Chosen Solution
Before this problem, it was working properly. But now right sound fron right earphone gives good sound.but in left there is less sound and no stereo effect . There may be Hardware problem.
The Wire that goes into the earphone is probably twisted up so bad one of the two audio wires + and - has snapped or are shorting out on eachother. unless they are wireless and in that case you can disregard my answer!
