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

New user/member. 4k stick seems darker than other sources.

New user and new member so go easy on me.

I Just installed the 4k stick and went through the setup.  It detected 4k @ 30 hz and  I'm taking USB power from the TV.  The video seems darker and dingier than from other sources,  For instance. Amazon Prime (Jack Ryan) via the Vizio 4k smart TV and Sony Blu-Ray player is noticeably brighter and more vivid than on the Roku.

Also, is there any way to just have the on/off on the Roku control to control JUST the Roku and not the TV?

Thanks, Skipper
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