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

Roku 4620x only putting out stereo signal via optical output on TV

I have a Roku 4620x. HDMI is plugged into LG 55LF6000 TV capable of outputting Dolby Digital 5.1. It does so with our TV cable box. However, HBO Go and Netflix (haven't tried others) only output in Stereo. Tried various setting fixes. Have I missed something?

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