LG D405 Service Manual page 84

3.9.5 Ear-MIC troubleshooting
3.9.5.1 Headset Sound 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(EAR_SENSE_JACK)
When headset inserted change High
-> Low?
Replace component U6420
End
LGE Internal Use Only
Yes
No
No
Yes
TP2(HPH_L), TP3(HPH_R), TP4(HPH_
No
Replace component U6100
Replace component U2100
Yes
Check Main Board
REF)
No
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3. TROUBLE SHOOTING
Check Main Board
TP5(-NCP_VNEG), TP6(NPC_C1P)
No
Replace component U6100
Only for training and service purposes
Yes