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This paper discusses the principles and methods of circuit board fault diagnosis based on multiple images, and researches infrared imaging technology, visible light image processing and analysis technology, circuit board fault diagnosis technology, through the use of image enhancement technology, image smoothing technology, image processing technology Binary processing technology, etc., filter and smooth the collected circuit board images; use differential heat map method and sequence heat map method to analyze the temperature characteristics of circuit boards and their components and determine faults; The Harris corner detection method realizes the registration of the visible light image and the infrared thermal image of the circuit board, and then realizes the fault location under the infrared thermal image detection on the visible light image, which is convenient to find the location of the fault and intuitively view the faulty components The resulting phenomenon.