To listen to TV sound through the connected equipment, press
the HOME button, then select [Settings] → [Sound] →
[Headphone/Audio Out] → [Headphone], [Audio Out] or
[Subwoofer].

When you set [Audio Out] in [Headphone/Audio Out],

select [Fixed] or [Variable], press the HOME button, then
select [Settings] → [Sound] → [Audio Out].

HDMI IN 2/MHL

HDMI (High-Definition Multimedia Interface) provides an
uncompressed, all-digital audio/video interface between this
TV and any HDMI-equipped audio/video device. You can also
connect your MHL device using an MHL cable. In addition,
when you connect “BRAVIA” Sync-compatible device,
communication with the connected device is supported.

Be sure to use an authorized HIGH SPEED HDMI cable

bearing the HDMI logo.