1. Make sure that all hardware, including the control system, is fully powered up. (Note: +5 V, do not reverse, then wrong)
2, check and confirm that the serial cable used to connect the controller is loose or off the phenomenon. (LED display manufacturers recommend: if the process of loading black, it is likely that because of this cause, that is, during the communication process due to loose communication line and interrupted, so the screen black. Do not think that the display body is not moving, the line It can not be loosened, please check it out, which is important for you to quickly solve the problem.
3, check and confirm the connection LED display and the main control card connected to the HUB distribution board is tightly connected, is inserted.
4, please check and confirm the connection between the letter control card and HUB distribution board between the 50-core cable is loose or plug the phenomenon.
5, if your display interface definition and provided HUB board does not match the black screen will appear, please re-check your jumper whether there is loosening, breaking or short circuit phenomenon. If you think that ABCD and other signals have been one by one correspondence, please check the OE signal is connected correctly. (LED display manufacturers strongly recommend using the display interface with the definition of matching HUB distribution board.