Earspeaker/Loudspeaker not working after screen and battery replaced?

Greetings,

I replaced my lcd display and battery recently but now I have no sound coming from the earspeaker and loudspeaker. The proximity sensor works just fine on my phone, but I can't hear anything.

No sound at all from the loudspeaker nor earspeaker. Any suggestions as to what may have caused my phone to be mute? It works if I use my headphones. I cleaned out the headphone port as well, so I dont think this is a problem with the headphone port, making it stuck in headphone mode.

Would replacing the headphone assembly fix my problem, or replacing the whole dock assembly do the trick? Any suggestions would be much appreciated. Thanks!