Publisher: Supplier of LED Display Time: 2017-07-27 Views: 1459
The development of LED display technology is becoming more and more mature, and with the continuous development of the market economy, its application fields are becoming more and more extensive. When we walk in commercial streets, cultural squares, and sports venues, we can see all kinds of LED displays everywhere. The application of LED display is becoming more and more extensive, which not only brightens the scenery of the city, but also brings convenience to the people's life.
In addition to outdoor applications, full-color LED displays are also widely used indoors. Such as high-end conferences, exhibitions, radio and television, wedding hosting, stage performances, high-speed railway stations, airports and other scenes will be applied to LED display.
Obviously, the LED display has become one of the most important display devices in modern times, and plays a very important role in the display field. When the full-color LED display fails, what should we do? Lianchengfa Xiaobian shares some maintenance tips for you here, I hope it will be helpful to you.
Before repairing the LED display, you need to prepare tools such as a multimeter, an electric soldering iron, a blade, and tweezers. When detecting the fault of the LED display, it must be dealt with in the first priority and then the second way. The obvious serious problem will be dealt with first. The problem is not a big post-treatment. The short-circuit problem belongs to the highest priority and must be dealt with immediately. There are several methods in the repair process:
First,Observation method, through naked eye observation, open circuit is one of the problems often found in the observation method. It can be seen with the eyes, such as the circuit breaker caused by the scratching and plugging of the PCB circuit, or the circuit breaker caused by the accidental breaking of the electric drill.
Second, the comparison method, we can not see whether the IC is burnt out with the naked eye, we can replace it with a good IC; if the signal does not remember whether it was originally connected, we can use the unit board to measure the corresponding position to judge. The comparison method is often used in the maintenance process. It is very important to master this method, which allows you to quickly find out the fault.
Third, the elimination method, a failure of the full-color LED display may be caused by a variety of reasons. We need to accurately determine each cause of the failure of the display screen, and then deal with it one by one, but it should be noted that it must be processed according to the priority level.
Fourth, the resistance detection method, adjust the multimeter to the resistance gear, detect the ground resistance value of a certain point of a normal circuit board, and then test the same point of another same circuit board to test whether the resistance value is different from the normal resistance value. If not, the scope of the problem is determined.
Fifth,Voltage detection method, adjust the multimeter to the voltage level, detect the ground voltage of a certain point of the circuit suspected of having a problem, and compare whether it is similar to the normal value, otherwise the fault range of the display screen problem is determined.
Sixth, the short-circuit detection method, adjust the multimeter to the short-circuit detection block, and detect whether there is a short-circuit on the LED display screen. After the short-circuit is found, it must be solved first to ensure that other devices are not burned. Note: The short-circuit detection method must be operated with the circuit de-energized to avoid damage to the meter.
Seven, the voltage drop detection method, adjust the multimeter to the diode voltage drop detection gear, because all ICs are composed of many basic single components, but they are miniaturized, so when there is a current on one of its pins, it will be There will be a voltage drop across the pins. Generally, the voltage drop on the same pin of the same type of IC is similar, and the voltage drop value on the pin is relatively good or bad. Note: The voltage drop detection method must be operated with the circuit de-energized. This method has certain limitations. For example, if the detected device is high resistance, it cannot be detected.
To sum up the above, there are three main reasons for the failure of full-color LED display: open circuit, short circuit, and IC damage. If it is an open circuit, it can be solved by connecting the line where the signal is interrupted; if it is a short circuit problem, we just need to deal with the short circuit; the last problem, the IC damage is nothing to say, it is bad and replace it with a new one Just fine.