Ear Speaker not working because of faulty board?

Hi guys,

I'm clueless with the 4s. I replaced the earspeaker and still got no sound. Pulled the plunges a bit and cleaned the contacts on board with Iso 100%. No succes.

So I tested the logicboard on my good device and no sound too.

So it must be the board. But what? Does anyone have a clue which resistor is responsible for that?

any help is appreciated