This solution is for Chinese N82 Touch Screen problem. Again this solution is not for original Nokia N82 but for the Chinese replica.
Touch screens in most of the Chinese mobile phones are pretty fragile and useless so it should not come as a shock if yours start to fail after a while. Since finding China mobile spare parts is not easy if your phones LCD is working but touch stop working check the marked parts as shown in this diagram and your phone will be good to go.
Here is China N82 touch screen calibration failed problem solution. Please study these diagrams very carefully before you start repairing.

If you have further questions please don’t hesitate to leave a comment.
Note: Every repairing solution posted here is tested by at least one member of our team. Use the information available here at Your Own Risk. We are not responsible if any harm comes to your device during the repairing process.