JBL 140/230 problem

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Hi all,
I've a problem with this subwoofer 140/230.
It has a LED that signals an input signal or not; if the circuit detects the input signal becomes green, otherwise it remains red. In this subwoofer, the LED always turns green, even without input signal, and it does not sound...
I disassembled all the cards, downloaded the schematic from http://diagramasde.com/diagramas/audio/SCS140 - SCS146 Service manual.pdf and checked the components. It sounds all right, damn it!
No ideas here...please help!!!
 
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