Toshiba 50l7300u, looking for advice. Thank you

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  • Big_KP
    New Member
    • Feb 2020
    • 4
    • United States

    #1

    Toshiba 50l7300u, looking for advice. Thank you

    Good Day everyone,
    Kp here, so I was out to hang a tv on the wall for a customer two days ago. I arrive and there is already a tv on the wall and a new one in a box. I hung the tv for the customer and she asked me to take the old one away. I gladly took it away for her.

    Long story short I thought fixing it would be a cool father and son project. I have been scouring BadCaps trying to find answers, I have found a lot of good posts and furthered my knowledge.

    So about the TV, I plug it in and it is in an on state immediately. A solid green light on the front of the TV. It previously had a black screen, a flashlight test revealed no display. I was testing voltages and determined the BLON signal voltage was low. I disconnected the PWM DIM circuit and I now have backlights.

    I still have no display, and the power button on the set and remote neither one seem to work. I have downloaded firmware and installed files directly to the root of a USB drive installed the USB drive and plugged in the set, nothing seems to happen.

    SO I have a still unrepaired television and I'm not sure what to test next. Any and all guidance would be appreciated. I look forward to hear your responses and resolving these issues.

    Thank you
    KP
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: Toshiba 50l7300u, looking for advice. Thank you

    Uploading good clear pictures of the whole backside of the TV showing all the boards will be the first so we can see what we are dealing with.
    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

    • Big_KP
      New Member
      • Feb 2020
      • 4
      • United States

      #3
      Re: Toshiba 50l7300u, looking for advice. Thank you

      Here are pictures of the boards and chassis. Well it won't let me upload them directly. I'm going to put them in a album under my profile.

      Comment

      • Big_KP
        New Member
        • Feb 2020
        • 4
        • United States

        #4
        Re: Toshiba 50l7300u, looking for advice. Thank you

        The Led on the mainboard is flashing 3 times repeatedly, I can't find any info on this, I assume its a diagnostic light but I can't find a list of codes. Also when I disconnect the top left communications cable on the tcon board I get black and white vertical lines on the screen. Here is the link to my album for the tv.

        https://www.badcaps.net/forum/album.php?albumid=250

        Comment

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