1. Check if the volume on the TV itself is set too high
2. Make sure that the HDMI cables connected between the source and the TV are firmly plugged in
3. Check the volume of the source device
4. Make sure the audio configuration of the system or the output mode is set correctly on the source device
5. If your problem still persists, try switching the audio output port on the TV
6. If you are using an external audio system, check the volume, settings and connection of the audio system.