LG -A230 Service Manual page 95

CHECKING FLOW
SETTING : After initialize Agilent 8960, Test EGSM900, DCS mode ( or GSM850, PCS mode )
Check microphone sound hole
Make a phone call,
then check R529(TP02) mic bias
comes from U101?
Check the signal
Level at each side of MIC200.
Check the soldering of
Microphone will work
LGE Internal Use Only
START
YES
Is it a few tens
mV AC?
YES
VA203,VA204
(TP06,05)
YES
properly.
NO
1. Check mic Bias signal line
2. Change the U101
NO
Change the microphone
NO
Re-solder component
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4. TROUBLE SHOOTING
Only for training and service purposes