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Constellation

Galaxy A51 - Fingerprint scanner not working

I recently changed the display on my samsung galaxy a51, as the old one was broken. I did the procedure myself, removing all of the components of the device and then putting them back on the new display. Everything worked fine, but when I tried to register my fingerprint, it came up with the message, "make sure to adjust your finger position slightly each time" it recognized that I put my finger on the sensor, as the sensor glowed green when I placed my finger on it, but Icouldn't get a single scan. Didn't even go up 1%. After a couple of times, it canceled the scanning. I know how to add my fingerprint, so I am not the problem. Please help.