My Macbook Pro adjust the light and type the keyboard itself, what should I do !!!

My Macbook Pro went overheat after I left it rendering the 3D scene overnight.
Now, it adjust the light and type the keyboard itself without doing anything.
So, I connect it to the new keyboard, it works.
However, the light still adjust itself. What should I do?

I need to use my computer to paint and do many stuffs, like graphic design, animations, etc.
It is very hard to work with the computer that adjust the light itself like this.

Please help ...