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Dell/Sony P1110 monitor problem

Discussion in 'Electronic Repair' started by Russ Verdon, Jul 7, 2004.

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  1. Russ Verdon

    Russ Verdon Guest

    I have a Dell/Sony P1110 monitor. The Blue disappeared. I have confirmed the
    tube is ok. I have found 22R CHIP Resistor 314 from RGB amp IC403 O/C and
    Diode D307 from this Resistor to gnd was low in resistance/sc, possibly why
    R314 was O/C. The other components around this circuitry seem ok. I replaced
    the resistor and the diode(with a glass one I got off another old Cct board
    (different type)). The whole screen now has a blue wash and the contrast
    looks washed out. Black and white levels seem to have been lost.
    Disconnecting the capacitor C315 feeding KB looses the blue, but restores
    the crispness to the picture.

    Can someone advise whether my diode is not up to it or is there some other
    effect happening here.

    Thanks for any assistance.

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