LG L240 Service Manual page 79

4. TROUBLE SHOOTING
z MIC Trouble
START
Voltage across Rxxx
is about 2.5V?
YES
Check the signal
level at each side of MIC301.
Is it a few tens mVAC?
YES
Check the soldering of
Rxxx,Rxxx,Cxxx,Cxxx
change the Main Board
END
NO
MICBIAS Voltage of U101
is about 2.5V?
Re-solder Rxxx &
Rxxx
NO
Replace
MIC301
NO
Replace U101
- 80 -
NO
Replace U101