LG KG920 Service Manual page 126

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CHECKING FLOW
SETTING : After initialize Agilent 8960, Test EGSM, DCS mode
Put the sound source near The MIC. And Connect the Mobile.
START
Voltage VMIC of U100
= DC 2.5V?
Yes
Check the Solder
condition of R416 and
R419, R421, R422,
R435, C422
Yes
Check the connection and
Solder condition of CN700
and CN101(Key)
Yes
Check the condition of
Main FPCB.
Yes
Yes
Microphone will work
properly.
No
Replace U100 or Change the board
No
Re-solder or replace the Component
No
Re-solder or assemble CN700 or CN101(Key)
No
Replace Main FPCB
No
Re-solder or replace the microphone
Figure 4-95.
- 127 -
4. TROUBLE SHOOTING

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