Sony XPERIA ST27i Troubleshooting Manual page 29

Problem Areas: Ambient Light Sensor
3. If damaged – replace the Bracket Proximity Sensor.
Check:
Inspect the Ambient Light Sensor on the Main PBA.
Action:
1. If dirty – clean it.
2. Replace board.
1265-6294 Rev 4
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Troubleshooting Guide (mech)
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