Step-By-Step Procedure:

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NOTE: Play a video content with 5.1 surround first (e.g Stranger Things on Netflix or Amazon Prime Video) before setting up audio output format

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Setting Audio Format (For TV Broadcast and Netflix)

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1. Press Settings (Gear icon) button on the TV remote control

2. Select All Settings on the menu

3. Select Sound tab

4. Select Sound Out

5. Select Audio Out (Optical/HDMI ARC)

6. Under Digital Sound Out option, set to Auto