Question about Bose Lifestyle 25 System

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Bose acoustimass 25 subwoofer has no power

My bose lifestyle system is not working. My receiver has power but I cannot get any sound out of the speakers or sub. I looked at the fuse in the subwoofer but it looks ok, i think.

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  • Anonymous Nov 29, 2008

    I have the same problem. I can't even figure out how to crack open the subwoofer.

  • LaserMark4 Dec 04, 2008

    Just have the same problem today in our motorhome this morning. Worked fine yesterday and now no sounds coming from unit. Switches between Video, Aux, CD, etc. just fine. CD player seems working fine.

    Just no audio-- ???


  • lscarduzio Jan 26, 2009

    I have problem and can also not get the cover off :(



    I am going to be spending time working on it this week ..

    THanks Lisa

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Honestly speaking you should probably not work on this unit yourself: "There are no user serviceable parts inside"

Even if you are an accomplished Electrical Engineer Bose will not provide the required schematics to troubleshoot and repair this unit.

Are you still undaunted . . . then if the case is the original LS-25 series, there is a hidden catch at the end of the cover furthest from the input connectors that needs to be rotated (until a plastic tab is sticking out), which you can do with a flat bladed screw driver, and you also need to remove a few screws from the bay where all of the connectors reside. Remove the two knobs from the side of the cover. Then hit the case with your fist at the far end (plastic tab) and the cover should then pop off. You may have to hit it hard, with an upward motion.

Note there is not going to be much you can do to fix this beyond replacing the fuse. (Note that the fuse may be soldered in.) The bass amplifier is op-amp based with discrete class G output stage and the twiddler amps are monolithics with discrete class G circuitry shared between several channels.

The power transformer has a thermal fuse in it as well which is not replaceable. If you play the unit loudly for long periods of time and it is not adequately ventilated it is possible for the thermal fuse to open - if this is the case you will definitely need to send it in for service.

When plugged in there are hazardous voltages present on the top PC board where the power connector is located, whether or not the unit is turned on.

Power switching is via a triac controlled by whichever front end you have CD-5? 12V should be present on the mini plug (tip I think, but might be ring) when the music center is on.

There is also offset detection circuitry that will latch the unit off should any output have more than a volt or so of offset.


For more information see following web site:

http://www.diyaudio.com/forums/showthread/t-106135.html

Posted on Mar 01, 2009

  • yardsaler Aug 18, 2010

    I want to thank igwing for post. I bought a Bose Lifestyle 25 Series II System at a yard sale for $35.00! Once we got the system set up, it appeared that the base unit was not getting power. My husband was able to get the cover off by reading your post. The power fuse was blown and a $3 trip to radio shack ended up giving usthe most incredible surround system. That 1999 Bose system blows away the "standard" type surround we bought last year. Thank you Thank you!

  • orlando Andrews Sep 18, 2012

    Fabulous!!! We have also just used your expert advice to get our subwoofer going.

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