1. Observation method: We can observe the failure of many components through vision, touch and smell. For example, if the components are damaged, they will change color, blisters or burn spots; when electrical components are burned out, they will produce odors. ; The short-circuited chip will feel hot when we touch it.
2. Elimination method: The elimination method is actually to judge the cause of the fault by plugging in some plug-in boards or components in the machine. If the condition of the equipment becomes better after removing a certain component, it means that we have removed it. This component is the cause of the failure.
3. Replacement method: When we have two equipment of the same model, if one of them is damaged, we can remove the good parts from the other equipment for replacement, and then test whether it can operate normally.
4. Parallel method: If the cause of the fault is caused by an open circuit or poor contact inside the component, we can connect a good component in parallel with the component that needs to be checked and maintain good contact, so that the faulty component can be removed Check it out.
5. Temperature rise and fall method: Some failures may be related to the temperature of the environment. We can use the method of rubbing absolute alcohol on the failure location to cool it down, and then observe whether the failure is eliminated. Similarly, we can also increase the temperature of the environment to observe whether the equipment will fail in a high temperature environment.