Display And Keyboard Backlight Troubleshooting - Nokia RM-42 Service Manual

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BB Troubleshooting and Manual Tuning Guide

Display and keyboard backlight troubleshooting

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.

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