Here are a few steps that may help you to resolve your issue:

1. Check that your Smart TV is connected to the internet. This is necessary for it to properly communicate with your external devices.


2. Ensure that your Smart TV is set to accept audio and video from the connected device.


3. Confirm that the cables connecting your Smart TV and the external device are properly connected.


4. Enable Smart TV to automatically search for software updates or verify manual install.