I have had a Toshiba 56hm66 for just over 3 years now. I have never had to replace the bulb. I turned the set on today and there were vertical lines from top to bottom across the entire picture. The lines were kind of fuzzy and were about 3/4" wide and maybe 3-4 inches apart. All of the inputs had them.
I unplugged the TV, then plugged it back in, turned the set on, and the lines went away. I wish this was the bulb but it does not sound like it and I can not believe this was a one time occurrence.
Does this sound like a light engine, ballast, or just wait till it happens again? How do you do a factory reset in case this happens again?