Question about Dell Inspiron 6400 Notebook

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Hi. i am using Dell inspiron 6400. i have been using it for more than a year now. since yesterday i am experiencing a new kind of problem. my display was working fine untill yesterday. i have windows XP as well as ubuntu. in the boot menu, the option screes appears, for choosing ubuntu or windows. i normally use windows. but yeaterday, when the selection screen came on, the display went from black to reddish kind of colour, then pitch black. i immediately turned my laptop off. then later i restarted and the same thing kept happening. then as soon as i turned it on again, i reduced the brightness to the minimum level and the display remains. but with red as the main colour. all the black stuff on my laptop appears red with reduced brightness. i have managed to connect it to my tv with the tv out cable, but the display is not coming on again. please help.

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  • smka_khalid Dec 31, 2008

    thankyou soo much. your answer really helped.

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Sounds like you have a failing backlight. The flourescent tube at the bottom of the LCD that make the screen bright enough to see will change to a reddish tinge as it goes bad. Eventually the tube will not generate light at all and the screen will go black, but you can still see the image faintly if you use a flashlight at an angle to the LCD surface. You might also hear a faint buzzing sound, just like when an overhead flourescent goes bad.

Replacing the backlight is a tedious and difficult job. First the LCD panel has to be removed, and then it must be disassembled to get to the backlight. The tubes can be purchased on eBay but they are leaded glass and very thin, so they tend to break easily. There are two contact tips must be desoldered and then the two new ones soldered before the LCD panel can be reassembled and then put back into the upper half of laptop.

For a beginner, it is much easier to replace the entire panel with a new or known good used one. Best bet is to check your warranty first, otherwise a full LCD panel will cost at least $75 plus the labor to install.

As for the TV out, the preferred method is to hook an external by VGA cable to test the video card. You should get full picture with proper colors since the problem is in the laptop's display itself. The TV out jack requires drivers and a functioning XP to display.

Posted on Dec 30, 2008

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