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Hello Guys i have a question about my proximity sensor, I replace my sensor to an other screen and its not workin properly anymore, When i am making an call i use my finger to try to lock the screen and it works but when i hold in to my ear it some times go on lock sometimes it does not, can someone please help me out herr

Usually I find out this is caused by a screen quality issue. The only fix I found was to use a better screen that would make the proximity sensor more sensitive and work properly. Switching to a preassembled original screen will work too (If you can find an iCloud locked phone to use for parts).