1. Check if the keyboard or mouse is on and connected (via USB, Bluetooth, etc).
2. Check if the TV is connected to the same Wi-Fi network as the device.
3. Try restarting both the device and TV.
4. Clear any temporary caches or data from the device.
5. Verify that the device and TV operate on the same frequency.
6. If possible, try connecting a different keyboard or mouse to the TV.
7. Update the firmware on the TV.
8. Uninstall and reinstall the app from the TV.
9. If the problem continues, contact your TV’s customer support for more help.