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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4.13.2 Voice path for headset
Voice path for Head_Set as below:
MSM6280 HPH_R, HPH_L
→
C412,C416 U400(audio codec)
→
C444, C458
→
R413, R420
→
U404(Headset AMP)
→
FB404, FB405
→
R415, R417
→
#4, #5 pin of CN501 headset Jack
Start
The sine wave appear at
C412, C416 ?
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
C444, C458 ?
YES
Check t he U400
or ch ang e th e Main b' d
NO
Can you hear th e tone?
NO
YES
YES
END
Headse t insertion detec tion
in the Main LCD Di splay OK?
Check #8 pin o f CN501
or ch ang e the M ain b'd
NO
YES
Check t he CN501 or change
the Main bíd
The sine wave appear at
R415, R417 ?
YES
Check t he U404
or ch ang e th e Main b'd
NO