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Defective Monitor

Discussion in 'Electronic Repair' started by Nikki, Dec 9, 2005.

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  1. Nikki

    Nikki Guest

    Hi Guys
    Is anyone in this group knowledgeable about computer Monitors.
    If so I have a question.
    I have a 4 1\2 year old 19 inch Monitor (tube type) by ViewSonic for
    awhile now the display has being somewhat dime. I have the brightness
    at 100% and it’s still hard to make out parts of a jpg that have dark
    colours in them. In your opinion is the monitor worth fixing. If it’s
    a component that could be changed for around $100 I would get it fixed
    or is this type of problem related to the picture tube itself.
    Thanks for any advice
  2. Guest

    The Master needs to know if other things are dark as well?
  3. Nikki

    Nikki Guest

    Yes the monitor is dark all the time for every thing of course we dont
    notice it as much when we are using MS Word or Excel because the back
    ground is white. but any thing with colour in it is dark even the task
    bar on my desk top e.g. I use Firefox and the icon is on my quick start
    I can hardly make out the tail thats on the top of the icon. I just
    noticed I have a windows XP default background on my desk top its of a
    pic of a fall season with trees and leaves I have this window open but
    reduced in size so I can see about 3 inches of the back ground all
    around thin email Im typing the back ground appears really dark but hen
    I click on the blue title bar of this email and move it behind and below
    my task bar the back ground gets brighter when I bring the email back up
    the wallpaper gets darker again.
  4. Guest

    There is a Screen Adjustment control on the High-Voltage transformer
    (flyback) that controls the background brightness. Just take the cover
    off, turn the set on and display your normally dim picture. Turn the
    bottom control knob on the transformer and watch the screen. Adjust it
    so that you can just barely see the grey around the sides of the
    Note: the flyback is the black transformer with the big red wire going
    to the top of the picture tube.
    Hope this helps...
  5. James Sweet

    James Sweet Guest

    Does it have a lot of hours on it? The problem could be the tube going
    weak, but it could also be something simple. I've seen bad capacitors
    cause a dark picture, and sometimes resistors in the screen grid circuit
    change value.
  6. Is the onscreen function display also dark?

  7. You might be right, but I'm guessing that this will wash out the

    Too bad it isn't a TV if the CRT is dying, because you can sometimes
    milk 6-12 months with a juiced up scan-derived heater modification. I
    doubt that there are any supplies in the set that are tough enough to
    take an 8 VDC heater tap as an add-on.

  8. Nikki

    Nikki Guest

    Thank guys for all your help I did what jdgill suggested. I took the
    cover off and adjusted accordingly the screen is allot brighter now
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