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4.13 Ear-Mic Headset MIC Trouble Shooting
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
U100(ABB) is broken.
Change the board.
NO
YES
NO
Re-solder
L100,C111, C306,C307,
C308,VA300,R303,R304, L302
NO
Disassemble the rear case of phone.
Connect the Ear-Mic Headset
to the Ear-Mic Socket of phone.
Check Soldering of L100,C111,
C306,C307, C308,VA300,R303,R304
L302 Is it O.K?
Check the status of R303.
Is itís voltage 2.5V?
Check the soldering Pin #2
of CN300
U100(ABB) is broken.
Change the board.
YES
START
Resolder Pin #2 of CN300
YES
R304
R303
L
302
C306
C308
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