LG -D618 Service Manual page 92

3.9.5.2 Headset Mic. trouble
Ear-Mic. path as below :
MSM8226 -> WCD9302 HPH_L / HPH_R -> Headset
START
Headphone icon display on Upper
right LCD ?
Yes
Replace Headset Jack (J6600)
Check Main Board
TP1(MIC)
When headset inserted.
Replace component FB6600
Replace component U6100
End
LGE Internal Use Only
Yes
No
No
Yes
No
Yes Yes
Replace component R6616, C6611
No
End
Check Main Board
TP2(MIC_IN2_N) is GND level?
No
No
- 92 - Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
Yes
Replace component U6100
Only for training and service purposes