If the LED display screen fails, it will definitely cause trouble to the industry. The trouble is to solve it, but how to solve it? In this article, I will share with you 10 ways to troubleshoot the LED display screen. 1. The display screen does not work and the green light of the sending card flickers. Causes of failure: 1) There is no power supply for the screen; 2) The network is not well connected; 3) The receiving card has no power supply or the power supply voltage is too low; 4) The sending card is broken; 5) Connection or malfunction of signal transmission intermediate equipment (e.g. function card, optical transceiver box); Troubleshooting methods: 1) Check and confirm that the power supply of the screen is normal; 2) Check the reconnection line; 3) Ensure that the DC output power supply is 5-5.2V; 4) Replace the sending card; 5) Check the connection or replace the function card (optical transceiver box); 2. The display screen does not work and the green light of the sending card does not flicker. Causes of failure: 1) DVI or HDMI lines are not connected properly; 2) The replication or expansion mode is not set in the graphics card control panel. 3) The software chooses to turn off the large screen power supply. 4) The sending card is not inserted in place or has problems with the sending card; Troubleshooting methods: 1) Check DVI connector; 2) Resetting the replication mode; 3) The software chooses to turn on large screen power supply; 4) replacing or replacing the sending card; 3. Prompt "Big Screen System Not Found" at Boot-up Causes of failure: 1) Serial or USB lines are not connected to the sending card; 2) The COM or USB port of the computer is broken; 3) Serial or USB cable is bad; 4) The sending card is broken; 5) No USB driver installed Troubleshooting methods: 1) Confirm and connect the serial line; 2) Replacement of computers; 3) Replacement of serial line; 4) Replace the sending card; 5) Install new software or separate USB driver 4. Long strips of the same height as lamp boards are not displayed or partly not shown or lacking in color. Causes of failure: 1) Flatline arrangement or DVI line (suitable for submarine series) is not well contacted or disconnected; 2) There is a problem with the output of the former or the input of the latter on the display lamp board at the junction. Troubleshooting methods: 1) Re-insert or replace the wiring arrangement; 2) Determine which display module is out of order and then replace and repair it. 5. Partial modules (3-6 blocks) are not displayed Causes of failure: 1) Power protection or damage; 2) AC power cord contact is not good Troubleshooting methods: 1) Inspection to confirm that the power supply is normal; 2) Reconnect the power cord 6. The whole box is not displayed. Causes of failure: 1) 220V power supply line is not connected properly; 2) There are problems in the transmission of network lines; 3) Damage of receiving card; 4) HUB board insertion dislocation Troubleshooting methods: 1) Inspection of power supply lines; 2) confirm the replacement of the network line; 3) Replacing the receiving card; 4) Reinsert HUB 7. Flower dots and pictures on the whole screen Causes of failure: 1) The driver loader is incorrect; 2) Computer and screen wires are too long or of poor quality; 3) Bad Send Card Troubleshooting methods: 1) Re-operation to load the receiving card file; 2) Shortening or replacing the length of the wire; 3) Replacement of sending cards 8. The same content is displayed in each display unit of the whole display screen. Causes of failure: No screen connection file was sent Troubleshooting methods: Reset the sending screen file and connect the computer's wire when sending it. Insert the sending card near the output port of the indicator lamp. 9. The brightness of the display screen is very low and the display image is blurred. Causes of failure: 1) Error in sending card program; 2) The function card is not set correctly Troubleshooting methods: 1) Restore the default settings of the sending card and save them. 2) Setting the minimum brightness value of the monitor screen to be above 80; 10. Shaking or reappearance of the whole screen Causes of failure: 1) Check the communication lines between the computer and the big screen; 2) Check the DVI line of multimedia card and sending card; 3) The sending card is broken. Troubleshooting methods: 1) Re-insert or replace the communication line; 2) Strengthen the DVI line by punching and inserting. 3) Replace the sending card. Knowing the common faults and emergency solutions of these ten LED displays, you don't have to worry too much about the temporary faults of the display screen, because you can completely solve them.