Chosen Solution
my model is asus vivobook 15, k513e, screen suddenly went blank while i was watching something, i can still change brightness of backlight, but display doesnt output anything, tried reset, hard reset, unplugging the batery, reseating the ram, checked the drivers, i tried updating the bios but cant bcs bios can only put out on main display so i cant even enter the bios, so far there is probably something wrong with a connection but i cant find any videos for this specific laptop or atleast rly similar, dont really know what else i can do
this could be a display issue or an issue with your display connector. Try something this vide to at least get into it. Once you get to the motherboard, take a couple of good pictures of it and post those with your QUESTION. That way we can see what you see. We will also need to know the exact model for your motherboard to see if schematics are available so we can try and check the display connector. Adding images to an existing question