How do I enable Anynet+ (HDMI-CEC) to control external devices?
Navigate to Menu > Settings > All Settings > Connection > External Device Manager > Anynet+ (HDMI-CEC) and set it to On. Connect an HDMI-CEC-compliant device to the TV using an HDMI cable and turn on the connected external device. The device will be automatically connected to the TV within up to 2 minutes.
From the official Samsung TV manual, page 32
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