In above diagram you can see touch pad jack and a few different color lines in it. In first step try calibration to solve touch screen problem if touch screen touch positions are not correct.
If touch screen is totally not working you can replace with new one and if replacement of touch screen is not working that can be problem of touch pad ways.
In above diagram you can see touch pad tracks so check all these paths with meter and if any of them is missing apply jumpers as given in repairing diagram for Nokia Asha 303 touch screen.
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