Chosen Solution
The backlight on my 27’’ iMac 2010 is slowly dying. Getting a little more dim every week, and I can see dark spots between the backlight “bulbs(?). I don’t have the tools or the skills to do the soldiering like some people recommend. Should I try to replace the display or does the inverter board solve this issue? How can I tell if it’s the inverter board or the literal backlight strip?Also does a 2011 display work in a 2010 machine?
Most likely the LED bar connection or a few LED have died and often the backside also gets darkened
Here’s one source iMac 27" A1312 - Mid 2010, Apple P/N 661-5568 and the guide iMac Intel 27" EMC 2390 Display Replacement