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How should the led electronic display screen not light up? How to self-check to find problems?

1. Check that the power supply is powered on. led display，Check whether the communication line is connected properly. (Sync screen)

2. The synchronization screen detects whether the green light of the communication between the sending card and the receiving card is flashing.

3. Whether the computer monitor is protected, or the display area is black or pure blue. (Sync screen)

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