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Hewlett Packard HP D8905 Monitor Focus Adjustment

Discussion in 'Electronic Repair' started by Brian, Feb 7, 2005.

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  1. Brian

    Brian Guest


    I have the above monitor and to get a decent picture I have to have nearly
    100% contrast and brightness. At these settings the focus is all screwed up.

    Can anyone tell me where the focus control is - if there *is* one !

    Or is it (as I suspect) just a shot screen.

  2. Jerry G.

    Jerry G. Guest

    If the focus moved off by itself, there are several things that are
    usually common to this.

    Defective high voltage multiplier.
    Focus adjustment pot is drifting due to oxidation, or a defect.
    The CRT is having a defect (usually will get worse over time).

    There is usually a focus pot on the side of the high voltage
    multiplier, which is usually located on the side of the flyback
    assembly. In some monitors, the focus pot is in a separate module, or
    on the CRT board.

    Jerry G.
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