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you might want to google the service manual for the system as i did. this will show you how to take it apart. after doing so check the solder points along the dc power jack( power adapter plug on the unit). i was having the same issue and carefully inspected all the components... i resoldered the dc power jack and viola! powers up. btw, my system is bose acoustimass 5 music center model 5 (1995). good luck!
I have had problems similar to this on many devices and it is usually a dud LED (light). You can technically de-solder the current LED and replace it but it's not a job for anybody without very good soldering skills.
Check to see if your system is still in warranty as this should be covered. Any electronics repair shop should be able to fix this for you.
According to other threads this is due to a bad capacitor (either C19 or C16). It is a 33uF capacitor rated at 25V. Needs to be replaced by a 33uF higher voltage (like 63V). Have the same issue but have not yet completed the fix. Please perform a search on the forum and you will find it. It says is on the lower left side of the console pcb.
Here's what the Bose support website suggests. Good Luck!
Messages displayed during a Music Information Update
Messages may appear on your media center display during a Music Information Update. If you see a message with instructions to call Bose, and a three-digit code such as "Error Code 802" or "Failed 172" while performing a Music Information Update, it does not necessarily mean there's something wrong with the system. Performing a media center reset and installing the update again may address the issue.
To reset your media center, follow these steps:
Turn the media center off. Wait two minutes
Unplug the power cord from the media center. Wait 30 seconds
Reconnect the power cord
Wait until "Bose Lifestyle" disappears from the screen
Note: After a reset, you will need to wait several minutes before playing stored music (3 to 20 minutes, depending on how many CDs have been stored). All other sources will be available immediately after the system powers up.
If you have any additional questions about these messages, please contactBose® Technical Support or call 1-800-278-1281.
My display has not been working for years. Replaced c17 cap wich was 33uF 63 volts on lower pcb board( only one on system) . Old cap was good so this was not the problem. Replaced c16 wich was 100uF 25 volts with a 100uF 63volts. Display works, old cap read low. Both c17, and c16 are located on the lower left hand corner of the larger pcb looking from the front of the unit. Hope this helps.