Sony WH-XB900N Help Manual page 110

Help Guide
Wireless Noise Canceling Stereo Headset
WH-XB900N
No sound
Check that both the headset and the connected Bluetooth device (i.e., smartphone) are turned on.
Check that the headset and the transmitting Bluetooth device are connected via Bluetooth A2DP.
Turn up the volume if it is too low.
Check that the connected device is playing back.
If you are connecting a computer to the headset, make sure the audio output setting of the computer is set for a
Bluetooth device.
Pair the headset and the Bluetooth device again.
Check that the headphone cable is connected firmly.
Related Topic
How to make a wireless connection to Bluetooth devices
Using the supplied headphone cable
Listening to music from a device via Bluetooth connection
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