You have failing T-CON board (part of the LCD panel assembly), it will get worst with more lines appearing. You can try reseating the ribbon cabel on the T-CON board to see if it helps.
See pictures here: http://s807.photobucket.com/home/budm/allalbums http://en.wikipedia.org/wiki/Capacitor_plague
Answers & Comments
You have failing T-CON board (part of the LCD panel assembly), it will get worst with more lines appearing.
You can try reseating the ribbon cabel on the T-CON board to see if it helps.
See pictures here:
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague