1.LED display maintenance-unit board is not lit.
cause
When the led is powered on, it is found that the unit board is not lit. After inspection, it was found that there was no +5v, and the data cable was broken.
solution
If the power supply is broken, just replace it with a new one. If the data cable is damaged, it is ok to buy a matching data cable.
2.2. Maintenance of LED display screen-the whole screen is not bright
cause
After power-on, if the whole led does not light up, it should be that the main controller does not have+5V; The whole screen may have no alternating current; It is more likely that the computer settings are wrong.
solution
In view of the above problems, check them one by one. If the power supply is broken, replace it. If there is no alternating current, you need to check the power supply circuit with a multimeter; If there is something wrong with the settings, please readjust.
3.led display maintenance-the equipment is always on
cause
In this case, there should be a problem with the data cable connecting the unit or the corresponding switchboard. The probability of quick cell board failure is relatively small, but it needs to be checked.
solution
Plug in the data cable again first, pay attention to the direction and see the effect. If not, you can try to change a data cable. If not, then replace the switchboard, or simply replace the unit board, which will definitely solve the problem.
4.4. Maintenance of LED display screen-abnormal communication
cause
It is likely that the software settings are incorrect; Whether the communication line is connected; There is something wrong with MAX323.
solution
You can restart the computer and turn on the display again. For better maintenance, you can continue to check the settings. If there are problems, you can reset them. If it is still not repaired, you need to measure it with a digital meter and replace this MAX232.
5.5. Maintenance of LED display screen-the whole screen is lit up every few lines in the horizontal direction instead of every few lines.
cause
Basically, the network cable was not plugged properly, and it was accidentally touched during use, which led to the loosening of the connector.
solution
Reconnecting the network cable is not as difficult as above. Check whether the contact points are good. If it is rusty, it can be sanded.
6.6. Maintenance of LED display screen-the large screen display is normal and the computer is blank.
cause
The expected computer settings are incorrect.
solution
There must be something wrong with the computer. Reset it. If not, you can read the instructions.