Why is my device not displaying any video but touch works

I recently purchased an iPhone xr and the screen was damaged and not working, after purchasing one screen replacement the display and touch would not work, purchased another replacement screen and touch works but no display, so either I have bad luck or something is wrong. Been doing extensive research and some say the pins may be bent on the board but im not seeing a single bent pin on the board

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where did you buy your screens from? Also did you disconnect the battery while repairing the screen?