LED electronic display fault test four methods
Time:2018-10-13
Views:760
With the popularization and application of LED electronic displays, LED displays have become a beautiful landscape in today‘s information society. Especially when night comes, LED displays open up bright images, making people feel the colorful world.In the process of the ever-expanding application scope of LED electronic display, there are more and more failures on the display screen. So how to test the failures of LED electronic display?Let me explain it to you at www.zhangchongshun.cn.
I. resistance detection method: the multimeter is adjusted to the resistance file to detect the ground resistance value of a certain point of a normal circuit board, and then check whether the same point of another same circuit board is different from the normal resistance value. If it is different, the range of the problem is determined.
2. Voltage detection method: the multimeter is adjusted to the voltage level to detect the ground voltage at a certain point in the circuit suspected to have a problem and compare whether it is similar to normal value; otherwise, the range of the problem is determined.
3. Short-circuit detection method: adjust the multimeter to the short-circuit detection device (some have diode pressure drop or resistance, which generally have the alarm function), detect whether there is a short circuit phenomenon, and give priority to solve after finding the short circuit, so that other devices will not burn down.The method must be operated in case of power failure to avoid damage to the table.
Iv. Pressure drop detection method: the multimeter is adjusted to the diode pressure drop detection file. Since all IC is composed of many basic unit parts, which are only miniaturized, voltage drop will exist on the pin when there is a current passing through one of its pins.Generally, the pressure drop on the same pin of the same IC of the same model is similar. According to the pressure drop value on the pin, it is better or worse, and the operation must be conducted under the circumstance that the circuit is cut off.This method has some limitations. For example, if the detected device is high resistance, it cannot be detected.
The above is deronshire small make up to the LED electronic display fault test method summary, hoped to be helpful to everyone.
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