What is the reason for the lack of color in the LED display? Output problems will lead to what phenomenon, specifically down to see

I. LED display missing color

LED display missing color is generally the cause of the data interface. 

1. Detect 245 of the color of the data side of the input and output.

2. Detect whether the data signal of the color is short-circuited to other lines. 

3. Detect the color of the driver IC between the cascade data port whether there is a broken or short-circuit, virtual welding.

Note: You can use the voltage detection method is easier to find the problem, test the data port voltage is different from normal, to determine the fault area.

II. LED display output problems

1. Detect whether the line from the output interface to the signal output IC is connected or short-circuited. 

2. Detect whether the clock latch signal of the output port is normal.

3. Detect whether the cascade output data port between the last driver IC is connected to the data port of the output interface or whether it is short-circuited.

4. Check whether the output signals are short-circuited to each other or short-circuited to ground.

5. Check whether the output wiring is good.