Anyone who thinks the markings on the back of the iPhone will influence whether it is recycled (rather than the trade-in value, accessibility of recycling facility or a customer’s own environmental awareness) has probably shoved a spudger too far up their nose.
To get to this point in the repair/upgrade, please see steps 13-31 in "iMac Intel 20" EMC 2133 and 2210 Logic Board Replacement" iMac Intel 20" EMC 2133 and 2210 Logic Board Replacement. If I had followed these steps, I wouldn't have ruined my board trying to attempt this repair.
Authors, please add these steps.
Well, I figured it out. The view shown in this step is from the underside of the logic board, once it's already been removed from the iMac.
Newbies beware: there are several crucial missing steps in this guide.
By the time I got to this step, this picture didn't resemble anything I see in my 20" early-2008 iMac. I don't know if you forgot the step about removing the fan, but the heat sink isn't visible until you do. Even then, there's no temperature sensor where your illustration indicates there is.
There's definitely a skipped step here, and there may be some difference between the board you're showing here and the board in the early-2008 iMac. From what I can tell, it's both.
Newbies, proceed with caution.