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I have a Valiant 671XH: Screen has lost it brightness and can barely see it. Any suggestions? I have tried adjustments on the computer but nothing.

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There is a small microswitch on most laptops that when the lid is closed turns the backlight off to save power, check to see it's not obstructed. It could also be a faulty inverter which powers the backlight, this will need replacing if this is the case

Posted on Jul 28, 2009

  • Tony Groves
    Tony Groves Jul 28, 2009

    You could always try connecting an external monitor, not ideal but worth a try.

  • rbsmith2000 Nov 29, 2010

    Why not try replacing the bulb. Technical sophistication for this is moderate.

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I too have the same problem with the same monitor.. tv looks great OSD looks great.. pc is dim.. This has nothing to do with the inverter board or the backlight.. I believe that there is an issue with the components that render the Computer video.

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The auto dimming circuit on the ccfl inverter is out.  Replace the inverter and it should cure your problem.  Seek adult supervision for this repair. Do not try it by yourself.
srich

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