Maintenance method of LED display screen

I. inspection method for maintenance of led display screen

Led display maintenance detection methods, short circuit detection method, resistance detection method, voltage detection method, voltage drop detection method, then we talk about these methods in detail.

1. Short-circuit detection method: set the multimeter to the short-circuit detection block (generally with alarm function, such as sounding), detect whether there is short-circuit phenomenon, and solve the problem immediately after discovering the short-circuit phenomenon, which is also a common fault of LED display module.Some can be found by looking at IC pin and pin pin.Short circuit detection should be operated in case of circuit power failure to avoid damage to multimeter.This method is a common method, simple and efficient.90% of the faults can be detected by this method.

2, resistance detection method, the multimeter set to the resistance, test a normal circuit board at a point to the ground resistance value, and then test another same circuit board of the same point test and the normal resistance value is different, if not, determine the scope of the problem.

3. Voltage detection method: adjust the multimeter to the voltage range to detect the voltage to the ground at a certain point of the circuit suspected to have problems, and compare whether it is similar to the normal value, which can easily determine the scope of the problem.

4. Voltage drop detection method: adjust the multimeter to the diode voltage drop detection file. Because all IC is composed of many basic elements, it is only miniaturized.Generally, the voltage drop on the same IC pin of the same model is similar. According to the voltage drop value on the pin, it must be operated in the case of circuit power failure.

Second, maintenance tools

1, electric iron + suction gun 1, a number of solder

2. Electric batch one for quick removal of module or unit board

3. Computer + sending card, used for sending program of receiving card

4. A multimeter is used to detect specific faults of modules or unit boards

5. Tweezers, scissors and cutting pliers each 1

6, receive card +HUB board, used to observe module or unit board failure phenomenon

3. Basic maintenance steps of LED display screen

1. Determine the HUB board type used by the module or unit board so that the interface definition of the line is the same

2. Send the corresponding program to the receiving card according to the module or unit board of different models to ensure that the module and unit board are displayed under the correct program, which is the premise to find out the cause of failure.General PCB board will be printed with the module or unit board model.

3. Observe the phenomenon of module or unit plate and determine the initial failure.Such as the common blind lights, string points, small squares and so on.

4, use a multimeter to find fault, mainly using the above short-circuit detection method, the chip and lamp foot between detection.

5. Test again