LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 79 -
START
NO
YES
Microphone will work
properly.
SETTING : After initialize Agilent 8960, Test GSM900, DCS, PCS mode
YES
Check the signal Level at TP2
of MIC300. Is it a few tens mV
AC?
Check the soldering of
TP6
Make a phone call,
then check TP1 mic bias signal
comes from U103?
NO
Change the microphone
YES
NO
Resolder component
Change the U103
Check microphone sound hole
Does waveform at TP3
fluctuate?
NO
Resolder component
YES
Does waveform at TP4
fluctuate?
NO
Are the TP5 LOW?
NO
Change the U103
YES
Change the U301
YES
To Next Page
Loading...
