People can't hear me, and I can't hear them - Board problem

Hi,

I have iPhone 4, had a water damage, but worked fine for some weeks.

Now the problem is that during a call, you can't hear anything and the people on the other side can't hear you as well.

I took the device, and switched logic boards, and the problem still occurs which means that the problem is on the board.

So.. what part is damaged? How does it call? How to solve it?

Is it worth it?

p.s

I am able to use youtube and hear the sounds of keyboard etc

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