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 TV = NO 5.1 sling app, but YES 5.1 other source

so i just bought a tcl 65" roku tv.  when i watch tv via sling or prime i get no 5.1 surround.  when i watch digital movies via plex i do get 5.1 surround.  previous to this tv i was using an external roku box and i would get 5.1 surround using ALL apps.  i have tried different audio settings and that has had no difference.  i'm using the same stereo receiver (sony str-dh750) which supports arc and dd+.

because the only real difference is using built in roku vs an external box, deductive reasoning says it's a roku issue, and not a tv or receiver issue.