LG -E450 Service Manual page 145

4.8.6 Ear-Mic Trouble Shooting
Ear MIC control signals are generate by MT6575(U200)
Case A. Disable detected headset insert.
LGE Internal Use Only
START
Didn't display headset icon and play sound via
speaker although headset insert
Change Ear Jack Connector.
Sound play via headset?
No
Check the left signal and detection line short
when headset inserted?
Change MT6575(U200).
Mic works well?
Change Main Board
END
Yes
No
Yes
Yes
No
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4. TROUBLE SHOOTING
Only for training and service purposes