The brick bug results in sleep light on when powered up and nothing else. No chime, no bootscreen commands, no screen, no nothing. Turns on it's light.
The T2 crash bug results in the computer not powering on. Just sits there.
So it's not either of those!
It could be display backlight, display itself, display cable, or fault on the logic board. Some of the 1st post-Jobs machines (2013 and newer) went cheap on logic board builds and the display going black is one of the failures. It's a chip on the logic board. Don't buy another one, it will just do the same. They had a run of bad display cables on a couple models in this period as well. I stopped doing the after marker repairs I was doing at this point. No post-Jobs Macs! No exceptions! They're soldering in hard drives now to make the new machines disposable.
If your machine is in the 2009-2012 range, it could likely be fixed reasonably. If you have one of the fast quad i7 machines that does some heavy lifting it might well be worth it to fix.