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I have a wireless bluetooth earphone, on which the left driver plays at half volume. I want to cut off the drivers and solder in a mmcx connector so that I can have options on the drivers. However assuming the color coding isn't standard or nonexistent, how do I detect the ground and signal wires without an option of doing a continuity test against 3.5mm jack ?

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There may not be a ground if the drivers operate fully bridged (wikipedia: h-bridge).

A shorted transistor on a h-bridge leg would also nicely explain a half volume output level.

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  • \$\begingroup\$ so how to ensure the new connection won't make drivers play out of phase ? The electronics and battery are pretty well sealed, and me clumsily cracking them open might compromise the sweatproofing. \$\endgroup\$ Commented Feb 10, 2018 at 10:18

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