In above diagram red color line is identifying an IC that is used in sim function.After dis assembly of Nokia C5-03 check this IC and its near by area.
If you found some rust carbon or water damages then it can also be cause of Nokia C5-03 insert sim problem to solve and fix insert sim problem in Nokia C5-03 clean all the rust and carbon with electronics cleaner and apply hot air to make it dry.
Re sold or Re flow this Ic and if resolding can not solve insert sim problem in Nokia C5-03 then replace this IC.
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