One satellite speaker generates no sound or distorted sound, but the other one works fine. Why?
In order to more precisely identify the problem, please try swapping the channel positions of the two satellite speakers. It should be possible to find out if the problem is a defective satellite speaker, or if it has to do with the electronics of the amplifier. If the satellite speaker functions after the swap, then the electronics of the amplifier may be defective. If not, the satellite speaker is likely broken.