1. The instantaneous power is black
2. Black in the process of document loading
3. Black after the file is sent
The process of darkened screens can vary depending on the operation or the environment.
Solution:
1. Please ensure that all hardware including the control system is properly on the power. (V, do not answer, connect wrong)
2, check and repeatedly confirm the serial line used to connect the controller is loose or off phenomenon. (If it turns black during loading, probably because of this reason, that is, in the communication process due to loose communication lines and interrupted, so the screen black, do not think that the screen is not moving, the line will not be loose, please check it, this is very important to quickly solve the problem. ）
3, check and confirm the connection between the LED screen and the main control card connected to the hub distribution board is closely connected, whether the plug.
