Proximity Sensor And Ambient Light Sensor (Als) - Nokia Lumia 1320 Service Manual

RM-994/ RM-995/ RM-996
BB Troubleshooting Guide

Proximity sensor and ambient light sensor (ALS)

This phone uses a combined proximity and ambient light sensor called Alphamon. The proximity sensor is
integrated to the module and uses an internal LED supplied by VPH_PWR. The current this LED consumes
is controlled by Alphamon and set using software. The interrupt output of Alphamon changes state when
the infra-red light from the LED is reflected back by a suitable reflective surface. The ambient light sensor
detects the level of ambient light and adjusts the display brightness accordingly whenever the display is
active.
Covering this sensor results in dimmed display lights.
Use service software to verify that ALS works. Use a finger to hide the Alphamon sensor window, the light
intensity in mLux changes.
Note: The light intensity could vary depending on how the finger hides the Alphamon window.
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