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It is line fault. Contact any service technician. 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/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
I had a similar problem with my LCD screen TV, and to my dismay, my warranty just ran out. A thin red line began to appear on the right side of the screen, and since many online and expert sources pretty much say replace the expensive LCD screen or get a professional to fix it (in which I suspect to be a business plot to get people to go to pricey experts), I decided to look for other possible alternatives.
Here is some tips/solutions I was given (and it worked! at least for me):
1) Turn off the LCD and unplug the power source and let it rest for 5-10 minutes. Turn it back on and see if it disappears or improve. (This is the one I used.)
2) While turned off, try jiggling gently all chords connected to the TV (cables, power chords, etc.); you could even try unplugging and replugging the chords/cables. Turn the TV back on and see if the red line disappeared or improve. (This is the one I heard worked for others.)
If the above doesn't work then I'm afraid you do have a bad panel on your screen and will need to call in the experts or get a new TV. I hope this will help. Best Wishes.