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Compaq presario 900 lcd not working, shows faint image

The lcd is not working, and i can see the images on the screen faintly very faintly. the vga output to external screen works and i have a replacement LCD which also shows nothing but a faint image. what is the solution?

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  • apa11 Jan 30, 2008

    I have the same problem. I can see the screen faintly on my Toshiba M50. I took it to the service center, they said that the video card is working fine and it is a faulty LCD and needs to be replaced. When the lid is closed it goes to hibernate mode and when the lid is lifted once again the screen works fine for 2 seconds. After that I can see the desktop faintly, maybe the back-light isn't working.. Does one have to change the LCD altogether?

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Out put connection from the video card to the LCD monitor is loose or malfunctioning. check the connection that leaves the video card to the monitor, ensure its secure and clean, if still not working then its either the video card or the cable connecting to the LCD.

Posted on Dec 11, 2007

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Look at the LCD screen very closely and check if you can see a faint image on the screen. It's possible that the LCD lid close switch stuck in the "closed" position and the back-light stays off even when you open the LCD screen or turn on the laptop. The switch turns off the back-light when you close the LCD display to save the laptop battery power.

If no luck, try to remove battery and drain the power, then replace battery and turn on.

If that didn't fix it then there are 3 things that could have gone wrong:

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It could be either, if you can get another LCD screen (same make/model) you can swap to ckeck it out.
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Larnold..Sounding like you need to check the LCD Power Inverter Circuit board.. this is located inside the screen a long rectangular circuit board that sends power to the screen backlight & Display Panel.. Could also be a Bad Backlight.. Try Booting it.. Hold it up to a light and look closely at the screen.. If you see a faint image but no light, it is the Backlight, if Just Black No Activity then its most likely the Power Inverter, OR a Bad Video Card.. You can test the VIDEO by Connecting the laptop to a Computer Monitor or similar with the laptops VGA Serial port.. then Use your function Key and Switch to 2nd Display.....(one of your F keys.. ).. If it Shows up on another screen, Its a Display problem and not the video card... Hope This Helps alittle.. Cheers

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If you power it on, take a flashlight and shine it on the lcd at and angle and look real close to see if you can see a faint image. If you can, then your backlight in the screen is not working.
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