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Same thing here, I'm afraid, my Boston TeeVee 20 sub randomly goes on and off. I've taken it apart and to see if it might be the fuse and unfortunately the fuse isn't a standard unit, rather it's a "built in thermal fuse", see picture. This isn't going to be easily switchable, and in any case I'm not convinced the fuse is the problem as the sub sometimes does come on--sounds more like a wiring issue to me. Shame as now that I've got this opened up it's clearly a well-made device, other than the issue we're running into.
It is probably an issue with the sub amplifier, but could be a blown speaker if it has been driven too hard. If you bought it new within the last year then you should be able to get it repaired under guarantee at the shop you bought it from.
Check the status indicator - The LED found on the front panel should be illuminate in blue
when the subwoofer is functioning. If the unit is in Auto mode and is not receiving a signal, the light will remain off. Try setting the power switch on the back to ON if in the Auto setting.
Post back the status of your LED.
The receiver automatic speaker set-up set the sub volume at -12 and since it was not getting any signals from the receiver it was doing what it is supposed to be doing (going to the standby mode). This was troubleshooted by Onkyo tech support on a Sunday. All the best about Onkyo customer support.
if u are a technician then its easy to check, problems are, blown fuse, power amp IC output transistor may be blown, check for burnt componenets. changing and blowing a fuse means ur output IC or transistors are shorted.