Lines on screen after replacement

I just installed a new display on my iPhone SE 1st gen, purchased here with the tools, according to the instructions on this page, and after turning on the phone, lines appeared. What else could be the problem if everything is connected well and the display is new? Thank you.

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crwdns2889612:0crwdne2889612:0 0

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What was the original issue you replaced the screen for? Is the issue the same now with the new screen?

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