Four common LED display maintenance detection methods

186 views admin 2023-11-02

LED display has environmental protection, high brightness, high clarity, high reliability and other characteristics, with the progress of science and technology, LED display has been widely used, the following introduces the commonly used LED electronic display maintenance detection methods, I hope to help you.

The multimeter is adjusted to the short-circuit detection block (generally has an alarm function, such as the conduction of the buzzer), detect whether there is a short circuit phenomenon, found after the short circuit should be solved immediately, short circuit phenomenon is also the most common LED display module fault. Some can be found by observing the IC pins and row pins. Perform short-circuit detection when the circuit is powered off to avoid damage to the multimeter. This method is the most commonly used method, simple and efficient. 90% of faults can be detected by this method.

Set the multimeter to the resistance level, test the ground resistance value at a certain point of a normal circuit board, and then test the same point of another identical circuit board to test whether the resistance value is different from the normal value, if it is different, it determines the scope of the problem.

Set the multimeter to voltage gear, detect the voltage to ground at 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.

Set the multimeter to the diode voltage drop detection, because all ics are composed of basic many units, but miniaturized, so when it has a current through one of the pins, there will be a voltage drop on the pin. Generally, the pressure drop on the same pin of the same type of IC is similar, and according to the pressure drop value on the pin, it must be operated in the case of circuit power failure.