Shenzhen Lianchengfa Technology Co., Ltd.

The detection methods of LED display maintenance include short circuit detection method, resistance detection method, voltage detection method, and voltage drop detection method.

1. Short-circuit detection method, adjust the multimeter to the short-circuit detection block (generally with an alarm function, if it is turned on, it will make a beeping sound) to detect whether there is a short-circuit phenomenon, and it should be solved immediately after a short-circuit is found. The short-circuit phenomenon is also the most common LED Display module failure. Some can be found by observing IC pins and pin header pins. Short circuit detection should be performed with the circuit de-energized to avoid damage to the multimeter. This method is the most commonly used method, simple and efficient. 90% of the faults can be detected and judged by this method.

2. Resistance detection method, adjust the multimeter to the resistance gear, detect the resistance value of a certain point of a normal circuit board to ground, and then test the same point of another same circuit board to test whether the resistance value is different from the normal resistance value. If not, the scope of the problem is determined.

3. Voltage detection method, adjust the multimeter to the voltage level, detect the ground voltage of a certain point of the circuit suspected of having a problem, and compare whether it is similar to the normal value, which can easily determine the scope of the problem.

4. The voltage drop detection method, adjust the multimeter to the diode voltage drop detection gear, because all ICs are composed of many basic single components, but they are miniaturized, so when there is current passing through one of its pins, There will be a voltage drop across the pin. Generally, the voltage drop on the same pin of the same type of IC is similar. According to the comparison of the voltage drop value on the pin, it must be operated when the circuit is powered off.