If there is no sound via the headphones
Reconnect the headphones
Reconnect the Headphones cable to the headphone jack of the TV and make sure the cable is plugged in firmly.
Check the Headphone/Audio out setting.
Note: To check the type of your TV, refer to the How to check if your BRAVIA TV is a Google TV™, Android TV™, or another TV article.
Is the problem resolved?