Your television isn’t going to work perfectly forever. Over time, the parts inside a TV set slowly wear out, and although a TV should last at least the length of its warranty (or, with luck, much longer), it’s not impossible for a TV to exhibit strange behavior, like flickering and flashing like a strobe light. Unless you intend to run a dance club in your living room, this behavior is not acceptable.

What Could Cause a TV Screen to Start Flickering Like a Strobe Light  - 34