As a large screen commonly used outdoors, full-color led displays are currently used in many events, such as dinners, wedding receptions, stage shows, square displays, etc. When the display is an important modern display device, the following maintenance A few small points for a simple maintenance analysis.
Indoor LED display, outdoor LED display, LED high-definition display, LED electronic display, LED hotel school mall display, LED cylindrical screen, LED creative screen, LED soft module screen, LED pillar screen, Maipu Glory LED all Color display
The first tools needed are multimeter, electric iron, blade, tweezers.
Judgment problems must be dealt with first and then second, with obvious and serious treatment first, and minor problems later. The short circuit should be ZUI high priority.
1 Observation method, observation method and visual observation of the screen, sometimes the circuit can be seen by the eye, such as the PCB circuit is scratched due to scratching, sometimes the electric drill accidentally breaks all!
2 Contrast method. Contrast method is very important and very important. Sometimes we ca n’t see if the IC is burnt out, we can replace it with a good IC. Sometimes we do n’t remember if the signal is the same, we can take a good cell board to measure What is the corresponding position! The comparison method is very important!
3 Removal method, sometimes there are many reasons for a fault, we can deal with them one by one, if you don't remember, you can take a look at the treatment of common faults in the front, and eliminate them one by one!
4. Resistance detection method, adjust the multimeter to the resistance range, check the resistance value of a normal circuit board to the ground point, and then check the same point of another same circuit board to test whether the normal resistance value is different, If they are different, the scope of the problem is determined.
5. Voltage detection method, adjust the multimeter to the voltage range, detect the voltage to ground at a certain point of the circuit in question, and compare whether it is similar to the normal value, otherwise determine the scope of the problem.
6. Short-circuit detection method, adjust the multimeter to the short-circuit detection block (some are diode voltage drop or resistance file, generally with alarm function), detect whether there is a short circuit phenomenon, should find priority after the short circuit is found, so that it does not burn Other devices. This method must be operated when the circuit is powered off to avoid damage to the watch.
7. The voltage drop detection method, adjust the multimeter to the diode voltage drop detection file, because all ICs are composed of many basic unit components, but they are only miniaturized, so when a current passes through one of its pins, There will be a voltage drop on the pin. Generally, the voltage drop on the same pin of the same type of IC is similar. According to the value of the voltage drop on the pin, it must be operated when the circuit is powered off. This method has certain limitations. For example, if the detected device is high resistance, it cannot be detected.
Maybe the methods are far more than these, but we are familiar with these methods and it is almost the same!
The maintenance can be summarized in three points:
Point 1: Short circuit
Many faults are actually caused by short circuits, we just need to deal with the short circuit!
Second point: open circuit
As the name implies, a broken circuit is a signal interruption. We just need to connect the signal interrupted line to it!
The third point: IC damage
There is nothing to say about IC damage, just use the above method to judge, it can be replaced by bad!
The simple maintenance of the LED display screen is also one of the advantages of the display screen. Whether it is a technician of the Maipu glossy display manufacturer or the maintenance personnel of the display screen, they should master these basic maintenance points and methods.
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