Question LG TV Optical out no surround sound

Jul 3, 2025
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LG TV - 55UT570PUB
Yamaha Receiver - HTR8140
I have connected TV 'Optical out' to receiver 'Optical in'. In TV settings Sound menu I set TV sound to 'Optical out' and 'wired speakers'
I get sound from TV through the receiver but do not get 5.1 (Surround Sound). Receiver display shows that it is operating in stereo mode (2 speakers) so subwoofer and rear speakers are not functioning. All other connected (HDMI) components (Tivo, Blu-Ray, Firestick) perform correctly with 5.1 working. The receiver does not have HDMI ARC. I want to use the TV as my streaming device instead of the Firestick, but the sound is poor quality because sound is stereo only.

Any thoughts on what's going on?