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Độ phân giải Màn hình LED
How to detect problem of LED Display
Even LED display is quite durable, but in the processing of using still have some problem, such as Computer software failure, the entire screen is not bright, the whole screen flower screen, parts not light, the area of the screen, the screen flash, and so on. Today Harse will show you how the detect these problem.
1.Through the short circuit test error
Dispatch multimeter to short circuit detection block (generally has alarm function, such as the general principles of the guide songs), detection module short circuit phenomenon, found that should be resolved immediately after the short circuit, short circuit fault phenomenon is the most common module. By observing the IC pins and needle pin can be found. Short circuit test should be under the condition of the power circuit operation, avoid damage to the multimeter. This method is the most commonly used to the method of simple and efficient. Most of the LED display fault judgment can pass the testing. Dispatch multimeter to short circuit detection block (generally has alarm function, such as the general principles of the guide songs), detection module short circuit phenomenon, found that should be resolved immediately after the short circuit, short circuit fault phenomenon is the most common module. By observing the IC pins and needle pin can be found. Short circuit test should be under the condition of the power circuit operation, avoid damage to the multimeter. This method is the most commonly used to the method of simple and efficient. Most of the LED display fault judgment can pass the testing.
2.Through the resistance detection error
Dispatch multimeter to resistance, detection a normal piece of circuit board of some point to the ground resistance, detection of another piece of the same circuit board of the same point test, if there are different with normal resistance if different criterion to determine the scope of the problem.
3.Through Pressure drop test error
Multimeter will be transferred to the pressure drop of the diode detecting, because all the IC is composed of the basic unit of many pieces, only the miniaturization and so on when a pin of it is energized, will exist voltage drop on the pin. Generally the same type IC pins on the pressure drop, according to the pressure drop on the pin value is good or bad, must be under the condition of the power circuit operation.
4.Through the voltage detection error
Dispatch multimeter to voltage, detecting the ground voltage of some point which doubt have problem, compare whether similar to normal, can easily determine the scope of the problem.