If your TV displays a 'No Signal' error when connecting your PS4:
1. Ensure all cables are securely connected to the TV and PS4.
2. Confirm the TV is set to the correct input source.
3. Try using a different HDMI cable or port on the TV.
4. Test the PS4 on another TV to determine if the issue is with the console or the TV.
5. If it's a persistent problem, consult a professional technician for further diagnosis.