Resurrected, whooshing sound when recording

Hi guys, i have just repaired an iphone 6 that wouldn't turn on by replacing the CHARGE IC.

Now it works well, but when i test the mic with the "voice memos", there's a very loud whooshing sound in background, same problem replacing AUDIO IC U0900 with a new one. i've also tried a new dock but the problem was the same.

What i should do now?

Thanks