Sub woofer does not power on
Most likely cause is ZD3 has gone bad. It is known to go short and cause no power in these subs. It is an 18v zener diode. Also, check R9 on the back of that board. It should be 10ohm, but sometimes goes open when ZD3 shorts.
Is it receiving power? If not that is your answer - could be a blown fuse, bad wire, bad connection, etc.
If power is there and it still does not work then the problem coud be with a bad sub woofer on/off switch, internal fuse, or worse, blown amp from over driving.
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