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The LCD is barely illuminated, almost dark. - Computers & Internet

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Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Posted on Sep 18, 2010

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LCD screens have a backlight. When the backlight starts to dim it will eventually completely fail, causing the image to be really dark, barely viewable. You will need to replace the LCD screen, or replace the entire unit.

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The back lamps that provide the illumination of the
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If you hold a flashlight up to it can you see what is on the screen?
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Most of the time in this situation, the problem is due to the backlight going out. However, there are some instances where the inverter cable is bad.

The backlight is the part of the LCD which illuminates the screen. Think of an LCD as having multiple layers. One layer has the image itself on a semi-transparent layer and then behind that layer rests the backlight (usually a florescent bulb) which shines through all other layers to make the image glow and illuminate.

More info can be found here:

http://en.wikipedia.org/wiki/Backlight

As far as replacing the backlight, I always replace the whole LCD itself, which includes the backlight.

Otherwise, you risk ordering the backlight and finding out that it was the connection from the backlight to the LCD that was causing the problem (very possible) and then you would have to order the LCD anyway.

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Sounds like you need a new backlight. Check lcdparts.net

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I didn't have to connect the illumination lead. If you have the battery wires(yellow) connected, the screen will light up pretty bright. When I connected the illumination wires(orange), I got the same dim screen light effect.

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I HAVE ONE SONY MONITOR MODEL SDM HS75.
IT IS SHOWING LED BLINKING FAST NO DISPLAY IF CAN ANY BODY HELP ME TO SOLVED MY PROBLUME.
ASHOK MY CELL NO.09322133048
email.ashoksharma4@gmail.com

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