Colored vertical lines

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Is the vertical line always at one location ? (on the screen)
If so, it appears that the video card/driver (on your PC or laptop) may be causing the line to appear occasionally ... i.e. flaky ... and it will likely fail (completely) in due time. To confirm it's the video card, try using another monitor (long enough) to see if it happens.
[ The line may also be caused by "dead" pixel on the screen ... but this usually happens on randomly located pixels on the screen, not on one vertical line. But, it may also be a possibility ... in which case, using a different monitor may prove it one way or the other ]

check your LCD connectors. also video memory.

You need to replace the control board

Full instructions from DELL at:

http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&docid=FC55E86F0611BEE3E030030ABD620A8C&l=en&s=gen

Please rate this response thanks.

put a towel across the top of the tv so it can heat up faster and you will get your picture. be carefull!!

try to restore ur fone manually.
that should work

Check for poor soldering around Vertical Driver Ic.

This is caused by the driver tabs between the LCD panel and the controller board that runs it inside.
In general, it is not a repairable thing, and can be very expensive to repair if you choose to go that route.
Please note this is not the video card that is inside the monitor,(where your cable from the PC connects to the monitor) but the actual driver board for the panel.

Sounds like a problem with the LCD assembly or cable. You may want to reseat the LCD cable at the LCD end. It could be a loose internal connector in the LCD assembly.
Ron-