LG H990ds Service Manual page 84

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