Many people in the industry know that LED advertising displays have been used for a long time, and there will inevitably be some black screens, display screens, and advertising failures. Therefore, it is necessary for maintenance personnel to solve and avoid the causes and phenomena of these failures to facilitate troubleshooting solve. The following are the ideas and methods provided by the LED display manufacturer LCF LCF to solve this phenomenon. I hope that it can be helpful to all friends and friends:

1. LED advertising display screen is black

1. The power supply is abnormal, and the normal working voltage of the screen is 9-40V DC

2. When the power supply is normal, the screen will be blank, disassemble the LED advertising screen, and observe whether the indicator light of the control system is on. If the indicator light does not occur, please check the input and output voltage of the power supply with a multimeter. Normally, the output voltage of the power supply is 4.5. V to 5.5V.

3. If the output voltage of the power supply is normal and the indicator light of the control system does not light, it means the system is faulty. If only the system power indicator light is always on, the status indicator light is off (normally the system has the power indicator light always on, and the working indicator light flashes. ).

4. If the power indicator light is always on and the system indicator is flashing normally, it means that the control system hardware is normal. In this case, use the test software to check whether the system is set to "On time calibration" (if the system is set to light on time calibration. You need to reset the system) or re-upgrade the control card, and check whether the power supply of the cell board is normal (check whether the power supply of the cell board is soldered).

Second, the LED advertising display screen is garbled or displayed abnormally

1. The fuzziness of the LED advertising screen shows that it is a hardware failure of the unit board. Common failures include chip management false soldering (one column does not light up, one small piece does not light up), chip burnout (the second half does not light up), and lamp bead burnout (one row is often Bright or one can't wait)

2. If a column is not bright, please repair the corresponding chip management. If a small part is not bright, you need to replace the corresponding chip (column control chip 5020 or 74H595, row control chip 4575)

3. The LED advertising display screen is displayed normally, but the advertisement fails to be sent.

1. First check the communication line, whether the plug of the communication machine is off or unplugged, if so, please connect it back. (There are two connectors between the GPS and the display screen, one is connected to the GPS, and the other is the external communication line of the LED advertising display. (There is a joint at 50 cm)

2. If the connectors are all connected, try to unplug the communication connector at the display screen, check whether the copper plate of the connector is in poor contact or the copper plate has been inserted incorrectly, and then try to correct it. (In this case, the advertisement has been displayed, but the platform shows that it is sending, indicating that the LED feedback line is faulty. Please check whether the connector is properly connected).

3. If the connector at the display has been connected and the display communication is judged to be normal, please check whether the connector at the GPS is disconnected or whether the communication line from the display to the GPS is short-circuited, etc.

4. If it is judged that the display is a problem, disassemble the display and check whether the communication line of the system is off (it is rare to show off). If the communication line is connected normally, it is judged that the communication line chip (232) of the system is faulty, and this situation occurs. The communication chip needs to be replaced.

The above is the introduction of Lianchengfa on the cause and solution of the black screen of the full-color LED advertising display. I hope I can help you, starting from simple to complex, starting from the basics for troubleshooting, as long as you follow the above descriptions one by one to solve the problem. If it doesn't work, you can still request technical support.