Solution: Check the display screen is abnormal body power source is working; the signal transmission line fault; Screen single module failure. A. output in question 1, the detection output interface to the signal output of the IC is connected or short circuit. 2, the detection output latch clock signal is normal. 3. The last driver to detect whether data cascaded output data interface port and output port connection between IC or short circuit. 4, chassis cooling is not good, resulting in temperature rise due to the graphics card. At home and abroad Most large LED display system consists essentially of LED control panel and a number of LED units connected in series in order plates. LED LED control panel and LED display unit board composed of the main system, which, LED unit board includes enhanced signal drive capability BUFFER circuit which generates a dynamic display scanning timing decoding circuit, a plurality of switches and a plurality of LED driver circuit . The communication process: communication signal LED control panel issued sequentially through each series of LED unit board BUFFER circuit driven enhancement; each LED unit BUFFER circuit board via enhanced scan signal (SCANO) available to the LED unit? board decoding circuit decoding circuit decoding to generate dynamic display scanning timing control switch; enable signal BUFFER circuit the enhanced (ENO) through each LED unit board, the latch signal (LATO), the clock signal (CLKO) are supplied to all of the LED unit board LED driver circuit. 3.7 LED display system module, a communication signal only after the data included in each LED unit board LED sequentially concatenated communication circuit, and then the LED drive circuit board of the LED unit by the data output of the LED control communication circuit, display refresh rate is only limited by the communication speed LED unit board the number of modules and LED communication circuit, so that the communication speed of the order of magnitude increase p12.5 module, in most applications, only output a LED control panel group communication signals, it can achieve control LED display system, LED display system that has a low production cost, ease of application support. p16 modules, modules, Gao Jin photoelectric provided by Jinan Optoelectronics Technology Co., Ltd. Gao Jin. Jinan Gao Jin Optoelectronics Technology Co., Ltd. (www.gjlled.cn) 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 Gao Jin photoelectric and you hand into the brilliant, for a better future!