The faults that often occur in car LED advertising screens include black screens, display screens, and failed advertisement transmissions. Therefore, it is necessary for maintenance personnel to understand what causes such a phenomenon and facilitate troubleshooting.
First, the car LED advertising screen bus led display is black screen
1, the power supply is not normal, the screen normal working voltage is DC 9-40V
2. When the power supply is normal, the black screen is opened, and the display screen is preliminarily observed. If the indicator light of the control system is light, if the indicator light does not appear, please check the input and output voltage of the power supply with a multimeter. Under normal circumstances, the power output voltage is 4.5V. To 5.5V.
3. If the output voltage of the power supply is normal, the indicator of the control system is off, indicating that the system is faulty. If only the system power indicator is steady on, the status indicator is off. (Normally, the system has a power indicator that is always on, and the work indicator is blinking. ).
4. If the power indicator is always on, and the system indicator is also flashing normally, the hardware of the control system is normal. In this case, use the test software to check whether the system is set to “lighting when the system is on” (if the system is set to light) Screen, you need to reset the system) or re-upgrade the control card, and check whether the unit board is powered normally (check the unit board unit board power supply for solder joints).
Second, the car LED advertising screen bus led display is truddy or display abnormal
1, the car LED screen flower screen description is the unit board hardware failure, common faults have chip tube teaching virtual welding (one column is not bright, a small piece is not bright), the chip is burnt out (the latter part is not bright), the lamp bead burned (a list of often Bright or one does not light up)
2, if a column is not bright, please repair the corresponding chip management, a small part does not shine, you need to replace the corresponding chip (column control chip 5020 or 74H595, row control chip 4953)
Third, the car LED advertising screen bus led display is displaying normal, but the ad failed to send
1. First check the communication line, whether the communication plug is disconnected or unplugged, if you please pick it up, (GPS to the display has two connectors, one is connected to the GPS, and the other is the led display external communication line 50 There is a joint at the cent branch)
3. If the connectors are already connected, try to unplug the communication connector at the display to check if the connector copper is not in contact or the copper is inserted. If you try to correct it. (In this case, the advertisement has been displayed, but the platform display is being sent, indicating that the LED feedback line (TXD) is faulty, please check if the connector is docked).
4. If the connector at the display is connected and the display communication is normal, please check if the connector at the GPS is disconnected or the communication line from the display to the GPS is short-circuited.
5. If it is judged to be a display problem, open the display and check if the communication line of the system is disconnected (the dropout display is relatively rare). If the communication line is connected normally, it is determined that the communication line chip (232) of the system is faulty. Need to replace the communication chip.
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