Allow the EMI shield to hang down from the display.

Remove the four 8 mm with 2 mm thick head coarse-thread T10 Torx screws securing the display to the rear case.

These screws are recessed, so a thin screwdriver such as this is essential for removal. Bit drivers tend to be too short for this application.

It is strongly recommended to use a magnetized screwdriver so the screws won't fall into the iMac.