Samsung 50" Plasma pn50b450b1dxza VS_ON issue

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  • Seek&Repair
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    • Apr 2019
    • 2
    • United States
    #1

    Samsung 50" Plasma pn50b450b1dxza VS_ON issue

    Hello, all.

    I'm working on a Samsung 50" Plasma and having some issues...

    Firstly = X SUS board - Most of the transistors are shorted. Repair parts are on the way.

    The main issue that I am having is with the VS_ON.

    My logic board doesn't seem to like my current Y Sus board. I have isolated everything and jumped PS_ON to gnd and VS_ON to 5.3v...power supply produces proper voltages at all points...So I know the power supply is good. I connect the main and logic board to the power supply and voltages remain. Connect Y SUS power connector to power supply and all is still well...I connect the logic board ribbon cable to the Y SUS board and I lose my VS_ON voltage. This happens even when Y-Buffer and X SUS are disconnected. Something is afoot with Y SUS board. Any ideas? (and yes, I'm removing power before plugging/unplugging things)

    To recap, the only way that I lose my VS_ON is when I connect the logic board ribbon cable to the Y SUS board. The logic board can be connected to everything else and I have proper VS_ON voltage.

    Intuitively, this tells me that the problem lies with the Y SUS board but, as of yet, I can't find the fault.

    Any ideas?
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