One of speakers isn't working

Solution
If you're sure it's the speaker, and not the amplifier, there is an easy way, and hard way, to fix this.
- Easy way: Get new speakers (left and right only, or complete system);
- Hard way: Replace the drivers in the speakers (technically, you could change only the driver in the R speaker, but then they will sound differently).

You can start by opening the speaker, and identifying the size of the drivers.
If you're sure it's the speaker, and not the amplifier, there is an easy way, and hard way, to fix this.
- Easy way: Get new speakers (left and right only, or complete system);
- Hard way: Replace the drivers in the speakers (technically, you could change only the driver in the R speaker, but then they will sound differently).

You can start by opening the speaker, and identifying the size of the drivers.
 
Solution