Hi @ozueun,
Try connecting an external monitor (TV?) to the laptop's HDMI port and check if it is turning on but just with no laptop display. Press Fn + F8 (both together) to toggle the display between the laptop only, external monitor only or both on together.
If there is a display on the external monitor there's a backlight problem with the laptop's display.
If you can't connect to a monitor then try shining a flashlight at an angle close to the laptop screen and check for any images.
They will be very faint if they are there so trying in a darkened room may help to see them.