My god... I finally figure it out.
Ok first thing first.
My system is 7.1 pro
Apple tv4k & shield tv (2017)
Lg 86uk6570 TV
Here are symptom number 1
When play lpcm5.1 contents with apple tv, rear speakers do not make any sound.
If I hit direct button on remote twice then rear speakers work.
I did hard reset several times not helping at all.
How did I solve this mystery?
SSE OFF--------was the answer.
If anybody have netflix, find content name 'test patterns' play that content. This content will test your sound system, too.
If you turn on SSE, You will hear 'left surround channel' but sound coming from front left.
BUT turn off SSE, then everything sounds right.
Symptom number 2.
Play any 5.1 contents with shield tv with SSE turned on, your front left sound would come from front left and REAR LEFT. same happened with right channel. Turn off the SSE then everything work great.
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