I do not have an extra logic board. But if you want it for this mod, you do not need it. I have a different method that requires no alteration of either the LCD or the neck. Nor does it require any components from a cinema display or other monitor.

I am currently putting together a Sandy Bridge based 20" iMac G4 All-In-One Mod based n this new approach.

See this Guide for details if interested:
http://dremmeljunkie.blogspot.com/2011/11/all-in-one-20-imac-g4-genuine-tmds-to.html
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The iMac G4 forever changed the way I viewed computers. With some modification it can be used as an external monitor or updated all-in-one computer.