Apple IMAC DV, IMAC DV SPECIAL , Identifying the 400 MHz Logic Boards

Take Apart Logic Board - 48
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 new Version 2 logic
board (661-2316) does
not
have a daughterboard.
Logic boards must be exchanged like-for-like. Refer to the
service parts database or the Exploded View chapter,
“Identifying the 400 MHz Logic Bboards” for addition
information.