LG -H422 Service Manual page 53

3.11.5 Ear-Mic -Case A
Ear MIC control signals are generate by MT6323(U4100)
Case A. Disable detected headset insert.
Checking Flow
Didn't display headset icon and play
sound via speaker although headset insert
Change Ear Jack
Sound play via
No
Check the left signal and
detection line short when
headset inserted?
MT6323(U4100).
Mic works well?
Change Main Board
LGE Internal Use Only
Start
Yes
Connector.
headset?
No
Yes, but still not works
Change
Yes
No
End
Main
BOT
Ear Jack
Connector
54
3. TROUBLE SHOOTING
Image
Circuit Diagram
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