Follow these steps to troubleshoot a black screen on your Smart TV:

1. Unplug the power cord from the TV for 30 seconds and plug back in.
2. Ensure that the power source works properly by plugging and unplugging it a few times.
3. Check for audio/video cables and HDMI cables that may be loose or disconnected.
4. Ensure all other video display devices in the area are disconnected, such as gaming consoles, laptops, computers, and other Smart TVs.
5. Verify that the volume output of the TV is not too low.
6. If the television has an external box connected to it, ensure it is powered on.