| Fault | Reason | Solution |
| Whole screen no display | a. No AC power supply. | Check main power cable and reconnect it. |
| b. The computer isn't working | Check the computer | |
| c. Main data cable is broken. | Reconnect the main data cable correctly or change a new one. | |
| d. Control system is broken. | Check indicators on sending card and receiving card, if red one keep lighting while green one blinking when the system is ok, otherwise use spare parts to replace. | |
| e. Receiving card is no power. | Check power cable between receiving card and power supply | |
| f. Software setting is wrong. | Correct the software setting to suit the control system. | |
| Whole screen blinking. | a. Ground wire is broken. | Connect the ground wire between the computer and screen. |
| b. Control system is broken down. | Change the control system. | |
| c. Some signal of the data cable is lost. | Examine the data cable, reconnect it correctly or change a new one. | |
| d. Refresh rate setting is wrong | Correct the Refresh rate setting | |
| Module not work | a. Unit module has no power supply | Voltage for unit module is 5V. |
| b. Flat cable between two modules is cut off. | Change the flat cable. | |
| c. 245 IC is broke down. | Change new 245 IC | |
| part of module works abnormally | Signal of the part is wrong. | Check the resistance near the 5026 IC which control that area. |
| Rows of module are not lighting | Corresponding 4953 or 245 IC is not working. | Examine the corresponding 4953 or 245 IC |
| Columns of module are not lighting | Corresponding 5026 IC is not working | Examine 5026IC or change a new one. |
| Dots out of control | Pins or 5026 IC short connected | Re-soldering the 5026IC or change a new one. |
| The display texts have shadows. | Data cable or DVI cable connected incorrectly | Reconnect main data cable or DVI cable between graphic card and sending card |