OK, I'll repeat what was posted here previously. There is no way for any device connected to a display's HDMI input to interact in a way that would cause one or the other to not function. In the TV's case, the only thing I can "do" to the Roku is complete a video handshake of the HDMI connection, and acknowledge any CEC messages sent from the Roku. By CEC, I mean using the Roku volume control to turn the TV sound up or down, or to cause the TV to change to the HDMI input used by the Roku if the home button on the Roku remote is pressed. That's really the only CEC functionality that exists with a Roku player.
The TV cannot send any signal into the Roku to control it in any way. That functionality simply doesn't exist. You can't use the TV remote to control action on the Roku. There's nothing on the TV that would interfere with the Roku's network connection. There's nothing the TV can do to make a channel on the Roku fail. There's simply no connectivity between the two that might allow that to happen.
I have a Samsung TU7000 next to me with a Roku Premiere, and a JU7100 in the bedroom with an Ultra 4640 connected. Both Roku players work as expected. The Premiere is connected wirelessly, while the Ultra has a hardwired network connection. I have an Ultra 4800 connected to an LG Nano85 downstairs, and it's used daily without issue.
Dan
Roku Community Streaming Expert
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