Problems
-No sound in S4 speakers.
-Low sound in S4 speakers.
.Distorted Sound.
Hardware Solution

.Remove and re-plug speaker strip.
.Check connection between 2 coils and on-board speaker connector (2nd and 3rd Pin). If any .of the coils are faulty, replace them.

.Reheat Audio IC. If it is still not working then replace it.
-No sound in S4 speakers.
-Low sound in S4 speakers.
.Distorted Sound.
Hardware Solution

.Remove and re-plug speaker strip.
.Check connection between 2 coils and on-board speaker connector (2nd and 3rd Pin). If any .of the coils are faulty, replace them.

.Reheat Audio IC. If it is still not working then replace it.