i have the same problem with my 2 year old lt-26c31bje.
Have had an independent assesor look at this unit and it has been suggested that the graphics card is not functioning correctly.(but he wasn't quite sure as he was a bit unsure of the technology!)
Still trying to work out if this is actually correct and how to resolve this problem.
there does not seem to be many subject matter experts on LCD TV Faults!
Tiger Boods
June 2007