1. There is a problem with connecting cable
Connecting the control card and the module cable loosening, damage are likely to occur such problems. It is recommended to re-plug the cable to observe the problem can not be resolved.
2. The module is damaged
Module short circuit, module chip problems. The LED display signal is an input signal from the output pin of a cell board to another board, so if there is a problem with a board, it will cause the entire row behind it to be off or off. So when the LED display a row of problems, we should put this row of the beginning of the board is not normal replacement, or with a long cable to jump directly to the board, look at the back of the board is normal The
3. Control card problem
Control card data transmission error, but this situation is relatively rare. If the light is not bright, then check whether there is 5V voltage power supply, LED display can display the content, if you can display the contents of the control card shows the contents of the function is good; if the power supply is open, look at the control card light is lit; And then use the control card software to find out about the control card, if you can find the words, then the control card to send the contents of the function is good; if not find, then check the communication line is not connected, if connected, There may be a problem. As long as these two functions are good, the control card is good, otherwise it is necessary to replace the control card.