With the popularization and application of LED displays and LED full-color screens, LED displays have become a beautiful landscape in today's information society. Especially when night falls, LED displays bloom with bright pictures that allow people to feel the world. Colorful. However, as the application range of LED displays continues to expand, LED displays are experiencing more and more fault problems. So how to test LED display faults?

1. Resistance detection method, adjust the multimeter to the resistance range, detect the resistance value to ground at a certain point on a normal circuit board, and then detect the same point on another identical circuit board to see if there is any difference from the normal resistance value. If they are different, the scope of the problem is determined.

2. Voltage detection method, adjust the multimeter to the voltage range, detect the voltage to ground at a certain point of the suspected circuit, and compare whether it is similar to the normal value. Otherwise, the scope of the problem is determined.

3. Short circuit detection method, adjust the multimeter to the short circuit detection level (some are diode voltage drop level or resistance level, generally with alarm function), detect whether there is a short circuit, and solve it first if the short circuit is found to prevent it from burning out. Other devices. This method must be operated with the circuit powered off to avoid damaging the meter.

4. Voltage drop detection method, adjust the multimeter to the diode voltage drop detection range. Because all ICs are composed of many basic single components, they are just miniaturized, so when there is current passing through one of its pins, There will be a voltage drop on the pin. Generally, the voltage drops on the same pins of ICs of the same model are similar. The voltage drop value on the pins is better or worse, and the circuit must be operated with the power off. This method has certain limitations. For example, if the device to be detected is high-resistance, it cannot be detected.

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