As the LED display screen is gradually widely used, it can be seen almost everywhere in life, providing a variety of information displays; however, even the best product can not avoid problems when the LED display screen is the same. This kind of large-screen display equipment is composed of multiple LED display unit modules. It will also encounter this or that problem during use. Today, Winbond Ying Optoelectronics editor will learn the maintenance method of LED display together with everyone. .
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1 Observation method, observation method and screen observation with naked eyes, sometimes the open circuit can be seen by the eyes, such as the PCB circuit is broken due to scratching, and sometimes the electric drill is accidentally broken!
2 Contrast method. The contrast method is very important and critical. Sometimes we can’t tell 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 in the first place. We can measure it with a good unit board. What is the corresponding position of the next? The contrast method is very important!
3 Remedy, sometimes there are many reasons for a fault, we can deal with it one by one, if you don't remember, you can look at the previous common fault handling, and eliminate one by one!
4. Resistance detection method, adjust the multimeter to the resistance position, detect the resistance value of 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. If they are different, the scope of the problem is determined.
5. Voltage detection method, adjust the multimeter to the voltage range, 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 scope of the problem is determined.
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6. Short-circuit detection method, set the multimeter to the short-circuit detection gear (some are diode voltage drop gears or resistance gears, usually with alarm function), and detect whether there is a short-circuit phenomenon. If a short-circuit is found, it should be solved first to prevent it from burning Other devices. This method must be operated when the circuit is powered off to avoid damage to 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, but are miniaturized, so when there is a current passing through one of its pins, There will be a voltage drop across the pin. Generally, the voltage drop on the same pin of the same type of IC is similar. According to the voltage drop value on the pin, it is necessary to operate with the circuit power off. This method has certain limitations. For example, if the tested device is high-impedance, it cannot be detected.
The above is Winbond Ying Optoelectronics summarizes some maintenance methods for LED display screens for everyone. I hope it will be helpful to your school LED display knowledge or engaged in LED display related industries. If there are deficiencies, please feel free to add; if you have more For more questions about LED display or large-screen display project requirements, please feel free to consult
