I have an sn11rg soundbar, and its found by the discovery, but source change is not detected. It got an app so it should be some kind of API or endpoints. Anyone with LG soundbars that have gotten the integration to work properly. I only get very basic things up
There is probably bug in discovery. I have the same soundbar and it was discovered only as cast device, not as lg_soundbar integration. I edited integration code a bit to add it manually as media_player in yaml and it works ok. You can create an issue on GitHub to fix this.
Never mind, it should be fixed in Add config flow to lg_soundbar by MasonCrawford · Pull Request #71153 · home-assistant/core · GitHub