how can you do when your camera doesn’t show any video, it’s just a blank black
1. If your camera model is TT520PW, TT521PW, TT522PW. Please make sure the connection correctly. The lens unit must be plugged into “CAM” port on the base unit. Not “LAN” port.
2. If you ensure the connection is correct, please take a try that plug/unlug the connector of cable several times.
3,Please try to reset the camera by keeping pressing the RESET button about 10 second till the indicated light flash. Then waiting about 10 seconds and power off and power on it again. Please follow the quick guide to take a try to setup the initialized settings.
Hope the above information is helpful for you.