Common fault detection methods for full-color LED displays
With its unique creativity and high-definition multi-angle visual experience, the full-color LED display has become a favorite display device for the majority of users. Sometimes the full-color LED display may malfunction due to improper use. Today I will tell you a few things. A common fault detection method. If you want to do well, you must first sharpen your tools. Therefore, to be able to safely repair the LED display, you must prepare common tools such as multimeters and screwdrivers, and repair them in the order of serious to slight, similar to short-circuit faults. Should be dealt with first. Short-circuit detection method: Use a multimeter to adjust to the short-circuit detection file. When a short-circuit fault is detected, give priority to processing to avoid damaging other devices. At the same time, pay attention to processing when the equipment is powered off. Voltage detection method: Use a multimeter to adjust to the voltage range, and test whether the voltage of the faulty circuit board is consistent with the voltage of the normal circuit board. Voltage drop detection method: Use a multimeter to adjust to the diode voltage drop detection gear. When there is a current through the pin, there will be a voltage drop. According to the voltage drop value, determine whether there is a fault. This method also needs to be tested when the device is powered off. , It is not recommended to use this method in the high-resistance device under test, because it cannot be detected. Resistance test method: Use a multimeter to adjust to the resistance file, and test whether the resistance of the faulty circuit board is consistent with the resistance of the normal circuit board. Why is the screen completely black on the full-color LED display? 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 as soon as it is powered on, or it may be black during the loading process, or it may be black after sending, etc.: 1. Please make sure that all hardware including the control system is complete 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 LED screen and the HUB distribution board connected to the main control card are tightly connected and whether they are plugged in reverse. Why does the full-color LED display have a bright line for a few seconds or the screen picture becomes blurred when it is first powered on? After the full-color LED display controller is properly connected to the computer and the HUB distribution board and the screen, it is necessary to provide 5V power to the controller to make it work normally (at this time, do not directly connect to the 220V voltage). At the moment of power-on, a bright line or 'fuzzy screen' will appear on the LED display for a few seconds. This bright line or 'fuzzy screen' is a normal test phenomenon and reminds the user that the LED display is about to start working normally. Within 2 seconds, the phenomenon will be automatically eliminated, and the screen will enter the normal working state. The above are several detections and solutions for the failure of the full-color LED display. When testing and repairing the LED display, the LED display device should be tested under the condition of ensuring safety, or contact a professional LED display. Maintenance staff. As a professional full-color LED display manufacturer, Huaze Optoelectronics has high-quality products and professional services, and insists on customizing advanced and scientific LED displays for users, which has won the love and trust of users. The main products are indoor full-color LED display, outdoor LED display, LED special-shaped screen, LED transparent screen, interactive induction LED floor tile screen and so on.