in above diagram you can see a red line that identify parts used in wifi function in Nokia Asha 311.So after disassemble of mobile phone look all these parts very carefully and if there is some rust or water damages clean them with electronics cleaner and apply smoth heat with hot air. do not apply to much air because it can harm your skin and also can damage the mother board.
So re flow resold these parts and if it can not solve problem replace these parts that are given in above diagram.
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