Here's a full solution for Nokia E72 with a not working keypad backlight problem. This solution may possibly help if the keypad LED's doesn't light up.
This solution shows the connection of the keypad backlight LED driver chip fro deeper and further check up procedures. This following solution also includes the entire keypad circuit of Nokia E72 which is very useful in troubleshooting backlight problem on the device.
If all the keypad LED's does not light up or glow, you may then consider that the problem lies on a faulty LED driver IC. By reworking or replacing it might only fix and repair Nokia E72 keypad back light problem The keypad backlight LED's has an individual connection line paths, you may need to check and trace each certain connection if only one or two and not all of the LED's are not working.
This solution shows the connection of the keypad backlight LED driver chip fro deeper and further check up procedures. This following solution also includes the entire keypad circuit of Nokia E72 which is very useful in troubleshooting backlight problem on the device.
Nokia E72 Keypad backlight LED Problem solution
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