1. Please make sure that all hardware including the control system has been powered on correctly. Note: +5V, do not connect it in reverse or wrongly.

2. Check and confirm again and again whether the serial cable used to connect the controller is loose or falls off. The manufacturer of the LED display screen suggests that if it turns black during the loading process, it is likely to be caused by this reason, that is, the screen is black due to the interruption of the communication line during the communication process. Don't think that if the display body is not moving, the cable can't be loose, please check it by hand, it is very important for you to solve the problem quickly.

3. Check and confirm whether the LED display screen and the HUB distribution board connected to the main control card are tightly connected or not inserted backwards.

4. Please check and confirm whether the 50-core cable between the control card and the HUB distribution board is loose or inserted backwards.

5. If your LED display interface definition does not match the provided HUB board, a black screen will also appear, please re-check your jumper for looseness, open circuit or short circuit. If you think that ABCD and other signals have been corresponded one by one, please check again whether the OE signal is connected correctly. Reminder: LED display manufacturers strongly recommend to use a HUB distribution board that matches the definition of the display interface.

If you master the above methods, you will be able to handle the "failure" of the black screen of the LED display that you usually encounter. I believe that your company will properly handle the problems reported by customers. Business will naturally prosper. Xiaobian shares the above experience with you, hoping to help you solve the problem.