Four ways to teach you to test the fault of LED display
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With the LED electronic display and LED full color popular application, led display has become a contemporary information society to a beautiful landscape, especially in the night comes, led display blooming bright picture so that people can feel the world The colorful colorful. However, with the application of LED display continues to expand, led display failure problems are more and more, then in the end how to test out the led display failure problem? The following led by the manufacturers for a brief introduction.
1, the resistance test method, the multimeter transferred to the resistance file, a normal circuit board to detect a point to the ground resistance value, and then detect another piece of the same circuit board with the same point of the same test resistance is different, If different, to determine the scope of the problem.
2, the voltage detection method, the multimeter transferred to the voltage file, the detection of suspected circuit of a point to the ground voltage, compared with the normal value is similar, otherwise determine the scope of the problem.
3, short-circuit detection method, the multimeter transferred to the short-circuit detection block (some diode downshift or resistance file, generally with alarm function), to detect whether there is a short circuit phenomenon, found short after the priority should be resolved, so that Other devices. The method must be operated in the case of circuit power failure to avoid damage to the table.
4, the pressure drop detection method, the multimeter transferred to the diode voltage drop detection file, because all the IC is composed of a large number of single components, but miniaturization, so when it has a pin on the current through, There will be a voltage drop on the pin. Generally the same type of IC on the same pin on the voltage drop is similar, according to the pin on the pressure drop value is good or bad, must be the case of circuit power failure operation. The method has some limitations, such as the detection device is high impedance, it can not be detected