If the audio is abnormal when suing the Headphone OUT port, please follow the below methods to do the troubleshooting:
1. Try to unplug the cable from the TV and plug it back in.
2. Try to change another headphone cable if you have a spare one.
3. Try to change another headphone if you have a spare one.
If the issue cannot be resolved, please feel free to call the TCL hotline for further help.