LG H990ds - Proximity Sensor Troubleshooting (Case 2)

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3. TROUBLE SHOOTING
When LCD ON/OFF is not working automatically check proximity sensor.
3.16.1 Sensor – Proximity(case2)
Circuit Diagram
No
START
Send Key click & phone
number click & Call
connected
LCD ON/OFF?
Check
+3V0_VREG_L18A
(TP1)
Change main PCB
YES
No
Output work well?
Yes
Object moved at the
Proximity sensor
END
END
YES
Output work well?
END
No
TOP
TP1(C8401)
TP1(C8401)
Image Checking Flow
84