Did you disconnect the battery before you removed the screen? .you could have damaged the back light circuit. Look and see if you can see anything is a darker room and shine a light on the screen. And see if you can see anything.
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=== Update (06/11/2020) ===
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It sounds like you might have blown a filter on the back light circuit. You should pull the board out and check the circuit. Or if this is out of you skills take it to a repair shop. You will most likely need do microsolder work.
Did you disconnect the battery before you removed the screen? .you could have damaged the back light circuit. Look and see if you can see anything is a darker room and shine a light on the screen. And see if you can see anything.