Facing TV Problems? Ask a TV Technician.
Hi and welcome to JustAnswer, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Which Roku version please? Is it connected to a power source as well?Initially, have you check / tried the HDMI port at the back? It is HDMI 1. The port on the side is HDMI 2.
Still and even if connected to the side, have you tried pressing on the TV's SOURCE button? ...then ▲/▼ a couple of times until HDMI 2 is selected? ...then the OK button?
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