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The current maintenance mode of the display unit has definite limitation. Aiming at solving this problem, a new diagnosis and maintenance scheme for display unit is presented in this paper.Software realization has also been carried out .The monitoring software can monitor the application program and record the fault automatically. The fault information is extracted at the same time, so that this program can provide convenience to follow-up designers to analyze and deal with the fault. Firmware maintenance tool supports firmware upgrade ,backup and a key upgrade through the connection between Ethernet and monitor. In conclusion ,this tool greatly enhances the efficiency. Software has a good interface, and can been used easily. At the same time, the design process of software minimizes the coupling degree and portability of software has been improved greatly.