LG L602i Service Manual page 106

4.16.2 Voice and Sound Path for Head_set
Voice and Multimedia Sound path for Head_Set as below:
MSM6250A HPH_R, HPH_L -> C513, C514 -> R510, R511 -> CN501 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,
Ear_sense_n pin is low?
The sine wave appear at
Can you hear the tone?
Start
NO
YES
NO
R510, R511 ?
YES
YES
END
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4. TROUBLE SHOOTING
Check connector pin and
Head_set soldering point
Or change the Main Board
Change the Main board