Hi @Bullimk 

https://www.sony.co.uk/electronics/support/televisions-projectors-lcd-tvs-android-/kd-49xg8196/speci...
BLUETOOTH PROFILE SUPPORT

Version 4.1;HID (mouse/keyboard connectivity)/HOGP (Low Energy device connectivity)/SPP(Serial Port Profile)

As you can see from your TV’s specification your KD-49XG8196 does not include the A2DP Bluetooth profile required to connect to Bluetooth headphones. So basically you need a third party Bluetooth dongle to add A2DP support.

Another solution may be to install a Bluetooth App from the TV’s Google Play Store.