Call Yamaha for troubleshooting. I think you're missing a step somewhere, but without the soundbar in front of me I'm not sure what it is.
My soundbar has different inputs for optical and RCA, so I figured that would be something you'd have to consider. Not on the TV, on the soundbar. Heck, my soundbar wasn't playing sound because I was on 5.1 on the soundbar when I was supposed to be on 2.1.
Maybe whatever source you're playing from also needs an option change. I know PlayStation always requires that.

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