Today, LED display signs can be found everywhere, in large shopping malls, roadside stores, elevators and even taxis.It brings a fast and convenient information age to our life, and also adds a beautiful color to the city’s environmental decoration.but due to the lack of LED display module hardware maintenance technology, most LED display users can only send the faulty LED modules Hardware back to the manufacturer for repair, resulting in many problems such as high product transportation costs and deep customer complaints（as shown in the following figure ）.To this end, we wrote “The Guidance To Repair Led Display Module” article, for your reference
1. LED Display Modules Construction
LED Modules It is one of the core components of LED display. The quality of the LED modules directly affects the performance of the led display signs.The unit board is composed of LED module, driver chip and PCB.The LED module is actually composed of many LED luminescence points encapsulated by resin or plastic lattice. According to use occasion, LED modules are divided into indoor LED display module and outdoor LEd display module.
LED Display Module Framework
LED Module Power Supply & Cables
Common use LED Sign Chips inforamtion as below:
2. LED Module Fault Description﹠Solutions
Q1: The whole LED module has no power / dark screen ;
A1: Check the LED module power supply/ module power cable and power connector working good or not
Q2: Two or more LED modules connected together, Showing the image is abnormal;
A2: Check the LED modules data cable / HUB port data connector working good or not
Q3: When the LED modules powered on, there is single led lamp or several led lamps are black or the color show is inconsistent ;
A3: If led lamp is dark ,for this situation maybe it is the death of led lamp ,please replace by the new led lamps .If the led lamps` color showing is inconsistent, however when you press with your finger, the color returns to normal, for this situation caused by the led lamps` poor welding , then please welding led lamp again or replace to good ones.
Q4: When the led module powered on,there is one row of led lamps or several rows of leading lack of color
A4: Check if 74HC138 Decoding Chip and 4953 line Management Chip the Power Pin whether poor welding or short circuit then fix it or replace to new Chip
Q5:When LED module powered on, there is one line of led lamps the color display is inconsistent
A6:This fault is caused by the failure of the driver IC pin that controls the color display in this area. First, this IC needs to be found, The correct driver IC can be found by the circuit diagram on the back of the LED module then replaced and repaired the driver IC
3.LED Module Repair Process
LED Dispaly Module Repair Tools：
Replace Broken LEDs and ICs Process:
4. How to Replace the Broken LEDs of LED Signs Video Guide:
Youtube Link: https://www.youtube.com/watch?v=r2dRsjYfOq8&t=105s
Finally, most of the faults of the LED modules such are caused by reasonable failure rates, around 0.03%. After a period of use, LED module cannot be guaranteed to no need maintenance and repair. Therefore, it is important to customers to choose good quality and reliable led module’s manufacturer. Some other reasons that also could easily affect the failure rate of the modules are physical collision, improper use and installation, storing in the humid environment, so customers need to pay attention to the protection of the led module in installation and storage to minimize the failure rate of modules. When the module fails, hopefully, this article can help you identify the type of module failure and know how to repair by yourself, to avoid the waste of time and money brought by returning to the factory for repair.
If you are still have problems of how to repair led display signs,please send email to our technical department, email@example.com