There may be the following reasons:

1. If there is poor contact between the adapter power cord and the adapter jack, the spark should be replaced, and the small metal column of the adapter jack should be cleaned.

2. The magnetic core of the switching transformer in the adapter is loose, but it can not be dealt with. If you can't stand it, open it and fill the switching transformer with resin.

The sound generated by the current flow interference, some adapters are not well shielded, the sound will be relatively loud, and it will not affect the use.

3. It is not normal for the current adapter to have a friction sound. After all, there is no sound device, and that may be the current sound. It is normal for there to be a slight friction sound inside the computer. After all, it needs to keep running for heat dissipation, and it is impossible to have no sound.

Power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances.

The power adapter is generally composed of a shell, a power transformer and a rectifier circuit. According to its output type, it can be divided into AC output type and DC output type; according to the connection method, it can be divided into wall type and desktop type.

Power adapters are widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communication equipment, power equipment, instrumentation and other fields.