Not certain of model number. Trouble started last night when I hit auto channel line up. Cable and TV were previously working fine. No video or audio through cable box setup. Depressed auto channel line up, which appears to have caused problem. I couldn't get TV menu screen to show up until I just did a minute ago. I attempted to stop TV from auto channel setup and inadvertently started it up again. I have switched TV off to reset it and try again. This time I'll skip over the auto portion and see if this corrects the problem.