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The Bose Lifestyle 5 is not a 5.1 surround sound system. It is a 2.1 sound system, meaning it is stereo with a subwoofer/bass unit. Having two speakers that can be angled in different directions, the Bose Lifestyle 5 employs Bose direct/reflecting technology,providing greater audio presence. Still, it is definitely not a surround sound system.
This can be repaired of it's later than a series 1. (not sure if the 1997 model was a series 1)
Repair cost will be $225 plus tax (flat rate). Shipping is split between you and Bose.
They give you a new 1 year warranty.
Otherwise, Bose can have you trade this in for about 25% off a new, current system.
-If this still powers up, make sure the small 1/8" portion of the input cable (plugged into "system control 1") is in good condition, because you may just need to replace that input cable for a no audio situation. If it's a different series, it will say "zone 1" I think.
In either case, you should call Bose tech support about this. (800-367-4008) Make sure you're with your system so they know what series of LS5 this is.
I cannot exactly solve this issue but I can make a comment based on investigation. Lots of people have this issue but there are very few comments to help solve the issue unfortunately.
I have the same issue and have been able eliminate various things because I have a second complete Bose Lifestyle 5 system.
It is clear the issue does not lie in the Sub and is related to the Music centre unit. I can use a second identical music centre to power my sub just fine and my broken Music centre cannot drive my second sub.
Now the issue is knowing where to track down R428 in the music centre which is the suggested fix to this issue. I have opened my unit and there are resistors various Resistors in the 400 range but no R428.
If anyone can help with the location of R428 in the Music Centre I would be very grateful.