Facing TV Problems? Ask a TV Technician.
Hello and sorry you're having problems. I'm just getting online and seeing this question now.
Can you please get me the full model number off of the back of the TV?
Also how long have you owned it for?
As a test, when the screen goes black- please grab the original Insignia remote (not the Comcast remote) and press MENU- does the TV's native MENU also flicker?