My 7 Plus screen has a pink tinge evenly over the whole screen. I’m wondering - is it the screen, a connector issue, or a...

Follow the guide for the 20 inch EMC 2133 and 2210. The differences between the 20 and 24 inch models are negligible. I replaced the graphics card (3 times!). After initial failure, the apple supplied replacement failed just inside the 90 day warranty period, the replacement for that was DOA, the third one is working OK. None of the replacements were new items, and the 90 day warranty for a $250+ item is a joke.