Where is the back light settings in Nokia N70 and other higher end Nokia phones?

I did a lot of google search for the Nokia N70 backlight problem. Many people are facing this problem. Under setting>>Phone>>Display>> you don't have an option to switch it ON of Switch it OFF. Of course, it may not be absolutely required.
Another problem with backlight is time out delay. I found a thread in Nokia Forum stating the time out is happening after +30 seconds. Meaning, if you set it for 10 seconds the timeout happens after 40 seconds(10+30)
If anybody found a way to switch on/off backlight please inform in the comment section

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