My screen started doing this all of a sudden. it's a tcl 5 series 43 inch. I've had it a year. Only my xbox one s is hooked up to it. It's done it once before and after unplugging my xbox and factory resetting and messing with it it eventually fixed itself
LCD screen flicker can be caused when there is a loose or failing connection inside of the television set. Sometimes, flicker might appear due to the failure in the connection ribbon or from another electrical component that might be failing nearby. Flickering mainly caused when there is an internal connection problem that may appear continuously regardless of the video source.