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At first, I wasn't sure about the solder balls. Then I realized they were used to anchor the USB and Power Interface pins on the outside of the Headphone to the internal circuit board.

I had to used a solder iron to remove the solder balls, so that the internal interface circuit board could be removed. I had to also remove solder from the speaker wires to free up the internal circuit board.

Internal Circuit Board that interface Power and USB to the Headphones

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