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HP P1110 Focus problem

Discussion in 'Electronic Repair' started by [email protected], Jun 22, 2005.

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  1. Guest

    Only the vertical lines are out of focus, all colors and black. All
    else is great.
    Tried the digital setup after Password, and have opened the case but
    have not been able to figure out just what controls the focus.
    Thanks for looking, Richard
     
  2. 3T39

    3T39 Guest

    Hello, !
    You wrote on 22 Jun 2005 11:55:59 -0700:

    d> Only the vertical lines are out of focus, all colors and black. All
    d> else is great.
    d> Tried the digital setup after Password, and have opened the case but
    d> have not been able to figure out just what controls the focus.
    d> Thanks for looking, Richard



    I think this is a badged SONY with the 21" Trinitron CRT . There is a focus
    control on the Lopt (line output transformer) Find a large wire with a big
    rubber ring where it attaches to the back of the CRT follow it down to the
    lopt and on the body of the lopt there should be two vertically mounted
    rotary controls, one is the screen Grid the other is the focus. These big
    sets sometimes have the focus control seperate from the lopt. BE AWARE THAT
    THE VOLTAGES AROUND THIS AREA ARE LETHAL. USE A LOOoooNG Insulated crosshead
    screwdriver. keep one hand in your pocket so you can't ground yourself.
    It's best to use a big mirror to check how your doing, because you really
    dont want to stretch around a big set like this with one hand in the HV just
    to see the screen.
    With best regards, 3T39. E-mail:
     
  3. Guest

    Actually most of them have two focus controls, one for verticasl lines
    and the other for the horizontal. Shouldn't be too hard to figure out
    which is which.

    Problem is, if it drifted once it'll probably drift again. Sometimes
    it's not the fly, sometimes it's the CRT.

    JURB
     
  4. 3T39

    3T39 Guest

    Hello, !
    You wrote on 22 Jun 2005 17:08:19 -0700:

    Z> Problem is, if it drifted once it'll probably drift again. Sometimes
    Z> it's not the fly, sometimes it's the CRT.

    Yep, very true, but I'd try a tweak first, it's often enough to last a while
    before component values drift again or the CRT loses it's oomph, and by then
    21" TFTs might be cheap enough to replace it.

    With best regards, 3T39. E-mail:
     
  5. JANA

    JANA Guest

    In many of the Sony monitors, there are a set of focus pots. In most their
    models there is one for the vertical, and one for the horizontal plane. Use
    an insulated non metallic screwdriver to adjust these. If you are extremely
    careful, you can adjust these with your fingers, but take care not to
    accidentally touch anything.

    If the focus has drifted out, there is a defect in the monitor. Either it is
    with the high voltage supply, or the CRT is starting to fail. These two
    types of failures are common in many of these monitors.

    --

    JANA
    _____


    Only the vertical lines are out of focus, all colors and black. All
    else is great.
    Tried the digital setup after Password, and have opened the case but
    have not been able to figure out just what controls the focus.
    Thanks for looking, Richard
     
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