Display replacement/display dont work - Xperia Z1 Compact Q&A, Help & Troubleshooting

hey guys.
since my z1c running with android 5.1.1 for at least 2 years, i upgraded it to 7.1.2 Nougat.
--> im using this : "Lineage Os 14.1 [Android Nougat 7.1] Unofficial Custom Rom for Sony Xperia Z1 Compact (amami)" on coustomdoridos. c o m
now my gf broke my screen. i replaced the display of the z1c 3 times but now the screen shows the homescreen for example and then "flows away", the screen picture turns back, also the touch dont work.
as i see, i could only show u the pictures after at least 10 posts, so i try to describe the problem: the display shows my homescreen for one second (withe stripe on the top of the display), then it freeze and it begins to show light white stripes from top to bottom since it is white all over and then it go dark (takes a few seconds).
now i had in mind that it could be a software problem, so i downgrade again to 5.1.1 (D5503 running with android 5.1.1 build 14.6.A.1.216.) using flashtool and the display nearly runs like the original one. there are just a few light stripes in the middle on the display, i can live with that. touch also working now (but could be intresting from where they come from...)
my questions are, if someone had the same problem, and what could i do to get 7.1.2 Nougat back again with the new display without the known display issures?
greetings, xmo

edit: since the phone runs with the new display the light stripes dissaper ofer time, maybe the display needs some heat? oO
edit2: i have this problem also going in the recovery mode of the phone with twrp. 1 sec clear then the screen nearly went white, but touch is working.

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tomhurst said:
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Click to collapse
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