Samsung SM-F711B Service Manual page 213

6-6. Sensor
6-6-6. Proximity/Light Sensor Problem
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5. Check 'Capacitor' nearby 'U4013'
on the PBA as below.
- VDD_PROXY_LED_3P3=3.3V (Ref. C4075)
6. Check its 'Power Level' is OK
when it turned on.
- If not, replace U9004.
7. Check 'Sensor IC' 'U4013'
on the PBA as below.
- crack, open, short, etc.
8. If it has a problem, replace U4013.
9. Check 'Resistors' nearby 'U4013'
on the PBA as below.
- I2C signal
(Ref. R5055,R5057)
10. If it has no signal, replace PBA
11. If not, Exchange the PBA
with new one and check the device.
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