Heavy Calcium Carbonate Carrier Additive Pharma Grade Calcium Carbonate Powder,White Calcium Carbonate Powder,Calcium Carbonate Med,Caco3 Filler Masterbatch Changxing Wanxing Building Material Co., Ltd. , https://www.wxbuildingmaterials.com
First, the LED display repair detection method 1, short-circuit detection method, the multimeter to short-circuit detection block (usually has an alarm function, such as conduction will be issued a chirping sound), the detection of whether there is a short circuit phenomenon, short circuit should be found immediately To solve, the short circuit phenomenon is also the most common LED display module failure. Some can be found by looking at the IC pin and the pin header. Short-circuit detection should be performed with the circuit powered down to avoid damage to the multimeter. This method is the most commonly used method, simple and efficient. 90% of the faults can be detected by this method.
2. Resistance detection method: Adjust the multimeter to the resistance file, detect the resistance value of a certain point of a normal circuit board to the ground, and then test if the same point of another circuit board has the same resistance value and the normal resistance value. If it is different then the scope of the problem is determined.
3, voltage detection method, the multimeter to the voltage file, to detect a problem in the circuit of a point of the voltage to the ground, whether compared with the normal value, you can easily determine the scope of the problem.
4, pressure drop detection method, the multimeter to the diode drop detection file, because all of the IC is composed of many basic units, but miniaturized, so when there is a current through a pin, There will be a voltage drop on the pin. Generally, the voltage drop on the same pin of the same type of IC is similar, and the voltage drop on the pin is better or worse, and the circuit must be operated under the condition of power off.
Second, LED display maintenance necessary tools
1. One soldering iron and one sniffer, one soldering power supply with a number of 2, 5V power supply, power supply to the receiving card and maintenance module or unit board, 3, one electric batch, for quick disassembly of module or unit board 4, computer + send card, used to send the program to the receiving card 5, the receiver card + HUB board, used to observe the module or unit board failure phenomenon 6, a multimeter, used to detect module or unit board specific failures , scissors, and pliers
Third, LED display maintenance basic steps 1, determine the type of module or unit board used HUB board type, so that the cable interface definition can be the same 2, according to different models of the module or unit board, send the corresponding program to the receiving card, Make sure that the module and cell board are displayed under the correct program, which is the prerequisite for finding the cause of the fault. The model of the module or cell board is printed on the general PCB.
3. Observe the phenomenon of module or cell board and determine the initial failure. For example, common Xenon lamps, strings, small boxes, etc.
4, using a multimeter to identify the fault, mainly using the above short-circuit detection method to detect between the chip and the lamp leg.
5. Test again.
LED display basic maintenance testing method and steps
LED display repair detection methods are divided into: 1, short-circuit detection method; 2, resistance detection method; 3, voltage detection method; 4, pressure drop detection method.