After dis assemble of Nokia C5-03 look at mother board and If you found some rust carbon or water damages then it can also be cause of Nokia C5-03 USB problem to solve and fix USB problem in Nokia C5-03 clean all the rust and carbon with electronics cleaner and apply hot air to make it dry.
In above diagram some different color lines are given to identify paths and tracks that are used for usb charging and usb data transfer in Nokia C5-03.Check all these paths tracks and parts components with meter. If any of them is missing apply jumpers as given in diagram.
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