LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.12.2 Voice path for headset
Voice path for Head_Set as below:
MSM6280 HPH_R, HPH_L
→
C548,C549 U502(audio codec)
→
C578,C562
→
R529,C522
→
U504(Headset AMP)
→
FB502, FB503
→
R525, R524
→
#4, #5 pin of CN500 headset Jack
Start
The sine wave appear at
C548,C549 ?
Change the Main board
NO
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
And insert head_Set
The sine wave appear at
C578,C562 ?
YES
Check the U502
or change the Main bíd
NO
Can you hear the tone?
NO
YES
YES
END
Headset insertion detection
in the Main LCD Display OK?
Check #8 pin of CN500
or change the Main bíd
NO
YES
Check the CN500 or change the
Main bíd
The sine wave appear at
R525,R524 ?
YES
Check the U504
or change the Main bíd
NO
Содержание U990
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