As a large screen commonly used outdoors at present, full-color LED display screens are used in many activities, such as dinner parties, wedding banquets, stage shows, square display screens, etc. as the most important modern display equipment, the following is a simple maintenance analysis of several maintenance points. The first tools we need are multimeter, electric soldering iron, blade and tweezers. To judge the problem, we must deal with it in a primary and secondary way first, deal with obvious and serious problems first, and deal with small problems later. Short circuit shall be the highest priority.

1 observation method, observation method and screen naked eye observation, sometimes the open circuit can be seen by eyes, such as the PCB circuit is broken due to scratch, sometimes the electric drill accidentally breaks it!

2 comparison method. The comparison method is very important and critical. Sometimes we can't see whether the IC is burnt out with the naked eye. We can replace it with a good IC. Sometimes we don't remember whether the signal is connected originally. We can take the unit board and measure the corresponding position! Comparison is the key!

3. Troubleshooting. Sometimes there are many reasons for a fault. We can deal with it one by one. If we don't remember it, we can look at the treatment of common faults in front and eliminate them one by one!

4. Resistance detection method: adjust the multimeter to the resistance gear, detect the resistance to ground at a certain point of a normal circuit board, and then detect the same point of another same circuit board to test whether the resistance value is different from the normal resistance value. If it is different, the scope of the problem is determined.

5. Voltage detection method, adjust the multimeter to the voltage level, detect the ground voltage at a point of the suspected circuit, and compare whether it is similar to the normal value, otherwise the range of the problem is determined.

6. Short circuit detection method: adjust the multimeter to the short circuit detection gear (some are diode voltage drop gear or resistance gear, which generally has the alarm function) to detect whether there is a short circuit. If a short circuit is found, it should be solved first, so that it does not burn other devices. This method must be operated when the circuit is powered off to avoid damaging the meter.

7. Voltage drop detection method: adjust the multimeter to the diode voltage drop detection gear, because all ICs are composed of many basic single components, which are only miniaturized, so when there is current passing through a pin, there will be a voltage drop on the pin. Generally, the voltage drop on the same pin of an IC of the same model is similar. According to the voltage drop value 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 there are more than these methods, but we are familiar with these methods!

Other maintenance can be summarized as follows:

First point: short circuit

Many faults are actually caused by short circuit. We just need to deal with the short circuit!

Second point: open circuit

As the name suggests, open circuit is signal interruption. We just need to connect the line with signal interruption!

Third point: IC damage

There is nothing to say about IC damage. Just use the above method to judge. If it is bad, just replace it! The simple maintenance of LED display screen is also one of the advantages of the display screen. Both the technicians of the display screen manufacturer and the maintenance personnel of the display screen should master these basic maintenance points and methods.