Oh, ok, now I'm with you. The link you gave refers back to its own posting, but now I recall this restriction in the SA8300. Well, I must be remembering the earlier situation when I had the 8300 connected to my TV with component cables, rather than HDMI. Sorry about that. I don't actually have an 8300 any longer, and my satellite receiver doesn't have a restriction like that of the 8300.
Getting back to your problem, maybe your AVR has L/R stereo monitor outputs that you could feed into (possible) external audio inputs on your TV?
By the way, why do you want your TV to play sound, anyway? I leave my AVR on all the time and never use the TV speakers.