Vertical artifacts after replacing display

I had a broken digitizer and tried to replace the screen (LCD+digitizer)

So cable connected and tested -> Working

Glue added, cable reconnected and slightly pressed on glue while trying to get that cable to bend the right way. When everything was in place, I tested the display again and found suddenly vertical lines extending from bright (e.g. white) elements shown over the whole height of the display.

This now happened twice to me and I can't figure out, what I may have done wrong.

Any ideas?

Start:

Block Image

Kinda invisible:

Block Image

After boot

Block Image

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Double check the connection and the ribbon cable to the LCD itself, it may have become damaged.

My guess is the ribbon cable directly coming from the screen somehow got damaged during installation.

That looks like ribbon cable damage / bad connection.

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Visually inspected but nothing found there. Very strange

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