N80 keypad backlight problem

Hi
I've got problem with my Nokia N80
The backlight of the "down" keypads (buttons: 1234567890*#) doesn't works. I am not the first owner of the phone, and I am not sure what is the problem, but I'm sure that the phone never felt down in water or something else.
There is backlight only in two cases:
-when the phone get start, there is backlight in these keypads, until the Nokia ring and the logo with the two hands shows - then the backlight disappear;
-when the phone is in SILENT mode without neither vibration, nor rings; if there is an incoming call and if the phone is "opened" - all backlights is blinking (including the "down" keypads).
Any advice? Maybe the light senzor is broken, or maybe softwear bug (when i bought it, was with soft. ver.: 3.0617.0.6, then I update it to 5.0719.0.2, but the problem doesnt fix).
Thanks in advance.

Just try to reset the factory settings to default.
A soft reset:*#7780#.
If it still occurs, then visit a nokia care:
Care points:
UK
http://www.nokia.co.uk/A4228006
Europe:
http://europe.nokia.com/A4388379
Elsewhere:
http://www.nokia.com and select your country.

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N80 keypad backlight problem

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