1. Check your internet connection.
2. Make sure your HDMI cord is securely connected to the TV and any other device.
3. Turn your TV to the onboard tuner or source.
4. Check your TV settings to ensure the highest picture resolution it supports.
5. Check your TV input settings and make sure that your TV is set to the proper HDMI port.
6. Try disconnecting and reconnecting the HDMI cables.
7. Check for any software updates from your Smart TV menu.