The root cause of uneven are: inconsistency LED performance parameters; the display in the production, installation assembled lack of precision; the electrical parameters is not enough consistency to other electronic components; module, PCB design is not standardized. The "inconsistent with the performance parameters of the LED" is the main reason. p5 led unit board. These inconsistent performance parameters include: light intensity is inconsistent, the optical axis is inconsistent, inconsistent color coordinates, inconsistent color light intensity distribution curve of each group and damping characteristics inconsistent. Solution: (1) LED control card parameter settings are correct, there is no signal is transmitted to the electronic display LED control card; (2) the communication line is normal communication, LED control card Check whether a signal input; (3) LED control Card 5V power supply is normal; Linyi led unit board | Gao Jin photovoltaic (Online) | led unit board provided by Jinan Optoelectronics Technology Co., Ltd. Gao Jin. Jinan Gao Jin Optoelectronics Technology Co., Ltd. (www.gjlled.cn) is an industry leader in Jinan, Shandong, liquid crystal devices, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Gao Jin photoelectric leadership with the staff warmly welcome all inquiries negotiations to create high gold Photoelectric better future.