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LCD TV not working - inverter or backlight dead?

Discussion in 'Electronic Repair' started by Greg, Apr 13, 2007.

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  1. Greg

    Greg Guest

    My 17 month 32" LCD monitor appears to have suffered an untimely death
    this evening. When I turned it on, it briefly displayed the screen
    image from the computer but then began making a somewhat high-pitched
    chirps (1 per second) during which the screen flickered. After about
    10 seconds the screen went black, though the chirping continued. Now,
    when I turn on the monitor, although the "green light" on the button
    indicates it is on, the screen remains black and it only emits chirps.

    Does this failure sound like the inverter, backlight, or something
    else (ie. something that I can't replace myself.)?

    Thanks in advance.
    -Greg
     
  2. Arfa Daily

    Arfa Daily Guest

    If you shine a strong light at the screen, can you see an image in there ?
    If so, then the backlight has failed, and the chirping is probably its
    inverter. As you have a steady green light, this would imply that the main
    PSU is working, so not where the noise is coming from.

    Arfa
     
  3. Greg

    Greg Guest

    Yes, that's it. I turned on the TV to do the flashlight thing and the
    screen even briefly showed the computer image before going dark again.
    However, when I shone the light onto the screen, I could just make out
    the image.

    So it is the inverter. Now I've gotta find a shop that either will
    sell me the right replacement inverter or can do it themselves.

    Thanks for your help.

    -Greg
     
  4. Arfa Daily

    Arfa Daily Guest

    OK. You could try looking at

    http://www.lcdpart.com/doc/ccfl.html

    where you might find something suitable.

    Arfa
     
  5. Meat Plow

    Meat Plow Guest

    Depending on how many hours the set has on it could also warrant you
    replacing the ccfl backlight bulbs. I've also read if one fails it can
    prevent the inverter from firing.

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