Apple IMAC DV, IMAC DV SPECIAL - page 500

Exploded View 6
Identifying the 400 MHz Logic Boards
There is a new version of the 400 MHz logic board for the iMac DV and iMac Special Edition.
The easiest way to identify the boards is by the daughterboard. The Version 2 logic board
(661-2316) does
not
have a daughterboard. Logic boards must be exchanged like-for-like.
Reference the graphic below to identify which board you have.
.