The camera is damaged or blocked. If the camera is damaged, the image can't be uploaded to the computer, so naturally it can't be displayed. In this case, you need to go to a repair shop or a 4s shop for repair, and you can replace a new camera if necessary. If there is only a foreign object blocking the camera, take it away.

The display screen is damaged. When the display screen is always black and can't be started or there is something wrong with the screen, it is generally broken. In this case, you should go to a repair shop or a 4s shop for inspection and maintenance.

Precautions for reversing

First of all, it is difficult to judge the distance between the vehicle and the vehicle or obstacle behind it, which requires more practice, observation and experience. Old drivers can usually reverse their cars by looking in the rearview mirror. Novices suggest not only looking at the rearview mirror, but also turning to look out through the rear window glass, with the rearview mirror as an aid.

Because only looking at the rearview mirror will have a bigger blind spot, and the distance from the rear car is not easy to grasp. In the process of reversing, if you are not sure how far the rear of the car is, you can get off and observe. After more observation, you will have a more accurate grasp of the distance in the car.