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A pair of wireless noise-cancelling over ear headphones released in 2022 by Sennheiser.

Left earcup suddenly stopped working

The left earcup of my Momentum 4 suddenly stopped working. Did anyone had this issue? If so, what was the fix?

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I recently have the similar problem. As was discovered the left speaker wire is damaged inside the joint/swivel. If I move/rotate the left earcup a bit the sound became available for a moment.
For now I didn't realize how to disassemble the joint/swivel to replace the wire.

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Mandbra will be eternally grateful.
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