1. Sudden increase in power supply voltage.There are many reasons for the sudden increase of the power supply voltage.For example,the quality of the power supply,or improper use by the user,etc.may cause the power supply voltage to suddenly increase.

2. The short circuit of a component or printed line or other wire in the circuit forms a local short circuit of the power supply path of the LED display screen,which increases the voltage at here.

3. A certain LED display screen is short-circuited due to its own quality damage, and its original voltage drop will transferred to other LED displays.

4. The temperature inside the box is too high,which makes the characteristics of the LED display deteriorate.

5. The anti-static work was not done well during assembly,so that the inside of the LED display has been damaged by static electricity.Although the normal voltage and current values are applied,it is extremely easy to cause damage to the LED display.