The system detects the LED display is crucial. With the right approach can be found in the system detects a potential problem. Common system detects a short circuit detection method, resistance detection method, voltage detection method, the pressure drop detection method of these four methods.
LED display system detects the four methods
1, the short-circuit detection method, the multimeter transferred to short-circuit detection block (usually with alarm functions, such as lead General Beep Cry) to detect whether there is a short circuit phenomenon thrown up, found after a short circuit should be immediately resolved, a short circuit is the most common led display module failure. Some through observation and IC pin pin pin can be found. Short detection circuit should operate without power, to avoid damage to the multimeter. This method is the most commonly used method, simple and efficient. 90% of the faults can be detected by means of this method is determined.
2, the resistance detection method, the multimeter transferred resistance profile, detecting a normal circuit board to a point of resistance to ground, and then another piece of the same test circuit board test points of unity with the normal resistance value is different, If different, then to determine the scope of the topic.
3, the voltage detection method, transferred to the multimeter voltage profile, topic detection circuit is suspected of a point to ground voltage, the comparator is similar with normal, can facilitate the determination of the scope of the topic.
4, the voltage drop detection method, transferred to the multimeter diode drop test file, because all of the IC are many single element from the basic composition, but small, so when it has a pin power flow smoothly expired , will be in the presence of voltage on pin drop. General unified model of the IC pin drop on the same similarity, according to the pin drop on the value comparison is good or bad, to be in the circuit case of power failure manipulation.
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