Shandong LED unit board display full-screen failure: A. entire screen is not bright (black) 1, the detection power supply is powered on. 2, testing the communication cable is plugged in led display manufacturers, for ground fault. (Synchronous screen) 3, synchronous screen detection sending card and receiving cards communication whether the flashing green light. 4, the computer monitor is protected or display area is black or pure blue. (Synchronous screen) LED unit board does not shine a row, check whether the output line 4953 feet and feet through. 2, check 138 is normal. 3, 4953 check whether hot or burned. 4, 4953 to check whether there is a high level. 5, check whether the 138 and 4953 feet through control. Full color led display, high bright gold photovoltaic (certified), led by the Jinan display provides high Jinliang Optoelectronics Technology Co., Ltd .. Jinan High Jinliang Optoelectronics Technology Co., Ltd. (www.zhkyled.com) is an industry leader in Jinan, Shandong, liquid crystal device, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In high Jinliang photoelectric leadership with the staff warmly welcome all inquiries negotiations to create high Jinliang photoelectric a better future.