1. Check that the power cord is plugged in securely and that the outlet works.

2. Check and confirm that the cable box is on and sending a signal.

3. Check the settings of the TV to confirm that the TV source/input is set to the connection type that is plugged in.

4. Make sure the TV is not set to power saver mode.

5. Reset the TV and check if the issue still exists.

6. Try connecting a different device to the TV.

7. If the issue continues, it is recommended to contact the manufacturer for further assistance.