Samsung UE50TU7099U no picture no sound, backlight present

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  • LaPCon_IT
    Senior Member
    • Sep 2022
    • 78
    • Malta
    #1

    Samsung UE50TU7099U no picture no sound, backlight present

    TV has one combo board (VTT55UH160). Symptoms are like this.Click image for larger version Name: thumb_321499.jpg Views: 0 Size: 1.8 KB ID: 3163034


    When part of the screen is disconnected (white part), it looks like this Click image for larger version Name: thumb_321500.jpg Views: 0 Size: 2.9 KB ID: 3163037

    Resistance and voltages (I don't know if they are good or not). The inductor with 0ohm/0V seems to be connected to GND.
    Click image for larger version Name: thumb_321508.jpg Views: 0 Size: 4.1 KB ID: 3163038

    I haven't noticed any shorts on rails listed below:

    VGH - 30V
    VGL- -9V
    VAA - 14V
    VCOM - 5.6V
    STV - 11.95V
    LC1, LC2 - +30/-12VClick image for larger version Name: thumb_321507.jpg Views: 0 Size: 2.6 KB ID: 3163039

    All CKV lines (no shorts between them) looks the same:Click image for larger version Name: thumb_321506.jpg Views: 0 Size: 2.6 KB ID: 3163040


    I've tried to cover some lines with tape, but the only result was no picture at all (no lines), backlight only. Is LCD panel gone?
    There is this DC-DC converter Click image for larger version Name: thumb_321504.jpg Views: 0 Size: 4.3 KB ID: 3163041, but I haven't found any shorts around it. Also I couldn't find any datasheet.
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