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KDL-46W905A won't play audio through HDMI 1.3 home theatre
I've connected my W905A to an LG home theatre that is only HDMI 1.3, so I have audio playing through it via optical audio out to get the TV sound go through it. There is nothing else connected to the TV.
When I select Speakers to be 'Audio System' I get 15 seconds of great Dolby sound, then it reverts back saying 'TV speakers actve due to Audio system communication failure'. I've found that when I disconnect the home theatre's HDMI cable from the TV, the audio works properly through the Audio System.
Obviously, I don't want to keep on plugging and unplugging the HDMI cable, so is there a resolution for this?
Thanks.

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Hi there
Im going to assume that your LG Home Theatre is not HDMI ARC compatible - and thats why you have the optical cable connected.
Im wondering if the TV is getting confused here and "attempting" to output audio via HDMI - initially anyhow.
A couple of suggestions to try:
- Ensure that the External Audio settings are correct : HERE
- Try using another HDMI port on the TV - Im assuming you have connected it to HDMI 1 - Try HDMI 2
- Ensure that the settings are correct on the LG System.
Hope that helps.
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Yes, you're right, it's not ARC compatible,
Thanks for the suggestions. Unfortunately none of them have had any impact. I've tried all other HDMI ports. When I change the External Audio selection I get 15 seconds of sounds as it should be, then I get the error mentioned before and it reverts to TV speakers. And there is nothing in the LG home theatre settings of any use.
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I've since found out that if I unplug my home cinema's HDMI cable from the TV completely the sound comes through the optical audio correctly. So now if I want to watch a blu-ray or DVD I need to manually plug in the HDMI cable beforehand. Pretty ridiculous, and not very smart for a Smart TV in 2013! Sony, your TV is defective and you really do have a moral obligation to sort this out.

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have you tried changing the sound on the tv from tv speakers to audio system ?
(remote-options-speakers-change from tv to audio system)