Solution: (1) LED control card parameters are set correctly Anhui led unit board, there is no signal is transmitted to the electronic display LED control card; (2) the communication line is normal communication, LED control card view if there is signal input; ( 3) LED control card 5V power supply is normal; Solution: (1) Restart your computer Linyi led unit board, continuously press the F8 key, the advanced boot menu, choose to enter "safe mode" Enter the landing system, and then enter the display in the windows settings, select 16-color state, click on the "Apply" button led unit board, click on the "OK" button. (2) Restart the computer in normal mode windows Chengdu led unit board, enter the Device Manager, remove the graphics driver, restart your computer. These are full-color LED display presentation Huaping causes and solutions. If there do not understand, you can Baidu search Gao Jin photoelectric, directly to our engineers and technicians. Ningxia led unit board, led unit board, 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!