Today, LED displays have become a part of people's lives.Streets and alleys, square stations, you can see a variety of LED electronic displays of various sizes and shapes.It is a systematic project integrating optical, structural mechanics, electronics and computer science.According to statistics, 90% of LED displays have large or small faults.To this end, we summarize the main reasons for these failures,I believe that with these, we can control the generation of faults from the source and improve the quality of the display.