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8. Level 3 Repair
8-4-11. Proximity/Ambient Light sensor
Pro Ambient Light Sensor does not work
Yes
No
Yes
No
Check the voltage
L4100, C4101 =3.3V
No
Replace U9014
Check the voltage
L4101, L4102, C4103, C4105
=1.8V
Yes
No
No
Replace U7001
Check U4100
’s package, smd status
(crack, open, short, etc.)
No
Yes
No
Replace U4100
Yes
No
END
Check U4101
’s package, smd status
(crack, open, short, etc.)
No
Replace U4101
Check R5027, R5029
(I2C is OK?)
No
Yes
No
Replace U4100,U4101
(If there is still problem, replace UCP500)