Brief analysis of circuit fault

In the process of debugging the circuit , Unexpected failures are inevitable , How to effectively analyze and solve these faults , It is the key to ensure the smooth delivery of products , The circuit fault can be diagnosed by the corresponding traditional Chinese medicine treatment , That is, look, hear, and ask , According to the order , First look , Observe whether there are obvious abnormal points in the faulty circuit , For example, a blown fuse 、 Blackened devices 、 Abnormal phenomena such as excess tin beads , Next, smell , Whether there is abnormal odor , For example, the burnt smell of burned components , Then I asked , Ask whether the previous process of the product is abnormal , Whether the process conforms to the specification , For example, the temperature of welding devices 、 Torque for installing devices, etc , Finally, cut , Test whether the resistance value of each key point is normal through the instrument , Will verify the fault by changing the device , For example, the replacement of the suspicious circuit board , Go through the four steps above , It can basically solve most of the circuit faults . For reference only ！