NC 700 right side no sound, Bose won’t repair

1.5 year ago I bought the bose NC 700. Today, suddenly the right side stopped working.

Updating the firmware, and switching to other devices didn’t change it. The noise cancelling also doesn’t work on the right side. I found similar problems online, there they said it was likely a hardware issue.

I contacted local Bose support, they told me the don’t do repairs on headphones. I need to buy new ones since it’s outside warranty… Probably designed for obsolescence, great stuff for these very expensive headphones.

Anyone has some advice how to try to repair?

Thank you for the advice!

I found all the ‘security’ torx screws and removed them to uncover the main speakers, the battery and the circuit boards on both sides. If anyone also want’s to do this, remove ALL cloth not only the cushions. The cable from the main speaker to the PCB is indeed a finicky connection, but it wasn’t the problem.

I was able to test the problem by switching the speakers from left to right and vice versa. The original right speaker didn’t work in the left side. And the original left speaker did work in the right side. So it seems the right speaker is just broken. Unfortunately this part is ‘plastic' welded’ shut and I couldn’t continue my teardown. I searched online to find replacement parts (there were serial numbers that I used to search), unfortunately Bose does not support any repairs on headphones.

Only solution I had was to buy a second pair of broken headphones and use these for parts.

I hope someone will have some useful info from this.