Sony NSZ-GT1 - Manual (Page 58)

Make sure that each device is connected correctly.
Make sure that all the connected devices are turned on.
Pictures may not be displayed using the connection method above for some Cable/Satellite
Boxes. In this case, reconnect the devices using the connection method in Method 2.
Pictures may not be displayed properly because of the copyright protection feature of some
Cable/Satellite Boxes when the Internet TV Box and TV are connected with HDMI cables via
an AV Receiver. In this case, contact your Cable/Satellite TV operators.
Tip
See related links:
IR Blaster Settings (Preparing to Control an AV Receiver)
IR Blaster Settings (Preparing to Control Other Devices)
HDMI settings
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Method 2: Connecting an AV Receiver without HDMI jacks
Use the IR Blaster cable to control connected devices with the Keypad.
To output the sound from the AV Receiver, press Fn + 1 and select [Picture & sound] - [Audio
output priority] - [Optical].
To enjoy surround sound from a Cable/Satellite Box, see below .
Note
When you make a connection with this method, DTS-HD and Dolby TrueHD surround sound
NSZ-GT1 58