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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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CHECKING FLOW
START
Replace U101 or Change the board
Voltage MICBIAS of U101
= 2.0V?
Check the Solder
condition of R214 and
C222,C224
Re-solder or replace the Component
Yes
No
Yes
No
Microphone will work
properly.
Check the signal level at
MICP.
Is it about 1.2~1.5V?
Re-solder or replace the microphone
Yes
No