Keyboard backlit doesn't work

Hi, I have 2011 MBP, I've replaced it's RAM and keyboard backlit is not working anymore.
I've replaced it back and it doesn't work again, tried shading the sensor, it doesn't help eather, moreover the keyboard illumination settings are gone, and I guess the system doesn't recognize the hardware. I've installed Lab Tick and it doesn't make sense.
What can I do to have it back? Please help.

Problem solved. Just plug the power then everything goes fine.

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