Macbook Pro A1502 screen brightness can not be adjusted

www.firstlcd.com/
When I replaced the new Macbook Pro A1502 screen assembly, I found that the brightness could not be adjusted, but after closing the screen, I turned it on again to continue to adjust the brightness.

[@NindeNM]

THANK YOU SO MUCH!!!

[@a.krause790]

Do you know what the problem is now? I have exactly the same problem. Is there a solution to this?

[@overloudlive]

thank you so much

[@psgps3544]

thank you!

[@vcuelectronik]

but how to fix it?