Problem: Nokia 1616 not working problem, mic point on circuit damage problem.
Solution:- Mic problem in nokia is not big issue, we can solve this problem by follow the simple method.
First confirm that mic hole on mobile casing not close, then disassemble mobile and replace mic with new one.
If mic gives continuity then check circuit and check mic points on motherboard, if any point damage then apply jumpers like diagram below diagram.
Nokia 1616 Mic Not Working