If the left ear of your BOSE noise-cancelling headphones won't charge, there may be several possible causes and solutions:
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1. Make sure the charging connection is correct: check whether the charging cable and the headset connection are clean, and whether the plug is correctly inserted and firmly connected. Sometimes, the plug may not be fully inserted or the connection may be loose, resulting in unsuccessful charging.
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2. Check the charging cable and adapter: Make sure that the charging cable and adapter used are working properly. If possible, try to use other charging cables and adapters to rule out the possibility of damaged charging cables or adapters.
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3. Charging interface or headset failure: If there is no problem with the charging cable and adapter, it may be that the charging interface or battery of the headset itself is faulty. In this case, it is recommended to contact BOSE Customer Service or an authorized repair center for repair and diagnosis.
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Please note that the above advice is only a basic troubleshooting step and will not solve all problems. If the problem persists, it is best to contact BOSE customer service or an authorized repair center for more professional help and solutions.
The left earphone should be faulty. It is recommended to check the charging module of the left earphone for real-time maintenance.