My laptop screen is not working but when i plugged in to external monitor the desktop shows. all components are working correctly, and the gpu also works. This suddenly happened when my phone dropped flat at the laptop keyboard. What do you think is the problem component here?
Phone dropping on keys may have turned laptop screen off, which is common feature on many laptops.
It's usually one of the dual function keys on top row in conjuction with the Fn key. Look for key on top or second row with screen icon on it.