Reason for LED display screen not lit up.P2 soft LED module

　　1. Data cable issue: The network cable is loose or detached, causing the entire screen to not light up.

　　2. Screen power supply issue: A problem with the entire screen power supply causes all lights to not turn on. A problem with the 5V power supply that supplies power to the first receiving card can cause the receiving card to not function properly and also cause the entire screen to not turn on;

　　3. Receiving card issue: The first receiving card connected to the sending card has a problem, which may cause the entire LED display screen to not light up;

　　4. Graphics card issue: The graphics card is damaged or the interface is loose, resulting in data being unable to be collected; Bad graphics card causing data collection and transmission failure;

　　5. Sending card issue: The sending card is damaged, resulting in data not being accepted or sent;

　　6. Computer software issues: This problem can occur when the computer LED control software is reset, or when the computer firewall restricts the use of the control software.

　　The main reasons why some modules in LED electronic displays do not light up are:

　　1. Check if the power connection cable, 26P flat cable between unit boards, and power module indicator light are normal.

　　2. Use a multimeter to measure whether the unit board has normal voltage, and then measure whether the voltage output of the power module is normal. If not, it is judged that the power module is faulty.

　　3. Measure the low voltage of the power module, adjust the fine adjustment (near the indicator light of the power module) to make the voltage reach the standard.

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