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In terms of the fault structure, the metal conductor (PIN pin/terminal) inside the connector is the core part of the whole. It is used to transfer the data signal or current of the external wires or cables to the connector contacts. Therefore, the connector design must be well-structured, have a very reliable stability and good conductivity.

Because this kind of situation is quite common, there are many reasons for it:

1. It may be due to the unreasonable design of the contact parts of the connectors.

2. Material selection is not in place, and the performance of metal or plastic materials is unstable.

3. Poor quality, unreasonable tolerance of insertion size, resulting in poor contact.

4. Reasons for coating falling off or oxidation on metal surface.

Therefore, when electronic devices fail, the first thing to consider is the contact problem. We must check all the joints and consider other problems when the connection is tight. One of the problems we need to pay attention to is the protection of connectors in the use process, which is also very important. Sometimes the poor contact is due to improper protection in peacetime, resulting in local damage or corrosion of the connector. The poor contact caused by this situation is generally difficult to repair. It is necessary to replace the connector. It is not only troublesome, but also a waste of resources and economic loss. Different connectors work in different environments and temperatures, only reasonable performance can be more stable.