Samsung UHD TV not putting out 5.1 audio via Yamaha amp.
I apologize if I didn't find a thread dealing with this issue already, and would appreciate being pointed to one, if it exists. I've seen similar issues from some years ago but nothing current. I don't claim any more than average user knowledge of AV connection issues.
I just acquired a Samsung UN55MU7600F. (Not something I would ordinarily have chosen, but Amazon made me an offer that was hard to refuse.) Incidentally, I don't find this unit among those listed on Samsung's site, though tech support confirms that is a correct model designation. I expect that the forum experts can tell what series this particular tv falls into. (I'm not in love with the picture quality, but that's a side issue.)
The immediate problem is that: When connected to my Yamaha RX-V479 amp, there is no 5.1 sound. I get 2.1 only. This occurs regardless of whether using HDMI ARC or optical cable. I have verified that, when using ARC, the HDMI cable polarity is correct and it's in the designated ARC port on the tv.
This problem occurs with all sources through the tv, whether broadcast or streaming apps. (I assume that at least some broadcast and streaming is 5.1 and that is not the issue.) The same streaming content and any disks played via my Samsung Bluray player through the Yamaha amp are rendered in 5.1, so it's not the amp or speakers.
I just spent 45 minutes online with Samsung tech support and no resolution was found. The only way to produce sound output through all available speakers is to use DTS Neo 2:5--which I believe is a simulation (correct?). PCM and Dolby are 2.1, only.
Is this a known issue with Samsung TV's, Yamaha amps, or the combination?
I'd appreciate any suggestions for a remedy, before I disconnect this thing, turn it to the wall and go back to my aged but beloved Panasonic plasma.