The back, home and menu buttons are not lit but they work. How can I make them backlit again?
I have an ALCATEL ONETOUCH IDOL 2plus
Thanks and regards
Please check through these steps.


Just reboot and see whether it functions or not.
Goto recovery mode and clear cache data and check. 
Do a factory reset and check. 


After all these if no response, it may be a hardware issue, take the device to manufacturer's service center and check.