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My laptop screen works fine when plugged in, but appears dark running on battery.....

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This is normal behavior for laptops when switching to battery power. Simply increase your screen brightness (Usually done by pressing the Fn button and one of the arrow keys that has a picture of a sun on it).

Posted on Mar 25, 2011

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Hey Lea,
Try the steps below to see if they will resolve this issue that you are having with your computer. If this does resolve the issue you can email me. My email address is listed below in my sigfile.

1) UNPLUG THE LAPTOP
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This is normal behavior for laptops when switching to battery power. Simply increase your screen brightness (Usually done by pressing the Fn button and one of the arrow keys that has a picture of a sun on it).

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Do you get the same result if its plugged in or running off battery? Try holding down the "FN" key or function key and using one of the Function keys i believe its F6 on the sony's to brighten up your screen if that doesn't work try downloading and reinstalling your video driver and finally you may have a video card issue

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Most likely the backlight has failed however replacing the backlight is impractical and the screen should be replaced.

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You can refer to this document for display assembly. It looks like the display is going bad. By checking the seating of the display cable, you're isolating the fact that the cable is connected.

http://support.dell.com/support/edocs/systems/ins6400/en/sm/display.htm#wp1022270


Hope this helps :) Kindly leave a rating. Thanks..

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