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dell p1110 monitor

Discussion in 'Electronic Repair' started by Bruce Wayne, Jan 3, 2004.

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  1. Bruce Wayne

    Bruce Wayne Guest

    Hey guys,
    anyone know how to adjust the brightness from inside the chasis on this
    monitor..the brightness controls on the front are set to 0 but the unit is
    still a little too bright..I found the focus adjustments with the chasis
    cover off..
    TIA
     
  2. Jerry G.

    Jerry G. Guest

    There must be some kind of defect. If the monitor is new, bring it for
    warranty service. If it is an old one out of warranty, you can try to turn
    down the screen bias (G2 bias) a little bit.

    If you remove the rear cover, the bias control is located usually on the
    back or side of the HV multiplier. It is a small control that would be on
    this module. It should be marked screen. While running the monitor you can
    observe the pix and back the adjustment off a bit. Next it, there may be
    some focus controls. Avoid touching them, unless you want to refocus the
    beam. Some mons have one control for beam focus, while others have two.

    Take care to not touch anything in your monitor. It is easy to cause damage,
    or be hurt. Use a plastic type, non conducting tool to do the bias
    adjustment. This includes that the tool should also have a plastic or
    insulated shaft. If you slip with a metal one and touch some components,
    the repair will be very expensive, or you can also be hurt. Many
    experienced techs do not follow this protocol, but this is taking a chance.

    --

    Greetings,

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


    Hey guys,
    anyone know how to adjust the brightness from inside the chasis on this
    monitor..the brightness controls on the front are set to 0 but the unit is
    still a little too bright..I found the focus adjustments with the chasis
    cover off..
    TIA
     
  3. Wayne

    Wayne Guest

    This is a known problem with the Dell P1110, and there is a hardware
    fix to resolve it. Get someone else to do this if you are not
    comfortable/safe working inside a monitor. Get the download from the
    Sony section at this site...
    http://www.geocities.com/monitorss/schematics.html

    Wayne
     
  4. Bruce Wayne

    Bruce Wayne Guest

    Damn..I am a total noob at this..I have found the focus controls but cannot
    find the control marked screen. It does have 2 focus controls. If anyone
    could point me to it in reference to the focus controls it would be of great
    help...I don't want to get myself electrocuted..LOL

    TIA

    Bruce
     
  5. The thing to try first is to let the monitor warmup then go to the
    color menu and run "color return." (It only lets you do this after 20
    minutes or so.) This is the auto white balance circuit which is
    supposed to set the beam currents to a reference point. That has
    restored proper brightness to a couple of Dell/Sony P1110 monitors
    I've encountered.


    There is no screen control. The two focus controls are horizontal and
    vertical/edge horizontal. This overbrightness problem can be caused
    by the resistor to the G1 pin going high. Or circuit drift may mean
    that increasing the value of the G2 resistor (20 megs) will drop the
    voltage enough to restore normal bias range.

    . Steve ...
     
  6. Bruce Wayne

    Bruce Wayne Guest

    Thanks for all of your help guys....I will probably get a friend who is good
    at component level stuff to take a peek....

    BRuce
     
  7. However, try the menu item for color/color return first. This is a
    user level control which may very well obviate the need for repair at
    all, and it's OFTEN overlooked!

    . Steve .
     
  8. JM

    JM Guest

    Any idea if this also applies to the HP 4576A monitor? I've always thought
    mine seemed to bright even with the brightness at zero. Somewhere in my
    user's manual it mentions the P1110 monitor so I think they must be very
    similar inside. Maybe this is the cause of my other problems, or part of
    them (see newer post re: this). Mine doesn't seem to have a "colour return"
    option in the user menus anywhere.
     
  9. Bruce Wayne

    Bruce Wayne Guest

    the color return option did not help..but you guys were able to assist me
    with fixing the focus on my compaq qvision200 since it dose have both focus
    and screen brightness adjustments inside the chasis...thaks again and happy
    new year..

    Bruce
     
  10. Well that's good ayway. It does like like a relatively
    straight-forward job of changing the G2 or G1 resistor will be needed
    then.

    Ans Happy New Year to you too. <g>

    . Steve ..
     
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