First, check that your streaming device and Smart TV are both connected to the same network.

1. Check that the correct input has been selected on your Smart TV.
2. Restart your streaming device and Smart TV.
3. Check the cables that connect the streaming device to your Smart TV are securely connected.
4. Make sure that the latest software versions are installed on both your streaming device and Smart TV.

If the issue persists, it may be necessary to get further assistance from the manufacturer of your streaming device or Smart TV.