LG L601i Service Manual page 102

4.15.2 Voice and Sound Path for Head_set
Voice and Multimedia Sound path for Head_Set as below:
MSM6250A HPH_R, HPH_L -> C512, C513 -> R506, R507 -> CN502 headset Jack pin 4,5
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
And insert head_Set
When the Head_set is inserted,
The sine wave appear at
Can you hear the tone?
Start
Ear_sense_n pin is low?
YES
R506, R507 ?
YES
YES
END
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4. TROUBLE SHOOTING
NO
Check connector pin and
Head_set soldering point
Or change the Main Board
NO
Change the Main board