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According to the routine maintenance idea, we should first look at the outside and after the difficult, that is to observe whether the computer's external inserting needle is loose and distorted first, whether the internal components of the computer are deformed and broken, and there is no ablative and rusty odor inside. If there are no suspicious places through these visual inspection, we can compare the relevant information, find out the function of each pin on the computer, and find out the most likely fault pins according to the failure phenomenon, and use the digital multimeter to test it. When there is no circuit breakage or short circuit in the circuit, the corresponding principle circuit is drawn, or the voltage and current of the key parts are detected, and the fault location is confirmed.