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Aiwa TS-W9 powered subwoofer, sound is gone

Brothers,
I have here an Aiwa Powered Subwoofer TS-W9 model, with trouble.
I bought this from some of my friends.

The trouble of this unit is the sound is gone. But the red light indicator is on.
The trouble begins with a getting weaker and weaker bass and distorted. And lately it is now just humming and no sound.

Could you tell me please what parts of this are damage or not working.

Thank you.
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