK6T64U horizontal lines

          Video uploaded

          https://youtu.be/INxS6q6T8Wo
          Attached Files

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12274
              • U.S.
              #4
              Re: HITACHI 55HK6T64U horizontal lines

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

                Comment

                • nomoresonys
                  Badcaps Legend
                  • Jan 2013
                  • 12274
                  • U.S.
                  #5
                  Re: HITACHI 55HK6T64U horizontal lines

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

                    Comment

                    • sordids999
                      Badcaps Legend
                      • May 2013
                      • 2158
                      • uk
                      #6
                      Re: HITACHI 55HK6T64U horizontal lines

                      Sorry been busy I'll check this week and update

                        Comment

                        • sordids999
                          Badcaps Legend
                          • May 2013
                          • 2158
                          • uk
                          #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

                            • nomoresonys
                              Badcaps Legend
                              • Jan 2013
                              • 12274
                              • U.S.
                              #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

                                • JackUzi
                                  New Member
                                  • Nov 2023
                                  • 5
                                  • United Kingdom
                                  #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

                                    • Davi.p
                                      Hobbist Tech
                                      • Sep 2009
                                      • 4456
                                      • Italy - Milan
                                      #10
                                      Re: HITACHI 55HK6T64U horizontal lines

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

                                        Comment

                                        • nomoresonys
                                          Badcaps Legend
                                          • Jan 2013
                                          • 12274
                                          • U.S.
                                          #11
                                          Re: HITACHI 55HK6T64U horizontal lines

                                          Originally posted by JackUzi
                                          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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