Check if the power to the camera and monitor is ON first and check the voltage and the polarity. Check if the video-out terminal of the camera and the video-in terminal of the monitor are correctly connected. Check if the iris of the lens is open.
Check the voltage and the polarity of the power to the camera. If there is no problem with the power, immediately turn the power off and contact our A/S center. Check if the backlight interception is OFF.