Hi there

Taking this from the top, can you confirm the following:

TV:

• The HDMI cable is connected to the ARC port on the TV (HDMI 4 on your TV)?
• And that the HDMI cable is connected securely at both ends
• Is Bravia Sync enabled on your TV.  See HERE for instructions.
• Is the speakers set to "Audio System"?  See HERE for instructions.

Soundbar:

• Is the correct input selected on the soundbar - should be set to TV.  Press the [INPUT] button repeatedly until its selected.
• On the soundbars remote control, Press the [MENU] button and go to "AUD >" and check that "TV AU" is set to "AUTO" - page 15 of the manual.
• Still in the menu, goto "HDMI>" and ensure that "CTRL" is set to "ON" - page 16 of the manual.

Soundbar manual is HERE

Thats it I think.

Cheers