1. With the increasing use of PCB circuit boards in various electronic devices, maintaining these boards has become an important field. Today, I will share my insights on PCB circuit board maintenance at this stage.

2. Currently, PCB applications in China span multiple sectors. During the initial production phase, the processes and raw materials are determined based on specific application requirements. However, as the usage frequency of finished products rises, common faults in circuit boards are likely to occur. Many people opt to replace the circuit board immediately, but the substantial costs (ranging from a few thousand to over a hundred thousand yuan) associated with PCB replacement can be a significant concern for companies.

3. Fortunately, in China, damaged circuit boards can often be repaired, making maintenance a more cost-effective option, typically accounting for only 20%-30% of the cost of new boards. For high-density, inseparable machinery and equipment, international ordering for replacement boards and circuit boards may be necessary, simplifying the maintenance process.

1. **Step 1: Circuit board inspection**

At this stage, many users lack circuit board design drawings after common circuit board failures occur. Despite various circuit boards, many people are skeptical about the maintenance of PCB circuit boards. Each circuit board is different, but their commonality is that they are all composed of various field-effect transistors, resistors, capacitors, and other components. Therefore, the damage to the PCB circuit board must be related to one or some of its components. Based on the above reasons, the concept of PCB repair has emerged. The maintenance personnel will first conduct a circuit board inspection, gradually identify the root cause of the problem, and replace the parts.

2. ** Step 2: Component replacement**

After identifying the root cause of common circuit board faults, maintenance engineers will strongly recommend replacement parts that match all circuit board application standards based on the characteristics of the original parts. Users can choose and replace according to their own needs. I won’t give too many instructions here.

3. ** Step 3: On board operation inspection**

It is crucial to evaluate the success of the repair after repairing the circuit board. Here, I suggest that maintenance technicians gradually accumulate experience and continuously improve standards throughout the entire process of PCB circuit board maintenance, inspection, and repair. Generally, electronic products are composed of countless electronic devices. Checking each electronic device one by one to identify problems during maintenance and repair processes will be time-consuming and difficult. Therefore, transitioning from common fault states to maintenance methods arising from unknown faults is a crucial maintenance strategy. If the circuit board is inspected, repair will become relatively simple.