Ear-Mic Headset Mic Trouble Shooting - LG KE590 Service Manual

4.15 Ear-Mic Headset MIC Trouble Shooting

Disassemble the rear case of phone.
Connect the Ear-Mic Headset
to the Ear-Mic Socket of phone.
Check Soldering of R306,R307
C303,C305,C306,C311,C312,L301,
VA301 Is it O.K?
Check the status of R306.
Is itís voltage 2.5V?
Check the soldering Pin #2
U103(ABB) is broken.
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START
YES
YES
of CN301
YES
Change the board.
4. TROUBLE SHOOTING
NO
Re-solder
R306,R307
C303,C305,C306,C311,C312,
L301,VA301
NO
U103(ABB) is broken.
Change the board.
NO
Resolder Pin #2 of CN301
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