LED unit board does not shine one, check 595 is normal. 2, check the upper and lower leg through the corresponding module is switched on. 3, check whether the output pin to 595 feet through the module. A lack of color LED unit board, 245 RG check whether there is output data. Are 2, check 595 normal and abnormal output pin 595 through input pin PWM LED driving current regulation mode PWM adjustment method is the use of a specific duty pulse driving waveform in a cycle to drive the LED manner. Shenzhen Optoelectronic Technology Co., cloud led unit board structure, the average duty cycle of the LED drive current is determined by the pulse waveform and the LED drive current ratings Beijing led unit board, LED rated at a fixed drive current. By varying the duty cycle, you can change the average LED drive current, thereby changing the LED output intensity. In order to avoid flickering effect. Pulse waveform frequency is usually greater than 200Hz. Liaoning led unit board, led unit board, high Jinliang photoelectric provided by Jinan High Jinliang Optoelectronics Technology Co., Ltd .. Jinan High Jinliang Optoelectronics Technology Co., Ltd. (www.zhkyled.com) strong, credible, in Jinan, Shandong liquid crystal device industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the high Jinliang photoelectric and you hand into the brilliant, for a better future!