1. Judge Whether The Control Card Is Good Or Bad
Turn on the power first and check whether the indicator light of the control card is on; if it is not, check whether there is 5V power supply and whether the LED electronic screen can display the content. If it can display the content, it means that the control card display content function is good. ; Then use the control card software to find the control card. If it can be found, it means that the function of the control card sending content is good; if it can’t be found, check whether the communication line is connected. If it is connected, then It is likely that there is a problem with the card. As long as these two functions are good, the LED control card is good, otherwise the control card must be replaced.
2. Judge The Power Supply Is Good Or Bad
If the power supply is broken, it will directly cause several boards to be off or abnormal at the same time, because one power supply controls several boards at the same time. If the LED electronic screen does not display or displays abnormally on several boards in the same small area, you should consider whether the power supply is broken. The direct detection method is to take the DC voltage of the instrument and measure whether the output voltage is between 4.9V and 5.5V. If it is not within this range, consider replacing the power supply.
3. Judge Whether The LED Unit Board Is Good Or Bad
The LED Display signal is transmitted from the output pin of one unit board to the input signal of another board, so if one board has a problem, it will cause the entire row behind it to be dark or abnormal. Therefore, when there is a problem with a row of LED electronic screens, we should replace the abnormal board in this row, or use a long cable to jump over this board directly, and then see if the back board displays normal .