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First I would look at the HDMI to make sure its the proper 4k HDMI with Ethernet, then second look at your TV's settings to see if your Sound settings are turn off on the TV and set to EXTERNAL Source. Which will help communications of the devices you have, next make sure your connection to the TV is directly connected to your HDMI input that will say something like ARC for SONY, Simplink for LG, and whatever yours says for the Roku TV. Good luck hope those ideas check out for you !
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