Suspect T-Con board or ribbons

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  • The_Dingman
    New Member
    • Sep 2012
    • 2
    • United States

    #1

    Suspect T-Con board or ribbons

    Hi everybody!

    I picked up a Sanyo DP42849 LCD tv at a thrift store for $20 as it was not working properly. I figured that for that price, I could likely part it out if I couldn't get it working... But I need a TV for my basement, so I want to fix it.

    The initial problem was that the left half of the screen worked perfectly and the right half stayed black. The backlights work and the panel is not cracked.

    After some playing around, I accessed the T-con board and the two ribbon cables attaching the T-con to the panel. After playing around with them with the set on, I have multiple intermittent issues.

    First, I have gotten signal to the right half of the screen, which tells me that the panel is good. When I have a good connection, the right side looks perfect. The problem is that the left side is fine for the first 20% of the screen, then from the 20% point to the center it has vertical lines. Playing with the ribbons gives multiple results from changing color of the lines to losing signal all together.

    A few questions:

    Do the two ribbon cables carry signal to the two halves of the screen? It seems that the left side ribbon carries more than the right.

    Should I try ebaying a new T-Con or ribbons? There is effeminately more change when shimmying the cables at the T-Con than at the panel.

    Any other ideas?

    Thanks in advance!
  • smartjohn
    Senior Member
    • Feb 2013
    • 116
    • USA

    #2
    Re: Suspect T-Con board or ribbons

    Hey Dingman.. I am dealing with exact same issue on DP42849. Did you ever find the fix? Thanks!

    Comment

    • The_Dingman
      New Member
      • Sep 2012
      • 2
      • United States

      #3
      Re: Suspect T-Con board or ribbons

      Sadly, no. I still have the set sitting disassembled in my family room.

      I tried a new T-con board from ebay, and it didn't help. I tried new ribbon cables, and no change. So far, the best I've gotten is for all but about a 1 inch strip of the screen to work, if I hold the cables in just the right way.

      I'm thinking it's a lost cause.

      Comment

      • cadiman
        Badcaps Veteran
        • Mar 2010
        • 397

        #4
        Re: Suspect T-Con board or ribbons

        It`s not the t-con.

        The first problem is Sanyo.

        The second is the panel.

        First try to clean and properly set the ribbon cables.

        If that doesn`t work you have either a mainboard issue (not really) or a panel issue (most likely).

        Comment

        • 120volts
          Senior Member
          • Oct 2013
          • 57
          • USA

          #5
          Re: Suspect T-Con board or ribbons

          Fixing electronic stuff is very educational.
          I've been repairing electronic stuff for 30 years and I find it's a constant battle.
          Due to temperature expansion differences between materials such as the plastic ribbon cable to the glass screen conductivity problems will accrue .
          I have two TVs her with this problem. I've seen techs put rubber strips between the LCD screen and frame to keep pressure on the ribbon cable with good results
          The Last TV I fixed with a 1/3 image screen was just tarnish on a ribbon cable.
          Last edited by 120volts; 10-26-2013, 09:49 PM.
          Dan "TV Tinkerer"

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Suspect T-Con board or ribbons

            I use thermal interface pads.
            https://www.badcaps.net/forum/showthread.php?t=25371
            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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