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samsung galaxy a70 screen going off and on

my samsung galaxy recently fell and the screen went blank , i brought it to a tech n he said the screen went bad , i changed it but i bought the wrong screen , instead of the amoled display i got a tft display instead , ive noticed when i use the phone or even try to unlock it the screen goes blank but i can tell the screen is on , after a few second it flickers and starts displaying again , is this a hardware issue , software or has the motherboard taken some damage from being dropped from about knee height on the screen .......... help