Noise cancelling mic not working

Hey guys and girls!

The noise cancelling mic on the iPhone 4 doesn't work and I don't get any further. Mic is working well on calls and voice recordings, but not on speakerphone or video recording, so it must be the noise cancelling mic. Parts I've changed due to damage just to rule that out:

Lcd and digitizer unit


Front camera

Power button / noise cancelling mic ribbon cable

Home button cable

I hope you have an idea, because I ran out of them in that case :D

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