Check your connections:

1. Ensure the power cable is plugged in.
2. Make sure you have the correct cables between the device and the TV.
3. Check that all cords are securely connected.

Update settings:

1. Go into the TV and input settings.
2. Verify that the video output settings are correct.
3. Ensure that the TV is set to the right input.

Perform a power cycle:

1. Power off all devices (TV, device, cable box, etc.) for a few seconds
2. Power each device on again one-by-one.

Check your device:

1. Confirm that the device is powered on and working.
2. Make sure your device is connected to the same wi-fi network as your TV.
3. Ensure that the device output cable is firmly connected.