We know that, under normal circumstances, industrial PCB boards often need to be repaired. When repairing, it is necessary to check and understand the vulnerable parts on the circuit board. What is the reason that the circuit board components are fragile? The following Sanjing take everyone to understand.

First of all, the design is unreasonable. If the circuit board design is unreasonable, it is easy to cause the circuit board heat dissipation problem. Many circuit board damages are caused by poor heat dissipation design; secondly, the copper foil wire design of the circuit board is too thin, and it is easy to burn out due to overcurrent, which makes the main board. can not work.

Second, it is used frequently. For example, the drive motor of the circuit board, the rotating shaft, the switch tube of the switching power supply, and the commonly used buttons of the operation panel.

Third, the load is heavy, the power is large, and the working voltage is high. The power supply, drive circuit, power control device and other components of the circuit board are generally close to the heat sink. If the protection measures are not enough and the heat dissipation is not good, it is easy to malfunction.

Fourth, the protection circuit. The valuable chips or components on the circuit board are equipped with protective equipment. Once the circuit board is abnormal, the first problem is these protective circuits.

Fifth, the interface and cable of the inline seat and connector are in poor contact or disconnected. Such phenomena as poor contact between the board and the slot, poor contact between the line plugs and terminals, and false soldering of components.

The above is the reason why the PCB board is prone to failure, I hope it can be helpful to everyone!