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LCD Black

Discussion in 'Electronic Repair' started by Sam Goldwasser, Aug 7, 2003.

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  1. Just about everything. Power supply, logic, wiring, etc. If the screen
    is totally black, then the backlight still isn't working since there would
    always be some leakage for dark pixels. If there is low level light all
    over, then the backlight is working but the LCD drive circuitry isn't.
    Sometimes you can shine a bright light at the screen and faintly see the
    display if the drive is functional but the backlight isn't.

    --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
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  2. Florian

    Florian Guest

    Hi,

    I have a LCD display that has the following symptoms. You turn it on and
    the power light comes on. The monitor detects whether it is connected to
    a computer (the light flashes or is always on) but the screen is black.
    You can see absolutely nothing.

    I tried replacing the inverter (this is the first time I ever attempted
    to repair a LCD - but's it's a touchscreen and was rather expensive) but
    that didn't have ANY effect.

    What else could be wrong with the display, assuming it's not the main
    circuit board since the power light works correctly?

    Any hints are welcome, thank you!
     
  3. Dave D

    Dave D Guest

    Sounds like either the backlight tube has failed, or the inverter isn't
    getting either a supply or volts on the brightness control pin.

    Dave
     
  4. Florian

    Florian Guest

    I have a LCD display that has the following symptoms. You turn it on and
    Is it possible for me to find out whether the backlight is working or not?
    Should I use what Sam suggested - putting a bright light towards the screen?

    Thank you.
     
  5. Florian

    Florian Guest

    I have a LCD display that has the following symptoms. You turn it on
    I don't think that the power supply is bad since some basic logic is still
    working (like plugging the VGA cable in). Maybe it is the backlight after
    all? I will try to see if the screen works with a flashlight.

    Thank you.
     
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