Tried various fixes I found online for the same problem with my LG Stylo2. This is what worked for me....Remove the back cover of your phone and push on the speaker (left bottom) a few times. All of a sudden I have sound again. Loose wire likely cause inside speaker!! Hope this works for you.

Tried various fixes I found online for the same problem with my LG Stylo2. This is what worked for me....Remove the back cover of your phone and push on the speaker (left bottom) a few times. All of a sudden I have sound again. Loose wire likely cause inside speaker!! Hope this works for you.