I had an issue in which my brad new (2023) LG (75') TV in which everything worked fine, except audio from my HomeRun Tuner. None of the Roku settings had any influence on the HD HomeRun app. It wasn't until I modified my TV settings that audio started working in the HD HomeRun app, while continuing to work everywhere else.
* LG TV remote: Settings -> Audio -> Advanced Settings> Select HDMI Input Audio Format.
- Changed HDMI 1 which was the source of my Roku input from PCM -> Bitstream.
NOTE: After this above I ended up adding an LG sound bar with HDMI (ARC) to HDMI 2 on my TV. It all continued to work after this with the HD HomeRun app.
Under Advanced Audio SettingsSelect your approp. inputChanged from PCM -> Bitstream