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After determining the damaged components, do not rush to replace them. After confirming that the peripheral equipment circuit is normal, consider replacing the damaged electrical components. When checking the integrated circuit, when the voltage of each pin of the integrated circuit is abnormal, do not rush to replace the integrated circuit, but check its peripheral circuit first, and then consider replacing the integrated circuit after confirming that the peripheral circuit is normal. If you do not check the peripheral circuits, and blindly replace the integrated circuit, you can only cause unnecessary losses, and the current integrated circuit has many pins, and it will be damaged if you don’t pay attention to it. It can be known from the maintenance practice that the failure rate of the peripheral circuits of integrated circuits is much higher than that of integrated circuits.