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1. Replacement screen has bad LED diode (not likely the problem).
2. Either you didn't get cable securely attached to replacement screen or (more likely) the other end of the cable detached from the motherboard when the computer fell and the original screen broke. I recommend carefully rechecking both ends of the cable connection.
what your trying to attempt is not an easy fix to do if you havent done it before, you need to remove all screws holding the laptop together to include the screen anchor points found in the rear of the laptop, then you have to remove the wires connecting the screen to the motherboard (which are small and have a fragile little connector and are also in a grove to keep them in place) if you once you have done this you now can connect your new screen in reverse fashion, go slow dont force anything and be patient
I had a similar problem, but I got a picture before it broke up and went off. The screen was backlit, but no video (screen was receiving some power).
The LCD needs a very stable voltage to work, this is provided through the LCD connector ribbon. In my case the ribbon was damaged and replaced it.
I have had no problem since.
I discovered this through trial and error; I first changed my transformer power supply and then the video inverter card.
You may find the link below helpful as it contains articles that photographically show you how to open the laptop for repairs.