Hi guys,
Trying to salvage a Bose Companion 5 computer speaker system that powers off shortly after powering on. It's got a primary USB input (built in DAC) and an aux 3.5mm input. The USB appears to be the primarily source that tells the unit to power on (control pod LED goes green) as the unit has no power switch.
When I first connect power to the unit, plug in the USB, it will play audio nicely for a minute before it drops out and the unit appears to go into standby (control pod LED goes red). It stays in standby and I cannot seem to power it back on without physically cycling the power.
I've read through the service manual and have followed all the tests on the Troubleshooting Tips page of the manual on page 33. On the Q10 voltage test, I got 18V instead of 21V on pin "S". Voltages on pins "G" and "D" follow the spec. Not sure how much that matters.
I also tested L50 (1.2VDC) and Vsnub (26V) appropriately, however, wasn't comfortable running the unit until it powers off to see if these voltages are cut. Reason being is the heatsink has to come off to test these points and the chips were heating up fast so I didn't want to push my luck.
Anyways, I'm completely stumped now. If anyone has any suggestions on what else to try or test, I've love to hear! This is a decent unit and I'd hate for it to go to waste.
Thanks!
Service manual reference here:
https://www.manualslib.com/manual/18...mpanion-5.html
Trying to salvage a Bose Companion 5 computer speaker system that powers off shortly after powering on. It's got a primary USB input (built in DAC) and an aux 3.5mm input. The USB appears to be the primarily source that tells the unit to power on (control pod LED goes green) as the unit has no power switch.
When I first connect power to the unit, plug in the USB, it will play audio nicely for a minute before it drops out and the unit appears to go into standby (control pod LED goes red). It stays in standby and I cannot seem to power it back on without physically cycling the power.
I've read through the service manual and have followed all the tests on the Troubleshooting Tips page of the manual on page 33. On the Q10 voltage test, I got 18V instead of 21V on pin "S". Voltages on pins "G" and "D" follow the spec. Not sure how much that matters.
I also tested L50 (1.2VDC) and Vsnub (26V) appropriately, however, wasn't comfortable running the unit until it powers off to see if these voltages are cut. Reason being is the heatsink has to come off to test these points and the chips were heating up fast so I didn't want to push my luck.
Anyways, I'm completely stumped now. If anyone has any suggestions on what else to try or test, I've love to hear! This is a decent unit and I'd hate for it to go to waste.
Thanks!
Service manual reference here:
https://www.manualslib.com/manual/18...mpanion-5.html
