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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
LGE Internal Use Only
START
NO
YES
Microphone will work
properly.
SETTING : After initialize Agilent 8960, Test GSM850, PCS mode
YES
Check the
Signal Level at each
Side of MIC201.
Is it a few tens
mV AC?
Check the soldering of
L207, L208
NO
Change the microphone
YES
NO
Resolder component
CHECKING FLOW
1. Check mic Bias signal line
2. Change the U103
Check microphone sound hole
Make a phone call,
then check R222 mic bias signal
comes from U103?
(TP1)