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The Detection Method Of LED Display

- Jan 08, 2021 -

Resistance detection method, the multimeter is adjusted to the resistance file, to detect a normal circuit board of a certain point to the ground resistance value, and then detect another piece of the same circuit board of the same point test and the normal resistance value is different, if different, to determine the scope of the problem.


Voltage detection method, the multimeter to the voltage range, detect the suspected problem of a certain point of the circuit voltage to ground, compare whether similar to the normal value, otherwise determine the scope of the problem.


Short circuit detection method, the multimeter to short circuit detection gear (some diode voltage drop gear or resistance gear, generally with alarm function), detect whether there is a short circuit phenomenon, short circuit should be found after priority to solve, so that it does not burn out other devices. This method must be operated in the case of circuit failure to avoid damage to the meter.


The voltage drop detection method, the multimeter to the diode voltage drop detection, because all ICs are composed of a number of basic units, just miniaturized, so when the current on one of its pins, there will be a voltage drop on the pin. Generally the same type of IC the same pin on the pressure drop is similar, according to the pin on the pressure drop value is good or bad, must be operated in the case of circuit power. This method has some limitations, such as the device being tested is high resistance, it can not be detected.