LG LG-D855 - Ear-MIC Trouble Shooting; Unable Detection of Headset Insert

3. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
START
Didn’t display headset icon and did play sound via
speaker although headset insert
End
Check PCB.
EAR JACK Linle TP17,TP18 headset?
Change Main Board
1. Check the left signal and detection line short
when headset inserted?
No
No
Yes
Yes
3.13.7 Ear-MIC Trouble Shooting
Ear MIC control signals are generate by MSM8974AC(U2100), WCD9320(U6100)
Case A. Unable detection of headset insert.