Toshiba 37AV50U - Distorted Picture

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  • Dgtech
    E. Technician
    • Apr 2009
    • 1462
    • Steeler

    #1

    Toshiba 37AV50U - Distorted Picture

    Ok, this one was a repair. At first, the set was turning on (LED changes state from red to green) without any picture at all. After troubleshooting, I narrowed it down to the mainboard. I replaced it and now it turns on with the picture below. OK, now it looks like it may have a bad Tconn as well. I swapped the Tconn, no change. Just for the heck of it, I ordered another mainboard, no change.

    The only two boards I didnt change were the power and Inverter but I can't see how they could affect this.
    Attached Files
    The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Toshiba 37AV50U - Distorted Picture

    A bad power supply could cause this problem. One particular case I dealt with was a low 5V rail causing the T-con to get a bit dizzy. It caused similar effects to what is shown in the picture.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • Dgtech
      E. Technician
      • Apr 2009
      • 1462
      • Steeler

      #3
      Re: Toshiba 37AV50U - Distorted Picture

      Thanks for the reply, I will recheck the 5V.
      The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Toshiba 37AV50U - Distorted Picture

        Originally posted by Dgtech
        Thanks for the reply, I will recheck the 5V.
        Check other rails, too. A low rail could be causing a buck converter or LDO on the main board to drop out of regulation.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • Dgtech
          E. Technician
          • Apr 2009
          • 1462
          • Steeler

          #5
          Re: Toshiba 37AV50U - Distorted Picture

          I checked all rails.All power seems normal on regulators on mainboard.
          The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

          Comment

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