Quote:
Originally Posted by soringsm  i fixed this problem.my phone feel down;all ok by mic not working.i find it split c621 on schematic ( C621 --- 2203-006648 c-ceramic chip page 14 on sm) |
physical check mic if damaged replace
check mic ic u609 working voltage on C655
bias in the C656 mic check
check his mic line in R621 and R622
If everything above is still good ... change mic ic U609
See the picture below (position where guide component repair)