1. Make sure that all hardware including the control system has been powered on correctly. (Note: +5V, do not connect reversely or wrongly)
2. Check and confirm whether the serial port cable used to connect to the controller is loose or falling off. (The LED Display manufacturer recommends: If it turns black during the loading process, it is probably caused by this reason, that is, the communication line is interrupted due to the loosening of the communication line, so the screen is black. Do not think that the display body is not moving, the line It is impossible to loosen, please check it by hand, this is very important for you to solve the problem quickly.)
4. Please check and confirm whether the 50-core cable connecting the Lingxin control card and the HUB distribution board is loose or inserted reversely.
5. If your display interface definition does not match the provided HUB board, a black screen will appear. Please recheck whether your jumper is loose, open or short. If you think that the ABCD and other signals have been one-to-one correspondence, please check whether the OE signal is connected correctly. (LED display manufacturers strongly recommend to use a HUB distribution board that matches the display interface definition)