LG D405 Service Manual page 86

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 (J6610)
Check Main Board
TP1(R6616)
When headset inserted change High
-> Low?
Replace component U6100
End
R6105
EAR_SENSE_JACK
LGE Internal Use Only
Yes
No
No
Yes
TP2(MIC_IN2_N) is GND level?
No
Replace component R6616, C6614
20K
0.01
Pin 18(GND) should have
a dedicated via to main GND.
TP1(R6105)
Yes
Check Main Board
No
C6103
0.1 10V
C6106 0.1u
- 86 - Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
Replace component U6100
37
MBHC_HSDET
22
1u
CCOMP
WCD9302
34
LDO_HI_CAP
Only for training and service purposes
U6100