Bose Lifestyle 20 Subwoofer Not Turning On


New member
Username: Nogger

Post Number: 1
Registered: Mar-14
Hi all

Because i have an electronics background i
have been asked by a friend to take a look at his Bose Lifestyle 20 Subwoofer.
It just doesn't turn on at all .

Looking at the board i can see it has a Triac & Opto-Coupler to switch the AC to the transformer & i have applied a 10v signal (as noted elsewhere on this forum)to try to switch it on but nothing. I have searched high & low for the circuit diagram or service manual for this particular model but found nothing. Anyone have any idea where i can source a diagram or have any pointers as to what to check.

Thanks in advance

New member
Username: Imagetek

Post Number: 2
Registered: Mar-14
Hi Graham, whenever you get an appropriate answer let me know because I have the exact same symptom with my AM25P bass box (Lifestyle 12 series II)

New member
Username: Don14

Post Number: 2
Registered: Oct-14
Hi there,

Appreciate if you could share the service manual coz I have a lifestyle 20 that needs repair.


Gold Member
Username: Magfan


Post Number: 3204
Registered: Oct-07
Bose is maybe the LEAST forthcoming company for this kind of information.
I've read rumors of people having some documentation but you won't get it from BOSE.

They simply make too much money with stuff with a known (to them) weak point which they can 'fix' for pennies while charging some outrageous flat rate!
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