LG KU950 Service Manual page 120

4.17.2. Voice and sound path for headset
Voice and Multimedia Sound path for Head_Set as below:
MSM6275A HPH_R, HPH_L → C709,C710 near the U701 (audio codec) → C719, C732 near the
U703 ( Headphone AMP ) → FB702, FB704 → R709,R712 → #4, #5 pin of CN601 headset Jack
Connect the phone to network
Start
Equipment and setup call
Setup 1KHz tone out
And insert head_Set
Headset insertion detection
in the Main LCD Display OK?
YES
The sine wave appear at
C709,C710 ?
YES
The sine wave appear at
C719,C732 ?
YES
Can you hear the tone?
YES
END
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4. TROUBLE SHOOTING
NO
Check #8 pin of CN601
or change the Main b'd
NO
Change the Main board
NO
Check the U701
or change the Main b'd
NO
Check the CN601 and U703
or change the Main b'd