What's with the noise when headphones are plugged into the phone?

You can try putting headphones on another phone or MP3. If the noise is still loud, there may be the following reasons:

1, the sensitivity of headphones is too high, and a small audio voltage can push it.

2. The earphone shielding wire falls off, or there is no shielding wire at all. Shielded wires should be completely wrapped with braided tape, and ordinary single-core grounding wires should not be used instead.

Solution:

1, change the earphone with low sensitivity and high impedance;

2. Replace the signal wire of the earphone with a shielded wire and weave it into a mesh signal wire;

3. Connect a ceramic capacitor 683 or 104 between the signal wire and the ground wire of the left and right channels for friends who know electronics and welding.

If there is no problem with putting the headset on another mobile phone, it means that the mobile phone has opened the plug-in or sound effect software, and you can restart or restore the factory settings.