The only thing that comes to mind is a similar, but not exact problem I recently had. If you're using cable try to change out the cord and/or the splitter with a higher grade. You can check to see if either of these is the problem by hooking the tv up to the original cord coming into the house. If the line disappears you know it's somewhere in the connections.
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If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
thin lines are associated with the connection of the pixels on the screen in the grid. If its under warranty get it fixed before expiry as its not a cheap fix. Red lines are not convergence problems they are component problems so you cant adjust it out
A line on an LCD, either horizontal or vertical usually means the video driver board is defective or the screen is defective, does it show up as black even on a dark screen? That means a line of LCD "shutter"s is not working and there is a problem that cant be fixed by a reboot or channel change. Bummer.
Your driver transistors are failing on those "Rows" of Pixels.. a common problem .. you could try "Pixel Reviver" software from here http://www.wikihow.com/Fix-a-Stuck-Pixel-on-an-LCD-Monitor see if that helps.. but it possibly is on the way out sorry..
I know I have seen thin lines in the past on older CRT monitors, these are usually wires which support the aperture grill.
LCD is just a panel so this must be something different. What color is the line? It is probably an error in the scanning process.