Maintenance and procedures of the LED display

An LED display repair detection method
1, short-circuit detection, the multimeter transferred to short-circuit detection block (usually with alarm function, such as guide the General Principles of the beep sound), detect the short circuit phenomenon, should be immediately resolved after a short circuit, short circuit is the most common LED display screen module failure. Some can be found by observing the pins of the IC pins and pin. The short-circuit detection in case of power failure of the circuit operation, avoid damage to the multimeter. This method is most commonly used method, simple and efficient. 90% of the fault can be detected through this method judgment.
2 resistance assay, the multimeter transferred to the resistance profile, a point of detection of a normal circuit board to the resistance value, and then detect another piece of the same circuit board with a point test and the normal resistance value is whether there are different If different then, to determine the scope of the problem.
3, the voltage detection method, the multimeter transferred to the voltage profile to detect suspected of a circuit to ground voltage, relatively similar to the normal, you can easily determine the scope of the problem.
4, the pressure drop assay, the multimeter transferred to the diode voltage drop detection file, because all of the IC are composed of many basic element, only small, so the current through a pin a voltage drop in the pin. Generally the same type of IC similar to the voltage drop on the same pin, the pin on the pressure drop is good or bad, to be operating in the case of power failure circuit.
Second, the LED display to repair an essential tool
An electric iron + sniffer 1, a number of solder
2,5 V power supply for a module or unit power supply board to receive cards and maintenance
3, an electric screwdriver, one for fast disassembly module or unit board
4, computer + to send cards, send a program used to receive the card
Receiver card + HUB board, board failure phenomena for observation module or unit
6, a multimeter, for the specific fault detection module or unit board
7, tweezers, scissors, pliers 1

Third, LED display maintenance of the basic steps
To determine the HUB board type of module or unit board, so that the cable interface defined in order to
2, according to the different types of module or unit board, to the receiver card to send the appropriate procedures to ensure that the module and cell plate in the correct procedure, which is the premise to identify the cause of the malfunction. The PCB will be printed on the module or unit board model.
3, the observation module or unit board phenomenon, to determine the initial failure. Such as common blind lamps, string point, a small box.
4, use a multimeter to find fault, is the use of the above short-circuit detection, were detected between the chip and light feet.
5, detected again