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Brief description of the screen LED system testing 4 ways

Author:admin Time:2017-06-30

Now, the European Union introduces 4 methods to check with a multimeter, such as short circuit detection, resistance detection, voltage detection and pressure drop detection, these 4 methods.
7 inches up and down alignment FOG
7寸上下对位FOG
The picture shows the 7 inch upper and lower alignment FOG in the Europa League (one of the devices for the production of the screen LED)
4 ways of detecting LED on display screen
Resistance detection method: detection of a point of a normal circuit board to ground resistance value, and a unified detection point to another piece of the same circuit board test and normal resistance values are different, if different from the range of topics. (adjust the multimeter to the resistor before testing)
Short circuit test: check whether there is a short-circuit phenomenon, and found that after the short circuit should be resolved immediately, short-circuit phenomenon is also the most common LED display module failure. Some by observing the IC pin and pin pin can be found. Short circuit test should be operated when the circuit is out of power, so as to avoid damaging 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. (the multimeter to block the short-circuit detection before detection (usually with alarm function, such as the guide for a Ming cry))
Pressure drop test: since all IC is made up of many basic single components, it is only miniaturized, so there is a voltage drop on the pin when the current is smooth and expired on one of its pins. The pressure drop on the same pin of the same model IC is similar. According to the value of the pressure drop on the pin, it must be operated when the circuit is out of power. (before testing, adjust the meter to the diode pressure drop detector)
Voltage detection: detecting the voltage to a certain point of a circuit suspected of having a problem, and comparing whether it is similar to the normal value, it is convenient to determine the scope of the subject. (before testing, switch the multimeter to the voltage file)
The use of a multimeter prevents potential underlying problems in most displays, and in general is very simple and practical.

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