Hey! Deactivate screensaver if not done yet. That may be a cause. How do you controll the display? Are you using a command like /opt/vc/nin/tvservice -o and /opt/vc/nin/tvservice -p or just tvservice -o? And is the display connected via hdmi? If that’s the case you could try the following: In /boot/config.txt add hdmi_blanking=1 and reboot. Now try HDMI Output OFF with vcgencmd display_power 0 and HDMI Output ON with vcgencmd display_power 1 instead of the command above. Descript here. :)