Led unit board problems are divided into four points: 1, the entire board is not shining: mainly because of the power unit board or board within a missed line connection error, resulting in a difference of positive and negative circuits. 2, the board is not shining full color, normal delivery function: This is due to the damage caused by the built-in circuit board Jiangsu full color, can be 74HC138 4 feet and 5 feet caused by short circuit. 3, every three non-shiny: In 4953 the board is damaged. 4, interlaced shiny: to be able to analyze a circuit problem. ①: Check the cell plate Built 74HC245 and 74HC138 whether Weld. ②: use a multimeter to measure whether the 74HC138 1 foot voltage at 2.5V full color price, replace 74HC138③: measuring electricity transmission status lilies with ICA signals. Linyi Wang Tai Electronics Co., Ltd. is a professional manufacturer of LED display, monochrome and full color screen manufacturers. Yasuhiro Product Features: 1, Yasuhiro selected LED lights under the same lighting conditions, the degree of light industry decline of less than other manufacturers; 2, high brightness LED lights, adjustable brightness and sun glare under direct long-distance is still clearly visible; 3, Yasuhiro using a large angle LED lights manufacturer of full color, viewing angle, and optional user posted looks bigger perspective; 4, splitting ratio is less than 1: 1.2 (that is, any difference in brightness between the two LED lights less than 20%), good consistency, color uniformity. Full Color prices, Suqian full color, Yasuhiro photoelectric provided by Linyi Wang Tai Electronics Co., Ltd. Linyi Wang Tai Electronics Co., Ltd. (www.ledzkd.com) (www.ledzkd.com) strong, credible, in Linyi display equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving macro innovative ideas will lead Thailand into the brilliant photoelectric and you work for a better future!