1, to eliminate the problem of the speaker, you can use a battery to test whether the speaker is in good condition. If the horn is broken, you can repair it, or replace it with a horn with the same caliber and power.
2. If it is an amplifier problem, please detect it according to the following methods:
A, first look at whether the fuse is broken. If the fuse is broken, please replace the fuse of the same type.
B. If the stereo is turned on after replacing the fuse, there is still no movement, such as the indicator light goes out and the speaker is silent, which may be that the power transformer is broken.
C, after turning on the stereo, you can hear a slight current sound, indicating that the power amplifier film of the power amplifier is not broken. Check whether the audio input line is connected incorrectly.
D, sound source, audio input line is in good condition, is the front stage of the power amplifier voltage amplification circuit is out of order, if you can't rule out, please professional master maintenance.