How to solve the problem that the whole LED display screen is not bright?led advertising display screen

　　With the continuous progress of science and technology, now seamless and high-quality led display has become the ultimate pursuit. Although the technology of LED display screen is very mature now, there are always some faults in the process of use. The following will mainly introduce the common faults and solutions of LED display screen:

　　1、 Why does the LED display screen appear a few seconds of bright line or the screen picture becomes blurred when it is just powered on?

　　After the screen controller is properly connected with the computer and HUB distribution board and screen, it is necessary to provide+5V power supply to the controller to make it work normally (at this time, do not directly connect with 220V voltage). At the moment of power-on, there will be a few seconds of bright line or "splash screen" on the screen. The bright line or "splash screen" is a normal test phenomenon, reminding the user that the screen is about to start normal operation. Within 2 seconds, this phenomenon will be eliminated automatically and the screen will enter into normal working state.

　　2、 What is the reason for failing to load or communicate?

　　The reasons for communication failure and loading failure are roughly the same, which may be caused by the following reasons. Please compare the listed items with the operation:

　　1. Make sure that the hardware of the led display control system is properly powered on.

　　2. Check and confirm that the serial port line used to connect the controller is a straight line, not a cross line.

　　3. Check and confirm that the serial port connecting wire is intact and there is no looseness or falling off at both ends.

　　4. Select the correct product model, the correct transmission mode, the correct serial port number, and the correct serial transmission rate by comparing the LED display control software and the control card selected by yourself, and correctly set the address bit and serial transmission rate on the control system hardware by referring to the dial switch diagram provided in the software.

　　5. Check whether the jumper cap is loose or falling off; If the jumper cap is not loose, make sure the direction of the jumper cap is correct.

　　6. If it still fails to load after the above inspection and correction, please use a multimeter to measure whether the serial port of the connected computer or control system hardware is damaged to confirm whether it should be returned to the computer manufacturer or the control system hardware for testing.

　　3、 The reason why the whole screen of the unit board is not bright or dark

　　1. Visually check whether the power cable, 26P flat cable between the led display unit board and the power module indicator 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, the power module is broken.

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

　　4、 What is the reason why the LED screen is completely black?

　　In the process of using the control system, we occasionally encounter the phenomenon that the led screen is completely black. The same phenomenon may be caused by various reasons. Even the process of screen blackening will vary according to different operations or different environments. For example, it may turn black at the moment of power-on, or it may turn black during loading, or it may turn black after sending, and so on:

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