connect lg soundbar to pioneer tv

Can not really help you with that plethra of informaiton you gave.
What models are the sound bar and tv becausae LG has made more then 1 soundbar in the last decade and pioneer has made more then 1 TV.

What inputs does each one have?

How have you tried to connect it?

How did you get sound before?

Have you gone in to your TV and changed audio settings for extrnal audio output?

Have you looked at the soundbar and tv manuals?