Why do you say LG audio if the sound bar is Sony?
How is the Sony sound bar connected to the LG TV?
Do you happen to know the model number of the sound bar? And the user manual?
I have an LG model 47LM620T with a Sony sound bar attached. I have BT headphones. Whilst the sound bar is showing BT enabled there doesn’t seem to be anywhere to plug in the headphones base station. Is there a solution.