Lenovo t520 screen going dark

My lenovo t520 just came back from the repair center to get a new motherboard and I have started noticing a weird issue with the screen. Whenever I go on a website that is primarily dark (like the bckground is black), the screen gets quite dark. And then when it goes back to another screen (like where it is priarily white) the screen is alot darker. After a while the screen gets brighter slowly. I checked the brightness controls and they are always on full bightness through this whole thing.
Is there some auto screen brightness efficancy system i do not know of or is my screen just broken?

Reset the NVRAM/PRAM and Reset the SMC, then try again.

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