1. Check the connections on both ends of the HDMI cable. Make sure the TV and cable are securely connected.
2. Check the HDMI port that the cable is connected to on the TV. It may need to be switched.
3. Make sure the cable is HDMI compatible. If the cable is not compatible with the TV, try a different one.
4. Confirm the device you are connecting the TV with is also HDMI compatible and set to the correct output.
5. Troubleshoot the TV’s sound settings and turn off its internal speakers.
6. Restart the TV and the device you are trying to connect.
7. Check the TV’s firmware updates and update to the latest version if necessary.
8. Check the cable for any damage and replace it if necessary.