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Hi Apocalipzs,
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With the information supplied, I can advise that this can be removed, simply do the following.
Menu > Settings > Language & Input > Select settings icon beside Xperia Keyboard > Select Sound & Vibrate > Untick Vibration on Keypress.
This will remove the vibrations from the keyboard, however if you continue to have issues with this noise, I suggest that you contact Sony Mobile Customer Care for further help.
I hope this helps.