troubleshooting
check here first
If your phone does not seem to work properly, read this page first.
when the backlight is turned off, it can seem like your phone isn’t working
Question: My phone does not turn on when I press the keys, but I know the battery is good.
Answer: If the backlight set to off, it might appear as if the phone is not working. Check the backlight setting.
Find it: M > Settings > Initial Setup
>Backlight
no display
Question: Why can’t I see the display when I use my phone? I know the battery is good.
Answer: The backlight may be set to off. Check the backlight setting.
Find it: M > Settings > Initial Setup
>Backlight