Dear @Alex.A,
today I finally gave the modemfiles a try, and they solved it! My FP2 does now recognize the new screen! Everything is finally working the way it should, amazing! 
Thank you very much!!!
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The touch screen of my fairphone 2 does not work in one part: With the drawing tool from the service checkup it becomes obvoius which part of the screen does not get any touch signals: a column that is (holding the phone in portrait mode) 1cm wide, and 1 cm distant from the right screen border. If i type “i” on the keyboard, it makes “uo”. For now I can write text only in landscape mode.
Is there any possibility I can fix this without replacing the screen?
You can try to remove the screen, clean the contacts, and reassemble it again.
I’m not sure, whether the touchscreen function is connected in a kind of matrix, like keyboards, but if it doesn’t help, it should not do any harm either.
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Thanks for the advise. I carefully cleaned the contacts with rubber (eraser), but sadly its still the same problem. Didn’t work for me.
Is there a Fairphone angle or a meeting nearby, so someone might help you with a spare screen for testing?
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The following may be worth a try for the desperate:
Has worked for me on several occasions.
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