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

Amazing finding re TCL ROKU blurry picture

Few weeks ago I noticed that the picture on my 65 TCL ROKU TV got blurry on different streamings. I checked the network, toggled between WIFI and Wired, rebooted ROKU, checked ROKU OS version, adjusted picture, etc... Nothing helped! Then I connected the TV to ROKU ULTRA via HDMI.

Perfect picture! No comparison with built in ROKU. 
Any idea? Thanks

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