A:Answer Hi BR,
If you are connected to an external device, ensure you are running the correct HDMI source. Confirm that the TV is set to the same source as the external device. For instance, if your Firestick is connected to HDMI 1, set the TV source to HDMI 1.
If you need more help, please call us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. Our LiveChat agents are also available by clicking on the ‘Support’ link on our website.
~ Samsung Advisor