LG U310 Service Manual page 109

4. TROUBLE SHOOTING
4.17.2 Voice and Sound Path for Head_set
Voice and Multimedia Sound path for Head_Set as below:
MSM6250A HPH_R, HPH_L -> C537, C538 -> R524, R526 -> CN501 headset Jack pin 4,5
Connect the phone to network
Equipment and setup call
Headset insertion detection
in the Main LCD Display OK?
The sine wave appear at
Can you hear the tone?
Start
Setup 1KHz tone out
And insert head_Set
YES
C537,C538 ?
YES
YES
END
NO
Check CN501 pin 8
NO
Check the connector pin
NO
Check the CN501
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