Read this if your new Apple TV is messing up your TV or receiver
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Can't figure out if there is a HDMI-CEC setting on tv. I have the Costco TCL 55S434 and plugged Roku Streambar Pro into the HDMI (ARC) and I can't power it on/off
西田宗千佳のRandomTracking】驚くほどサイズが違う! 性能アップでも「お手頃」になった新Apple TV 4K - AV Watch