Maintenance Methods and Steps of LED Display

LED displays are now increasingly visible in our lives, adding a bright touch to people's lives. However, we not only see the style, but also see the failure of the led display at critical moments, which is the most troublesome thing for users. So how do we solve it? First of all, we have to find out what problems will occur in the led display, such as led brightness, black screen, flashing and so on. So how do we maintain the led display, what should we pay attention to when maintaining? And what are the basic steps for maintenance? 

LED display problems are also ever-changing, so it is not good to specifically explain a specific problem, then we will talk about the full color led display maintenance detection methods and maintenance basic steps.

1. The detection method of LED display maintenance

LED display repair detection methods are, short-circuit detection method, resistance detection method, voltage detection method, pressure drop detection method, then we specifically talk about these methods.

(1) Short-circuit detection method: adjust the multimeter to the short-circuit detection block (generally with alarm function, if it is turned on, it will sound a beep), detect whether there is a short circuit phenomenon, and find it should be solved immediately after the short circuit. Short-circuit is also the most common LED malfunction. The display module is faulty. Some can be found by observing the IC pin and the pin header. Short-circuit detection should be performed in the event of a power failure to avoid damaging 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, and then test whether the same point of the same circuit board is tested differently from the normal resistance value. Then the scope of the problem is determined.

(3) Voltage detection method: the multimeter is adjusted to the voltage file to detect the voltage to the ground at a certain point of the circuit suspected of having a problem, and whether the comparison is normal or not, the range of the problem can be conveniently determined.

(4) Pressure drop detection method: adjust the multimeter to the diode voltage drop detection file, because all ICs are composed of a basic number of unit parts, but only miniaturized, so when there is current on one of its pins, it will There is a voltage drop across the pin. Generally, the voltage drop on the same pin of the IC of the same model is similar. According to the voltage drop value on the pin, it is necessary to operate under the condition that the circuit is powered off.

2. Maintenance tool

(1) One soldering iron + one sniffer, some solder.

(2) One batch of electric batch for quick disassembly of module or unit board.

(3) Computer + send card, used to send the program to the receiving card.

(4) A multimeter, used to detect module or unit board specific faults.

(5) One pair of tweezers, scissors, and cutting pliers.

(6) Receiving card + HUB board, used to observe module or unit board failure phenomenon.

3. LED display maintenance basic steps

(1) Determine the type of HUB board used by the module or unit board, so that the interface definition of the cable can be the same.

(2) According to different models of modules or unit boards, send the corresponding program to the receiving card to ensure that the module and the unit board are displayed under the correct program. This is the prerequisite for finding the cause of the fault. The model number of the module or unit board is printed on the general PCB board.

(3) Observe the led module or cell board phenomenon to determine the initial fault. For example, common xenon lamps, string points, small squares, etc.

(4) Use a multimeter to find the fault, mainly by using the above short-circuit detection method to detect between the chip and the lamp foot.

(5) Test again.

All of these are the maintenance methods and fundamental steps that Meady found at the critical moment for common faults. I hope can help you.