Why doesn't Shenzhen Hangsheng electronic car stereo ring?

Line failure: Due to the aging of the line, the internal plastic may be cut and rubbed, resulting in the disconnection or poor contact of the line, resulting in no sound in the sound. The sound is damaged. The car's power supply is insufficient, resulting in no sound in the stereo. Setting problems such as setting stereo to left and right channels can also lead to stereo mute.