LG GB115 Service Manual page 58

Checking Flow
Check Voltage Level of
TP1 VMIC = 2.5V ?
Check Component
status around Mic
Check status of MIC
Replace U101(EGV) or
Change PCB
Start
Make a Call
YES
YES
OK
OK
NO
Replace U101(EGV)
NG
Re-solder or Replace
Component
NG
Re-solder or replace
Microphone
58