Can you please tell me how did you resolve this with Roku. Give more information as I am also having same issues with my Onkyo Receiver TNX 757 Receiver. I am not getting any sournd from the TV Apps(YouTub, Prime Video) from my Surround speakers. My Speakers are connected to Receiver and all my devices are connected to Receiver. Except the Cable TV Box and Google TV nothing else is working. I tried Amanzon Fire TV directly connected to Receiver and no video but sound is coming.
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