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HP P1284A 19" PC monitor focus

Discussion in 'Electronic Repair' started by CHale, Dec 14, 2003.

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  1. CHale

    CHale Guest

    Hello--I've got a ~ 2 yr old 19" HP monitor, model #P1284A, that
    started life out a little fuzzy toward the middle of the screen, and
    has gradually gotten really aggravatingly out of focus (there may well
    be a better term for this condition, but that's what it seems to
    everyone in the family; it's just simply not in focus, esp. toward the
    center of the display...). I don't find any "user serviceable"
    control front or back that might address such an adjustment. Can
    anyone here lead me to some straightforward internal means of tweeking
    this? Thanks--Charley Hale, Lafayette CO
     
  2. Jerry G.

    Jerry G. Guest

    In most monitors on the flyback transformer at the HV multiplier there
    should be a pot marked focus. Next to this pot there is usually a screen
    bias adjustment. You do not want to touch the bias adjustment. You will
    find that if the tube is defective, or the multiplier is defective, you will
    not be able to have the proper range to adjust it in. Some monitors have an
    H and V focus pot. One does the horiz axis of focus, while the other does
    the vertical. Normally the focus is peaked at the centre of the screen.

    If you are getting good focus at the centre, and unacceptable focus at the
    sides, then this would be a defect in the dynamic focus circuits, or HV
    multiplier, or CRT itself. To service this, you would have to have the
    proper training, set-up, and service manual for your monitor. I can tell
    you in advance that if the CRT is defective, your monitor would not be worth
    servicing.

    If the flyback is bad, this would depend on how much you want to invest in a
    monitor that is out of warranty, and is a few years old. You would have to
    take it to a place that services computer monitors to have an estimate.

    Take care when venturing in to a monitor. You should not use a metal bladed
    screw driver to do adjustments in case you slip. You should use a plastic
    bladed screwdriver for this. We use all plastic bladed alignment tools for
    doing adjustments. If you accidentally touch something, you can either get
    hurt, or cause a lot of expensive damage.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Hello--I've got a ~ 2 yr old 19" HP monitor, model #P1284A, that
    started life out a little fuzzy toward the middle of the screen, and
    has gradually gotten really aggravatingly out of focus (there may well
    be a better term for this condition, but that's what it seems to
    everyone in the family; it's just simply not in focus, esp. toward the
    center of the display...). I don't find any "user serviceable"
    control front or back that might address such an adjustment. Can
    anyone here lead me to some straightforward internal means of tweeking
    this? Thanks--Charley Hale, Lafayette CO
     
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