Sony KD 65x9300D 5.1 set up

Is the Advanced Audio Sound Setting set to "Auto 1"? I think it's set to PCM as default.

Do you only get stereo if you play a DVD (which should have a Dolby 5.1 track on it to start with). Or have you only tried Blu-rays (which may not have DD5:1). I ask purely as a troubleshooting measure.

Hey guys, yes I have tried all 3 settings in tv sound , Auto 1, Auto 2 and PCM. PCM is the only option that will output sound.
I have only tried blu rays so far but will try a DVD. Pretty certain it will only put out a stereo sound if tv output is PCM only! So annoying!!! I used to have Samsung gear and had no issue!
Pretty certain it's because the DVD player has no optical out (only hi speed HDMI) to the TV. My Samsung blu ray had an optical out I had connected to a splitter so could connect to the playbar directly.

If you're using a player (Blueray or DVD), make sure that the output sound on that is set appropriately. It may be, for instance, passing DTS to your TV via the HDMI, which will mean that nothing will show up under the auto1 or auto 2, and only show up on PCM (because it's being forced into stereo).

The problem may not be with the TV or the Sonos speakers, the problem may be with the source!

In all cases, check the sound setup for each device in the chain. In your case, the player that is connected to the TV. Once you've checked that, then check the settings for sound on the TV itself (usually bitstream is best). Then you can be sure that an appropriate signal is being sent out the optical cable to the Sonos, and it should work.

It's a pain to have to look at each device that is connected to the TV and sending a signal along, but you usually only have to do it once. (For instance, you'd need to do it on the Blueray player, the XBox, the PlayStation, etc).

Hey Air- yeah have the setting from blu ray player set so that it has the option of turning DTS into Dolby digital turned on so know that parts correct- but no matter what other setting I select on the TV it still only gives me sound from PCM option.

Hey Air- yeah have the setting from blu ray player set so that it has the option of turning DTS into Dolby digital turned on so know that parts correct- but no matter what other setting I select on the TV it still only gives me sound from PCM option.
I'm not sure you know that for certain, and running a DVD with a DD5.1 track would help to confirm where in the process the problem is occurring. Sony TVs are generally able to pass through DD5.1 so this is still surprising and I can't believe it's impossible to make this work.

Are you sure you are testing the TV audio out settings for the digital optical output, not some other audio output option?

just to help identify the root of the issue - does the TV itself output 5.1 from its own sources (free to air, smart TV apps) or is that PCM also ?

You could try an HDMI splitter and output the 5.1 separately via Toslink, get them at Amazon, check the bandwidth, cheaper ones wont pass 4K.

But heads up if you do decide to persevere with the settings there could still be issues. I had a problem with my Panasonic Viera 58DX902B coupled with Panasonic DMP-UB900, PS4 and satellite STB. I could only get stereo out of any of them until I found the combination of settings that got them all to work together, all 4 required changing. Now then when I did get them to output correctly the lag between the audio and video was horrific, sound lagging vision (possible due to the amount of processing 4K Tv's carry out or possibly that same manufacturer components force their own settings) therefore you "may" find another issue when you do get it working. I chose to take the optical out from all of them via an optical switch.

If the TV is set to PCM it won't output 5.1 at all. On the Sony TV's you must set it to Auto 1 or 2 (I use Auto 1 on mine).

@Slo_Mo_Shun. OP has said his Blu-Ray has no Toslink output.

@Atterking - OP has said he has tried all settings