If you’re able to turn your TV on, but the screen is black, you can try troubleshooting the problem. For example, you can:
Unplug the TV.
Assess the TV’s backlight.
Turn the power off and back on.
Check all of the connections, cables and cords (like the HDMI cable).
If you can’t fix the TV on your own, hire a technician to examine and repair it.