Chosen Solution
Hello! :) After a failed repair my display didnt worked anymore so I replaced it and it works but at the upper right corner its darker as the other corners and the whole screen. What I Need to replace? there was smoke before the repair what came from the Flex Cabel (Display). I think the Connector is Broken. Regards Louis
One of the filters that provide a connection to one side of the backlight needs to be replaced as that got shorted when the screen was disconnected or connected with the battery plugged in. You’ll need to take the phone to someone that does micro-soldering to fix.