Chosen Solution
Sometimes these machines get an issue where the backlight becomes tinted pink all around the edge or border of the display. This seems to happen commonly after removing and reinstalling the display. I’m guessing it’s due to some subtle damage to the display during the removal process. I’m wondering if there is any way to repair this issue. Thanks.
You will have to replace the entire display to resolve discoloured backlights. I’ve seen this usually happens when using things like isopropyl to soften the adhesive or putting a cutting tool in too far in that it hits the panel. I would recommend only using a tool like this to open up iMacs, I have never had an issue with them and they are perfectly sized so they don’t damage the panel. iMac Opening Wheel
