Fault Details: iphone 3g wifi not working problem, low wifi signal problem.
Solution: We can solve wifi related problem in iphone 3g in many ways.
  1. Restore or update mobile software.
  2. Check antina points on motherboard.
  3. By changing wifi ic. 
Here is a diagram in which wifi components are showned replace these two white components.
iphone 3g wifi not working problem
iphone 3g wifi not working problem solution diagram, in which wifi component traced.

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