LG U8110 Service Manual page 57

3. TECHNICAL BRIEF
Each Voice Uplink Mode paths shown below.
Receiver Mode : C-MIC(OBG-15S44) → TJATTE2 IN (MICP/N) → TJATTE2 OUT
(MICP_INT/MICN_INT) → VICENNE Input(MIC1N/1P)
Loud Speaker Mode : C-MIC(OBG-15S44) → TJATTE2 IN (MICP/N) →
TJATTE2 OUT(MICP_INT/MICN_INT) → VICENNE Input(MIC1N/1P)
Video Telephony Mode : C-MIC(OBG-15S44) → TJATTE2 IN (MICP/N) → TJATTE2 OUT
(MICP_INT/MICN_INT) → VICENNE Input(MIC1N/1P)
Headset Mode : Headset MIC → EARJACK S/W(X2602, Pin Num 2) → TJATTE2 IN(ATMS_CAP)
TJATTE2 OUT (ATMS_INT) VICENNE Input(AUXI1)
When the headset is inserted, GPA6(Circuit Diagram net Name) converted into low state.
So, the headset icon is displayed on Main LCD.
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