KDS 22" Inverter Problems

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  • Solder Boy
    Senior Member
    • Nov 2006
    • 178
    #1

    KDS 22" Inverter Problems

    It's kind of a cloudy day and rainy so I couldn't take decent shots of the board.

    This is what I have done so far.. checked all the caps in the power-inverter board. No visibly bloated caps and they tested ok with ESR meter.

    Original symptom is weird thin plaid horizontal line on screen while it shuts down after 2 seconds. Majority of the small caps on the video board are all bad. Haven't gotten around to replacing them yet ( I will) The caps are the through hole type.

    Decided to check voltages at the connecting block and the voltages at the 2 Schottkey Diodes in the Output section of the power supply.

    The board says +14VDC and + 5VDC and BLON Grd

    Got no voltage reading at 14VDC.. I got 4.7 VDC at +5VDC. Got no voltage at BLON Grd.

    Diode 206 read 4VDC
    Diodge 205 read 12VDC

    Would I be correct in guessing D206 is fubared?

    Thanks
    www.bcrelectronics.ca
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