In general, the speaker coil lights up in the event of overload or amplifier failure and supplies DC voltage to the output. In general, repairs are not made for low power speakers, but it is more economical to repair expensive high power speakers.
Tools for replacing the speaker coil;
Hobby drill or hand motor
Toluene (used as a solvent, a derivative of the diluent)
Tweezers with fine tip
Radiography Transparent or customs plastic card
Black contact adhesive
A blower or compressor air gun