How to solve the problem that the whole LED display screen is not bright? _led large screen|led display control system|led display unit board

With the continuous advancement of science and technology, seamless and high image quality have now become the ultimate pursuit of LED displays. Although the LED display technology is very mature nowadays, there will always be some faults in the process of use. The following will mainly introduce the common faults and solutions of the LED display: 1. The LED display will appear for a few seconds when it is powered on. The reason for the bright line or the screen picture changing? After the screen controller is properly connected to the computer and the HUB distribution board and the screen, you need to provide +5V power to the controller to make it work normally (at this time, do not directly connect the 220V voltage connect). At the moment of power-on, a bright line or 'fuzzy screen' will appear on the screen for a few seconds. This bright line or 'fuzzy screen' is a normal test phenomenon and reminds the user that the screen is about to start working normally. Within 2 seconds, the phenomenon will be automatically eliminated, and the screen will enter the normal working state. 2. What are the reasons for the failure to load or the communication failure? The reasons for communication failure and loading failure are roughly the same. It may be caused by the following reasons. Please check the listed items and operations: 1. Make sure that the LED display control system hardware has been powered on correctly. 2. Check and confirm that the serial cable used to connect to the controller is a straight-through cable, not a crossover cable. 3. Check and confirm that the serial port cable is intact and there is no looseness or fall off at both ends. 4. Select the correct product model, correct transmission method, correct serial port number, correct serial transmission rate according to the LED display control software and the control card you choose, and set it correctly according to the DIP switch diagram provided in the software Control the address bits and serial transmission rate on the system hardware. 5. Check whether the jumper cap is loose or falling off; if the jumper cap is not loose, please make sure that the direction of the jumper cap is correct. 6. If it still fails to load after the above inspection and calibration, 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 The body is returned for testing. 3. The reason why the whole screen is not bright or dark on the unit board 1. Visually check whether the power connection line, the 26P cable between the led display unit boards 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, it is judged that the power module is broken. 3. Measure the low voltage of the power module and adjust the fine adjustment (the fine adjustment of the power module near the indicator light) to make the voltage reach the standard. Fourth, what is the reason why the LED screen appears completely black? In the process of using the control system, we occasionally encounter the phenomenon that the LED screen appears completely black. The same phenomenon may be caused by a variety of different reasons, even the process of turning the screen black will vary with different operations or different environments. For example, it may be black the moment it is powered on, or it may turn black during the loading process, or it may turn black after sending, etc.: 1. Please make sure that all the hardware including the control system are all Power on correctly. (+5V, do not connect reversely or wrongly) 2. Check and double-check whether the serial port cable used to connect to the controller is loose or falling off. (If it turns black during the loading process, it is probably caused by this reason, that is, the communication line is interrupted due to the loosening of the communication line during the communication process, so the screen becomes black. Please check it by hand, it is very important to solve the problem quickly.) 3. Check and confirm whether the large LED screen and the HUB distribution board connected to the main control card are tightly connected and whether it is plugged in reverse.