Toshiba Regza 57Z3030D dark patch on screen when cold

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  • TrustyBear
    New Member
    • Oct 2011
    • 5

    #1

    Toshiba Regza 57Z3030D dark patch on screen when cold

    I have a Toshiba Regza 57Z3030D, when cold, there is a dark patch down the centre of the screen, not blank, but darker than the outer edges.

    As the set warms up, (about 30 mins) the screen flickers, and the image becomes perfect.

    I have checked the psu outputs and they all seem within tolerances.

    where to look next, inverter, ccf tubes, main logic?

    Has anyone any experience on large Toshibas who could guide me the right way?
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Toshiba Regza 57Z3030D dark patch on screen when cold

    This is a classic case of bad tab bonds. It's sometimes, but not always fixable. The LCD panel is faulty and this is a very expensive part.

    http://www.youtube.com/watch?v=zW998RTAq-0
    http://www.youtube.com/watch?v=vCExlSnG4yY

    The same problem manifests itself in different ways. Sometimes you can get dark patches which warm up and the TV behaves fine. Other times, one side is permanently slow to change and does not work properly.

    A simple way to verify the diagnosis is to apply a little pressure to the top of the TV and see if the picture fixes itself.
    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

    • TrustyBear
      New Member
      • Oct 2011
      • 5

      #3
      Re: Toshiba Regza 57Z3030D dark patch on screen when cold

      Thanks for that, it looks like that could well be the problem.

      I will post back when I have tested the tabs.

      Comment

      • TrustyBear
        New Member
        • Oct 2011
        • 5

        #4
        Re: Toshiba Regza 57Z3030D dark patch on screen when cold

        Just a thought, but could a Philips 32PFL5522D/05 that shows a red screen when cold, and comes right after about 30 minutes be the same thing?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Toshiba Regza 57Z3030D dark patch on screen when cold

          Originally posted by TrustyBear
          Just a thought, but could a Philips 32PFL5522D/05 that shows a red screen when cold, and comes right after about 30 minutes be the same thing?
          Quite possibly. I had a Philips TV with a similar problem to your Toshiba but not that bad, as it cleared itself after about 2-3 seconds.
          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

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