LG GM200 Service Manual page 103

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