Expertise needed 2 diagnose issue w horizontal lines

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  • danigirl
    New Member
    • May 2017
    • 2
    • Australia

    #1

    Expertise needed 2 diagnose issue w horizontal lines

    SOS...!
    Hoping some1 can spare some expertise on this problem... I have a LG 55LW6500-TA and was watching TV last week. All of a sudden the picture turned into pink thin moving horizontal lines across the entire screen. (Unless there's an external reset button I'm not aware of ) I'm unable to reset the tv as I can't see the menu. On the weekend I took the back off and had a look at the boards - couldn't see anything 'burnt' or any domed capacitors.There was what appeared to look like a 'clot' on one of the ribbons leading from the T-con board to the panel (bottom of the Tv) so I softly rubbed it before turning the tv back on. It now starts with the pink lines for a few seconds but then changes to green / white flickering lines on a black background. As it warms up it tries to display a picture but doesn't quite get there so ends up looking like white flickering abstract images on the screen. I read a comment indicating that horizontal lines usually indicates a bad panel however was holding onto hope given the panel responded to this last action. Any suggestions to pinpoint the issue would be greatly appreciated. The tv's around 4.5-5 yrs old but I've only had it for 6 months and can't afford a replacement. I have recorded it if that'll help. Apologies for the length of this post & thank you in advance!
    2
    Motherboard
    0%
    0
    Panel
    0%
    2
    T-con board (don't think so though)
    0%
    0
    Power board
    0%
    0
    Capacitor
    0%
    0
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Expertise needed 2 diagnose issue w horizontal lines

    There was what appeared to look like a 'clot' on one of the ribbons leading from the T-con board to the panel (bottom of the Tv) so I softly rubbed it before turning the tv back on.
    A photo may prove useful in helping to diagnose.
    Willing to help but I'm no expert.

    Comment

    • mannuoye
      New Member
      • Dec 2017
      • 9
      • Australia

      #3
      Re: Expertise needed 2 diagnose issue w horizontal lines

      Hello Everyone,
      I have a LG 55LW6500 TV and it stopped working suddenly. I had it connected to a computer via HDMI and I was watching a video on YouTube. All of a sudden TV turned off and then it came back on (just the front LED indicator light) but no picture, no sound and no backlights.

      So far, I have checked the power supply voltages and they are correct. I checked the LED backlights by jumping the connectors on power supply board and they are good. Now I think the main board is faulty. Unfortunately LG is not making EBT61555001 main board anymore and I am unable to find it anywhere (not even used one).

      Is there any other main board which I can use to get this TV running again?

      All I want is TV to turn on and connect my computer via HDMI.

      Thanks

      Comment

      • SLK001
        Badcaps Veteran
        • May 2014
        • 264
        • USA

        #4
        Re: Expertise needed 2 diagnose issue w horizontal lines

        If there is no replacement available, you'll have to troubleshoot the MB to the component level.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Expertise needed 2 diagnose issue w horizontal lines

          If you can force the backlights on by isolating the BL-ON wire going back to the main board first and have all other cables back in place and able to get the backlights on but still no images on the screen; that means you have more than just bad BL-ON problem, as indicated, you will need the schematic to troubleshoot down to the component level to find the cause of the problem.
          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

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