The backlight on the display of my MacBook Pro 15 retina early 2013.
I have tried to make it brighter by pressing F2 but it didn't work, and when I bring a light from the back of the display exactly near the Apple logo I can see my login screen.
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You can try to reset the SMC by following the steps here.
If that doesn't work it looks like your backlight is broken, and you should ask for a replacement if you still have Apple Care.