How to Replace a Dead or Faulty Left or Right Main Board on the Bose QuietComfort (QC) Ultra (DIY Repair Guide)
Do your Bose QuietComfort (QC) Ultra wireless headphones refuse to power on, overheat during charging, or switch off unexpectedly despite having a good battery? Do Bluetooth connections drop or the headphones lose wireless functionality altogether? If you’re experiencing any of these issues, replacing the main board may restore stable functionality.