LG -H422 Service Manual page 56

3.12.2 Proximity Sensor on/off
Proximity Sensor is worked as below
Control the screen's on/off operation automatically
Checking Flow
Start
Send Key click
& Phone number click
& Call connected
Object moved at the
Proximity sensor
LCD off?
No
Check + +2V8_MTK_VIO (C8400)
Output work well?
No
Change the main board
Function is OK?
LGE Internal Use Only
Yes
END
Yes
END
Yes
END
57
3. TROUBLE SHOOTING
Image
Circuit Diagram
Sensor Power: C8400
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