If you are getting sound out of only one speaker then it is possible the speaker not putting out any sound is either defective or one of the speaker wires is broken. Before trying to repair a broken wire or replace the speaker, try plugging a set of earphones into the tablet and check if you are getting normal sound out of them. If you are not, try playing an alternate music source like a music file stored on your tablet or an internet radio station. If you still do not have normal sound in both ear pieces then you most likely have an internal problem with the tablet sound system that you probably need to have a profession repairman look at. If you do have normal sound then the issue is with your speaker and you could try to repair it yourself.