Follow these steps to troubleshoot the issue:
Check your Smart TV and Bluetooth device are compatible with one another.
If your Bluetooth devices have not been successfully connected, try resetting the Smart TV by turning it off and on again or through the TV’s dependent menus.
Verify that the Smart TV’s Wireless network is working properly.
Ensure that the Bluetooth devices are charged and in discoverable mode.
Intermittently press the CONNECt button on the device and try to pair the devices together.
Try to restart both the Bluetooth device and the Smart TV.
