a simple way to judge whether the power amplifier is damaged or the speaker is damaged: remove the speaker cable connected to the power amplifier, find a No.5 battery (be careful to have electricity), press one end of the speaker lead wire on one electrode of the battery, and the other end of the speaker lead wire touches the other electrode of the battery (be careful not to touch it for a long time). If the speaker is not broken, you can hear a click sound synchronized with the touch at this time. If there is no sound, the speaker is very good. At this time, the speaker can be further disassembled for inspection. Judging the quality of the speaker, the quality of the power amplifier will be judged. Of course, there is also the possibility that the power amplifier and the speaker will be damaged at the same time.

if you are satisfied with my answer, please adopt it in time!