the touch screen of my N9 became partially insensitive: like a thin line from the left to right of the screen. It's very hard to type letters there or swipe something from the bottom to the top.

Is there a tool or a setting for calibration or is it possible to change the sensitivity? Maybe it'll react then.

Is it true, that this can happen with cheap chargers?

I can't afford a new touch screen (wich costs about as much as a used N9) Is it possible to repair a touch glass?


pls help