We talked about a lot of the above LED failure is usually routine inspection and testing of the LED can not be found. In addition to electrostatic discharge, large current (caused by excessive junction temperature), the improper use of an external force, etc., many LED failure at high temperatures, low temperatures, rapid changes in temperature or other adverse conditions, since the LED chip, an epoxy resin, stent the inner leads, solid crystal plastic, PPA and other materials cup thermal expansion coefficient differences p6 led unit board, triggering different internal stresses generated, therefore, quality testing LED is a very complex task. Speaking in mixed light led unit board p10, because of its three instrument chip design and construction, so that the distance is very small chip body led unit board, can be light in the same bracket cups mixed led unit board p10, unlike ordinary led The three chips led in a different, and in light of the poor performance mix. In a closer look, then paste the screen there with good viewing. In contrast is due to its structure for the three and one, smd will be small, the result is to have a small area of ??luminous form, and with large black area, which is very high contrast screen. led unit board, Gao Jin photovoltaic (online consultation), 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.