Hisense H49M3000 PSU buzzing + Black screen after 20min

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  • EUWest
    Member
    • May 2019
    • 44
    • Germany
    #1

    Hisense H49M3000 PSU buzzing + Black screen after 20min

    Hey Folks just got another Hisense with an unusual Problem.

    After plugging in its starts buzzing on the cold side. Could not located it 100%, but seems like transformer/capacitor.

    TV has 1 horizontal Line, often static. After 10min screen gets flickering and after about 20min screen gets Black while Sound is on. After turning off and on screen appears back for about 5min and then went Black again.

    I checked LED Voltage:
    While Screen is on about 115v
    While Screen is Black also about 115v
    LED Connection unplugged also 115v
    Flashlight test while Black is negativ

    I already replaced an schottky diode 20100 because while its in place 2 Pins shorting.

    What else could i Check?
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