Grundig 55 GUT 8768_55 (chassis gf) Black Screen, powers on and shows backlight

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  • classypenguin
    New Member
    • May 2022
    • 7
    • Germany
    #1

    Grundig 55 GUT 8768_55 (chassis gf) Black Screen, powers on and shows backlight

    Hello, I bought a Grundig 55 gut 8768_55 (chassis gf) as a defect ‘black screen.

    Now I have started with the basics:

    Fuse intact, LED Tester says 123V, BL Cap has 140V, Mainboard to PSU 12V, 24V, 3.3V and 5.2V are avail+able, 12V and 3.3V at TCON (TV has no seperate Tcon)

    As soon as I switch on the TV, it shows backlight, but a small grey line which disappears again.
    When I tap Menu, the background light becomes brighter. What can I assume is wrong with the TV?
    A defective mainboard? Or a software problem?

    I would be glad of help. I would also be happy to send further pictures and measurement results if required

    Best regards and have a nice evening
    Tobi
    Tags: None
    • Diah
      Badcaps Legend
      • Feb 2013
      • 6346
      • Germany
      #2
      try to capture the small grey line and show us over here..

      take out the speakers.. and have access to the panel buffer boards... you will see at each side at he middle flat ribbon cable like the letters U.. disconnect one side a time and turn on see what you will have on the screen... always photos better than writing

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