Cause a lot of screen pixels out of control, p5.0 cell boards, the most important reason is that "LED failure." LED main cause of failure can be divided into two aspects: First LED its poor quality; the second is to use improper methods. Through analysis we summarize the correspondence between the LED failure modes and between the two main reason. The small size of the LED chip in order to improve the brightness, the cell plate, usually small angle package. The large size of the package does not require a small angle, p4 unit board, because it does not require high brightness. Therefore, the wholesale unit board, wide-angle (110) high-brightness low current is the best. For indoor LED display brightness because of low demand, a wider general audience, so SMD LED is the best option. p4 unit board _ Gao Jin photovoltaic (Online) _ Cell 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.