Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

TCL/JBL 5.1 sync delay

I have a TCL series 6 TV 65R635 and a JBL 5.1 Soundbar. The audio and video between the two devices seems to sync fine with HDMI Arc when watching via the xfinity cable box. I can't get the audio and video to sync when watching off of the built in Roku. Any ideas? Or just return both products and buy a different TV and soundbar? 

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