Question about Bose Acoustimass 15 System

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Woofer not powering on

I am having problems with my woofer not powering on. I have taken it all apart and the fuse underneath the circuit board is good. I was wondering about the resistor. Could it be the resistor? What else can I try. All the sudden one day it will turn on out of nowhere. Every time I unplug the woofer or shut it off it will not power back on. Than out of nowhere in the next couple days it will power on. Subwoofer (Acoustimas 15) will not power on. Having trouble removing the case to look inside. I remove the dials (for Bass and LFE levels) and try to slide the plastic case off but it won't budge. I try to gently pry it off with a screwdriver but am afraid of breaking it. So, is there something I am not doing right to remove the cover? I need to get at the fuse to see if it is open

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  • Master
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The powersupply is most likely the cause and would need to be replaced. Fuse is most likely ok, some parts of the powersuply would need to be replaced, id recommend replaceing the whole psu (powersupplyunit)

Posted on Mar 30, 2008

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  • Bose Master
  • 19,396 Answers

Check the power unit inside woofer, it was cause for same problem in my creative surround.

Posted on Mar 30, 2008

  • Ginko
    Ginko Mar 30, 2008

    In any case is not the resistor , if the resistor is gone you have no power at all all the time. to ensure that is not the resistor test it using a Digital Multimeter. If it has ohm infinite then resistor is broken. In my surround system I changed the whole supply unit, which is a block board/transformer inside the woofer, where you plug the power. I payed around £40 for the replacement. Before replacing it I tested all resistors, some IC and contact and did not find anything wrong.

    I think this kind of problem is due to a faulty contact on device power unit. they can work for a while, then they can break down for a while, because of movements or heath and use factors.

    Regards

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1 Answer

Why does it randomly lose power?


Hello, I can not say what the direct cause is,

perhaps some soldering points on the printed circuit bords are loosen due to thermic stress. test: give mechanical ticks on the woofer while he is playing to check this.
Hope you will have succes.

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I have the same problem with my Cambridge Soundworks CSW250. Also one of the speakers doesn't work all the time. I'm sure it's a loose connection on the circuit board. When I tap the subwoofer near the connections, the popping noise changes (gets worse, better, other speaker works,etc.).I tried taking the subwoofer apart, but the area near the connections is sealed with glue, so I cannot access it. I hate it because when it works,it sounds so good. Anyone know how to get just the circuit board and back panel?

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This might very well be a fuse - check by setting the sub woofer to "On" to see if it powers up. If it does, there may be a problem with the sub woofer audio cable(s) or connection(s).

Don't forget to check for a tripped circuit breaker or blown fuse on the stereo's speaker output. If your sub is connected to a low level output - this shouldn't be a possible cause - as circuit breakers & fuses are usually on amplified (high level) or speaker outputs.

Another possibility is that the settings of the stereo has been changed from a *.1 system to plain stereo 2.0 or some other setting that disables the LFE (low frequency effects) or sub woofer audio output.

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r_ic7

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