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NEC LCD monitor worth fixing?

Discussion in 'Electronic Repair' started by Ken, Mar 1, 2007.

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  1. Ken

    Ken Guest

    I have a 2-year old 17" NEC LCD Monitor (LCD1735NXM), which has
    developed a faint buzzing sound, along with the screen going completely
    pink intermittently. When I tap on the case, the sound changes slightly,
    and the screen goes back to normal for a time.

    I have an electrical background, but before opening the monitor, I thought
    of getting some ideas whether this sounds like a bad soldering connection,
    which may be fixable, or whether this could be the sign of something else,
    and not worth fixing. Thanks for any feedback / experience someone may
    have with these monitors. Ken
  2. With a background, you should be able to work on it. Tap on local areas
    once it is open. Does tapping ever cause the symptom? If it does, it is
    going to be a lot easier to find the area of interest.

    Look closely at all connectors and sockets once it is open. Tap them and
    wiggle them.

    Also, flexing circuit boards with an insulated tool is a good way to find
    intermittents. Cold spray is also used, but I doubt it will be useful in
    your situation.
  3. PeterD

    PeterD Guest

    IMHO, probably a bad wire on a connector. I'd pull it apart and check
    the connectors (the VGA input) wiring first.

    The buzzing may be the backlight inverter. I'd guess it is not
  4. James Sweet

    James Sweet Guest

    Sounds like the backlight tube is bad. The mercury depletes with age and
    you can be left with a dim pink screen. This also changes the electrical
    characteristics of the lamp which may result in the inverter buzzing.
  5. hr(bob)

    hr(bob) Guest

    But tapping would not change the backlight tube mercury or anything
    else within the backlight. Sounds like the previous posters were on
    the right track.

    H. R. (Bob) Hofmann
  6. James Sweet

    James Sweet Guest

    Oops, I missed that part. Yeah look at the inverter if it looks like the
    backlight is going pink, otherwise look for signs of cracked solder
    joints or loose connectors.
  7. Ken

    Ken Guest

    Thanks for everyone's input! Ken
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