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RM-57/58
BB Troubleshooting and Manual Tuning Guide
Nokia Customer Care
Display and keyboard backlight troubleshooting
Context
The device has one LED driver that provides current for both display and keyboard backlights.
Keyboard backlights are turned ON only in dark conditions. This is controlled by the Ambient Light Sensor (ALS).
Also the brightness of the display is adjusted by the ambient light sensor.
You can enable/disable ALS with the help of Phoenix service software.
Display brightness can be adjusted manually, if ALS is disabled. If the ambient light sensor is enabled, it adjusts
the display brightness automatically.
Issue 1
Company Confidential
Page 6–37
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