I've seen this problem before and if caught early (usually only a few pixels), its fixable. But if it has already started forming a "line" it might be too late and you might have a defective LCD panel. Most of the time, doing the factory initialization helps with this problem.
(WARNING: THIS GIVES YOU ACCESS TO
THE SERVICE MENU. DO NOT ADJUST ANYTHING IN THE SERVICE MENU OTHER THAN
WHAT I PROVIDE YOU IN THESE INSTRUCTIONS. IF YOU DECIDED TO ADJUST
ANYTHING OTHER THAN WHAT I PROVIDE YOU IN THESE INSTRUCTIONS, I WILL
NOT BE RESPONSIBLE IF ANYTHING WRONG HAPPENS TO YOUR TV.)
and hold at the same time “Vol –“ and “input” button on the TV set.
holding those buttons, plug the tv back in
- the tv
should turn on by itself, keep holding the buttons until the letter “K”
appears. Then let go
at the same time press “Vol –“ and “Ch. Down”, you should see the service
menu appear (if it does not appear, try pressing the two buttons again, it
needs to be exactly at the same time)
use the “Ch. Down” button to navigate down the service menu until you see “Industry
Init” (NOT Industry Init +cause)
press “Vol +” to toggle it to “ON”
- Then “/////////////////”
the screen turns GREEN, unplug the TV. Wait about 30 seconds, then plug
the TV back in.
continue on with the initial setup again.