Ask The Physicists: Did I destroy my friend’s TV with a magnet?

This question popped into the Ask The Physicist’s inbox this week. Dear Ask the Physicists. In 1995, I might have ruined my best friend's TV by waving a magnet on the screen. She was really upset. Was I really at fault. Could I have done something to fix it? We are talking about 1995 here and we can confirm that ...