LG KU800 Service Manual page 117

4. TROUBLE SHOOTING
4.19.2 Voice and Sound Path for Head_set
Voice and Multimedia Sound path for Head_Set as below:
MSM6275 HPH_R, HPH_L → C505 , C506 → R508,R509 → CN503 headset Jack (pin 4,5)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out
and insert headset.
Start
Can you hear the tone?
NO
Sine wave appears at
C505, C506?
NO
Sine wave appears at
R508,R509 ?
NO
Change the Main board
YES
END
YES
Change the Head_Set
YES
Re-solder CN503 (PIN 4,5)
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