LED display screen can be found everywhere. The teacher of LED display screen will teach you four tips to quickly repair and detect and solve the problems of LED display screen;
Short circuit detection method:
Set the multimeter to the short-circuit detection gear (generally with alarm function, if it is connected, it will sound), detect whether there is a short-circuit condition, and deal with it immediately after seeing the short-circuit condition. The short-circuit condition is the most common fault of LED display module. Some carefully observe the IC pin and pin, we can see that the short circuit detection should be operated when the circuit is turned off to prevent damaging the multimeter.
This method is the most common method, simple, efficient, 90% of the common faults can be detected by this method.
Resistance detection method:
Adjust the multimeter to the resistance gear, detect the resistance to ground of a normal circuit board at a certain point, and then detect the same point of another same circuit board to see if the detection is different from the normal resistance. If not, the scope of the problem will be clear.
Voltage detection method:
Adjust the multimeter to the voltage level to detect the voltage to ground at a certain point of the circuit which is suspected to be not very good, and compare whether it is similar to the standard value, so as to easily determine the scope of the problem.
Pressure drop detection method:
When the multimeter is set to the diode voltage drop detection level, because all ICs are made up of many basic modules, they are only miniaturized. Therefore, when the current passes through one of its pins, there will be current on the pin.
Generally, the voltage drop on the same pin of the IC of the same model and specification is similar. According to the voltage drop value on the pin, the IC must be operated when the circuit is powered off.