Bose Companion 3 power supply board problem


New member
Username: Nippoo

Post Number: 1
Registered: Mar-10

I was trying to troubleshoot a problem with my Bose Companion 3 Series which is constantly making a low-pitched buzzing noise (about 50Hz, I'd guess) through all the speaker channels, including the sub. It does this even when the 'pod' shows an orange light - so it should be off - and no other sound comes out of any of the channels. (I've tried both inputs and several cables - no hint of any signal at the output, just buzzing.)

I think it's probably a problem with the power supply board. There's a three-wire cable joining the amp board and the power supply board to each other - with red, green, and black connectors. Currently the red connector is at +12V, and the black and green are both at 0V. I'm sure one of them should be different - perhaps -12V, or possibly +15V? I'm not sure.

And yes. I'm aware that Bose stands for "buy other sound equipment", etc... etc... I can't afford to, and was given this as a broken 'present' (hah)...

So - would love some schematics, or help...


New member
Username: Nippoo

Post Number: 2
Registered: Mar-10
By "connectors" I mean "wires"... red, green, black wires...

Gold Member
Username: Gavdawg

Albany, New York

Post Number: 1589
Registered: Nov-06
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