To see it it's a board-level issue, try connecting an external monitor to your laptop. Use a function key to toggle between the external monitor and your laptop's display. If the external monitor works, then it's not a board-level issue; it may be the laptop's LCD assembly. Fix it by first replacing the laptop's display inverter, then replacing the LCD panel. It's usually best practice to try the cheaper solutions first.
If neither display works, then it's probably a board-level issue. I agree with oldturkey03; it's best to confirm the motherboard type. However, these links may also be useful:
Laptop User Guide:
[link|https://download.lenovo.com/consumer/mobiles_pub/ideapad5_ug_en_202001.pdf?linkTrack=PSP:ProductInfo:UserGuide|https://download.lenovo.com/consumer/mobiles_pub/ideapad5_ug_en_202001.pdf?linkTrack=PSP:ProductInfo:UserGuide|new_window=true]
Laptop Parts (enter the serial number for your laptop to see a list of the specific parts installed):
[link|https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/5-series/5-15iil05/parts|https://pcsupport.lenovo.com/us/en/products/laptops-and-netbooks/5-series/5-15iil05/parts|new_window=true]