KDL-52S4100 sound but no video

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  • cuda71
    New Member
    • Jun 2016
    • 3
    • USA

    #1

    KDL-52S4100 sound but no video

    I am trying to fix my neighbors TV and I suspect it is the display. It has sound and no video there is backlights and a green power light. The pico fuse FP1 on the T-Com board was bad so I bought a replacement T-Com board. I checked the new/used boards fuse and it was good so I installed it and still no video. I pulled the new board and the fuse was blown now. I installed the original and connected a temp external 3A fuse and still no video and now no back lights. I disconnected the FPC_right ribbon cable and the right side was all white and the left side had menu messages. i then connected only the FPC_left ribbon and when I connected the temp fuse the back lights would go out and no picture. Same results with both cables connected. I suspect its something in the display itself that is drawing to much on the right side but I do not understand why the temp external glass 3A fuse does not blow and when both ribbons are connected and I have the fuse connected I loose the backlights. Are there any components in the display that can be replaced? There is a narrow pcb along the top that the ribbon cables connect to but I can only see it from the edge Any help is greatly appreciated. Could the problem be elsewhere or does it sound like the display is bad and un repairable?
    Thanks
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: KDL-52S4100 sound but no video

    Sounds like shorted circuit in the panel, you can try checking tan color rectangular caps (MLCC) for shorts, you may be lucky, but if you have shorted driver ICs on the flexible PCB between the glass panel and the tab bonding PCBs then there is nothing you can do.
    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

    • cuda71
      New Member
      • Jun 2016
      • 3
      • USA

      #3
      Re: KDL-52S4100 sound but no video

      Thank you! Where are the capacitors? On the Bonding strip along the top? if so how do you get to it?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: KDL-52S4100 sound but no video

        Originally posted by cuda71
        Thank you! Where are the capacitors? On the Bonding strip along the top? if so how do you get to it?
        The long boards along the top, you will have to remove the metal frame from the LCD screen to get to it.
        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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