In the process of PCB use, you may encounter various faults and problems, such as circuit short circuit, component failure, etc. In order to diagnose and repair these faults quickly and accurately, engineers and technicians need to master certain fault diagnosis skills and repair methods. First, by observing and analyzing the fault phenomena, you can preliminarily determine the possible causes of the fault. Then, professional test equipment is used to test and measure the circuit to confirm the specific location of the fault. Once the fault point is found, corresponding repair measures can be taken, such as replacing components, repairing wires, etc. In the repair process, it is also necessary to pay attention to safety issues to avoid further damage. Through study and practice, engineers and technicians can gradually accumulate experience in fault diagnosis and repair and improve their skill level.