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In the airborne electronic equipment repaired by the aviation equipment overhaul factory, it is often encountered in the early design of circuit board products, such products are relatively less measurable, the test plan is not clear and the product maintenance information is less, if encountered Due to equipment failure caused by circuit board failure, the maintenance cycle is long and the troubleshooting effect is unstable, which is very difficult for the maintenance unit to diagnose at the board level. The research on the early board-level automatic test system in China is biased towards the special board, the professionalism is weak and the versatility is weak, and there are few cases combining with the actual maintenance support application. This article is aimed at this short board and has strong versatility. The board-level product automatic test system and its application in avionics equipment were studied. The high-frequency video signal processing board was selected as a sample. The example was used to illustrate how to determine the board-level fault diagnosis based on the board-level test system. The design plan, designed the test development process, enhanced the completeness and diversity of the board-level fault diagnosis technology in the maintenance industry..