Back panel is held on with 30 plastic clips. The clip locations are circled in red.

10 across the bottom. The clip sticks out from the black frame into the white back.

8 across the top. The clip faces towards the center of the monitor. The clip sticks out from the white back into the black frame,

6 along left and right side. The clip faces towards the center of the monitor. The clip sticks out from the white back into the black frame.

There is a single screw near the HDMI connector

Use a thin metal tool (jimmy) to slide between the white back and black frame to release the clips.