Question about Bose Lifestyle 12 System

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Humming sound I have a Bose Lifestyle 12 system which I bought 6 years ago. Of late, whenever I turn on the receiver, I get a continous humming sound coming from the sub-woofer. The same thing happens when I have it connected to my tv. Surprisingly, when I played a music CD, it the system performed ok as it should be. Would you have any idea what could be wrong ? If I need to take it the the service centre, I am not sure if I have to bring the whole system - or perhaps just the sub-woofer. Thank you.

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  • Anonymous May 22, 2009

    Hi, we have the same problem. When the Bose woofer is left on but the amp if off a vibrating humming and every 5 mins or so a popping sound.I always need to turn the woofer off.

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  • 15 Answers

I think it's time for you to upgrade to a new system. If not, try to see if you can get someone that's great with fixing electronics to repair it or return it to the manufacturer for a replacement.

Posted on May 15, 2017

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Posted on Jan 02, 2017

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SOURCE: Bose Lifestyle 38

No reset button. Simply unplug the power cord in the rear, wait 20 seconds and power back up.

Posted on Dec 24, 2007

  • 1 Answer

SOURCE: bose lifestyle no sound

I' have pulled out the plug for more than 1 min, and afterwards it worked again. Full sound again

Posted on Feb 02, 2008

  • 1 Answer

SOURCE: Lifestyle 48 locked up

Just got off phone with Bose support with this very problem during install of a VS-2 software updtae to an older LS48 system. (Bose support personnel were very helpful on phone - and walked me through procedure to solve). I presume you unplugged and replugged power supply with no resolution. In that case, unplug power supply, wait 30 seconds and while holding down the "open/close button" and the "store" button (on media center) plug the power supply back in. Continue holding until the "Bose Lifestyle" message disappears. I presume this puts the system into a diagnostic mode, as the next steps in my case were to press and hold the "erase" button while scrolling through a menu of options using the "volume up" button. I believe it was the third "volume up" press that brought me to "FLASH" on the system screen. At that point I was told to release the "erase" button and press the enter button. The system rebooted and my VS-2 install went smoothly after that.
I'd recomend calling Bose support (800-905-2138) since your lockup occured during a CD load vs a software update (just to be on the safe side) - I was talking to a live tech support person in less than 15 seconds... a pleasant surprise.

Posted on Feb 05, 2008

  • 1 Answer

SOURCE: Bose Lifestyle V20 Error 180

OK talked with Bose just a minute ago and they were able to correct the issue.

We disabled the power cord from the back of the media console (where the HDMI cables connect) and left it off for a minute or two.

Powered the media console back on and it is working as expected.

Was told by the Bose tech that the common reason for this issue is due to the use of the HDMI cables that have a propritary security protocol that is used between the media console and the component it is attached to (ie TV, Cable/Sat, BluRay ...ect).

I asked if there was a BIOS upgrade if it was indeed a "handshaking" issue and was told there was not one (yet).

If one becomes available, it will be shipped via mail on a CD\DVD that can be used in a CD\DVD player that is connected to the media console using the HDMI cable.

Hope this helps!

Posted on Jan 26, 2009

  • 1 Answer

SOURCE: bose acoustimass 25 subwoofer has no power

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

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