Home Theater Questions? Ask a Technician for Answers ASAP
Hello and sorry you're having problems.
Initially it would be worth trying to fully disconnect all components (the subwoofer umbilical cable, the subwoofer power cord, and the AC adapter from the Main unit) for at least 30 minutes and then plug everything back in and see if you have the same problem. This drains all residual current from the system and can in many cases enact a reset.
Beyond that, the only way you can test the AC/DC brick adapter is by using a multi-meter to probe the barrel connector that plugs into the Bose. There should be 24 VDC present at that connector. A multi-meter can be purchased at wal-mart for around $10. You will set the meter to DC volts, then place the red probe on the inside of the barrel adapter and the black probe around the metal shield. If you do not have 24 VDC present then the AC/DC adapter needs to be replaced. It can be purchased at the link below:
Beyond that this would indicate that the issue is actually internal to the Bose unit and you would in that case need to contact Bose to setup an RMA # to have the system repaired (since they are the only ones that service their equipment).
BOSE:For assistance with your product, please call us toll-free at 1-***-***-****. For help with our aviation headsets, call 1-***-***-****.For the best possible service, please have your product nearby when you call. Hours of operation: Monday – Friday: 8:30 AM – 8 PM ET
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