crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 Spag Tortellini

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My noise cancellation is making a high pitched noise

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Hello, I recently changed the battery of my headphones. Ever since then, my headphones have been playing this high pitched noise that only disappears when I turn off ANC. I think I messed up my battery repair by getting something too hot and I would like to know what part I would need to replace to get rid of this noise. Any advice would be greatly appreciated!

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Bose Quiet Comfort 35 II

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open