LG -P768 Service Manual page 85

4.11.5 Ear-MIC troubleshooting
Ear MIC control signal is generate by TWL6040 and OMAP4430.
- Disable to recognize headset insert
Ear Conn
LGE Internal Use Only
START
Check the 3.5pi headest FPCB
BtoB connector or change that FPCB
to new one.
No
Check the left signal and
detectionline became short when
headset inserted (TP1)
No
END
END
TP1
EAR MIC
GND
EAR_R
EAR_L
L_Detect
Yes
END
Yes
Change the P-channel MOCFET
Yes
Detecting headset insert well?
No
Yes
Change the TWL6040.
Detecting headset insert well?
No
Change the mainboard
Check the left signal and detection signal that be
shorted when headset inserted, also confirm Ear MIC
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4. TROUBLE SHOOTING
Signal, HIGH
Only for training and service purposes