Facing TV Problems? Ask a TV Technician.
Welcome to the site! I'm Dan. Please reply back so I know you're here. Also, are you with the unit now?
OK. When the screen goes black I want you to grab the original remote and bring up the MENU. Tell me if the menu shows up or not....
OK no rush, that's an important piece of information. Also, are the cable, ROKU, and DVD all connected with HDMI or another type of cable?
The HDMI signals are processed differently from non-HDMI signals, inside the TV. Is it possible to eliminate that difference by connecting something via a non-HDMI cable to the TV?
Yes, let's try component just as a test... not forever. Let me know what you find.
The site should have sent you an email with a link to this question. If they didn't, just come back to the site and click "My Questions" at the top somewhere....