Although the LED Display is very durable, computer software failures may still occur during use, such as the entire screen does not light up, the entire screen is blurred, some areas are not illuminated, some areas are blurred, and the screen flickers. The following tips can be tested in four ways:
1. Through the voltage detection error, adjust the centimeter to the voltage range, detect the ground voltage of a certain point of the suspected circuit, and compare whether it is similar to the normal value, which can easily determine the scope of the problem.
2. Through short-circuit detection error, set the centimeter to the short-circuit detection gear (generally it has an alarm function, if it is turned on, it will beep), check whether there is a module short-circuit phenomenon, and solve it immediately after it is found. The short-circuit phenomenon is also the most common Module failure. Some can be found by observing the IC pins and header pins. The short circuit detection should be operated when the circuit is powered off to avoid damage to the centimeter. This method is the most commonly used method, simple and efficient. Most of the LED Display failures can be detected and judged by this method.
3. Through the voltage drop detection error, adjust the centimeter to the diode voltage drop detection gear, because all IC 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 on the pin. Generally speaking, the voltage drop on the IC pins of the same model is similar. According to the voltage drop value on the pins, it is necessary to operate with the circuit power off.
4. Through the resistance detection error, adjust the centimeter to the resistance gear, check the resistance value of a certain point of a normal circuit board, and then check the same point of another same circuit board to test whether the resistance value is different from the normal resistance value , If they are different, the scope of the problem is determined.