Earpiece/Mouthpiece issues with HTC One M8

[Android Central Question]

The audio works perfectly when listening to music or using speakerphone. However, when making a normal call, I only hear a little bit of static and no audio whatsoever. Also, the mouthpiece doesn't work. Yet doesn't sound come out of it as well? Why is it that during a call, the mouth/ear Components don't work, but for all other audio they work flawlessly?

 

[Golfdriver97]

Welcome to the forums. Different circuit path perhaps?