after dis assambling of Nokia 5250 check touch screen jack on board if there is some carbon or water damage then clean it with electronics cleaner and apply a light heat with hot air so that it can be dry.once its totally dry check touch screen.
if touch screen of Nokia 5250 will not be solve with above method check all track and parts as shown in above diagram.in diagram all tracks are given with different colors and you can easily find whole track and path.
if any path is damage or broken apply jumpers as shown and replace parts as given in diagram.
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