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lcd monitor troubleshooting tips?

Discussion in 'Electronic Repair' started by Brandon D. Valentine, Aug 4, 2007.

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  1. I've got a Dell LCD monitor that when plugged in and powered on will
    show a beautiful picture for about 1 second and then goes immediately
    dark. You can turn it off and back on and it will do the exact same
    thing an infinite number of times. Same behavior with any computer
    and with multiple video cables. It also behaves the same way without
    a video signal attached. It will come on and show the self test
    screen for a second, then goes dark. I hate to have to recycle the
    thing when it clearly works, just something is preventing it from
    staying on. I'm pretty handy with a multimeter and a soldering iron,
    but I'm not sure where to start on this thing. Anybody fixed similar
    issues with an LCD and have any suggestions on which component I might
    want to investigate?

    Thanks,

    Brandon
     
  2. JANA

    JANA Guest

    Most of the time, it is the back plane lamps, and the power supply for them.
    These should be changed together. I doubt that DELL will sell you the parts.
    They will tell you to send them the monitor for service, if it is not too
    old to have the parts.

    To prove that it is the backplain lamps, shine a flashlight on the screen,
    and try to see if there is an image.

    --

    JANA
    _____


    I've got a Dell LCD monitor that when plugged in and powered on will
    show a beautiful picture for about 1 second and then goes immediately
    dark. You can turn it off and back on and it will do the exact same
    thing an infinite number of times. Same behavior with any computer
    and with multiple video cables. It also behaves the same way without
    a video signal attached. It will come on and show the self test
    screen for a second, then goes dark. I hate to have to recycle the
    thing when it clearly works, just something is preventing it from
    staying on. I'm pretty handy with a multimeter and a soldering iron,
    but I'm not sure where to start on this thing. Anybody fixed similar
    issues with an LCD and have any suggestions on which component I might
    want to investigate?

    Thanks,

    Brandon
     
  3. Arfa Daily

    Arfa Daily Guest

    Check that the actual screen is still producing an image after it has gone
    'dark' by shining a strong light at the screen at a very acute angle. If it
    is, chances are that the backlight has failed. This usually comprises a
    couple of cold cathode flourescent tubes, and an inverter board to drive
    them.

    Inverters may or may not be readily repairable. If the inverter starts then
    immediately stops, it may well be a cap problem, but it could also be a bad
    tube that is 'overloading' it, and causing it to shut down to protect
    itself.

    Replacement inverters and backlight tubes available here. They can probably
    supply something suitable.

    http://www.lcdparts.net/ccfl.aspx

    Arfa
     
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