Can my Late 2009 24" iMac's video card be replaced without replacing the entire logic board?

Can someone help me determine if my video card is built onto the logic board on my Late 2009 Intel 3.06 mhz 24" iMac? The video shows corruption (checkered blocks) with a progress bar at the bottom of the screen, then it reboots in a cycle.
According to similar problems found on the web, I'm failry sure that the VRAM is corrupt. Apple Tech support had me do a reset on the PRAM and that only changed the direction of the corrupt pixels on my display. I also ran the Apple hardware diagnostic program that came with the iMac 3 times and it found no problems (from what I could tell squinting through my corrupt display). The S/N is W891507C250.
Thank you,
Will W.

I appreciate your reply and you are correct about it being an Early 2009 iMac.
But I'm not sure that you are correct that all Early 2009 iMac's do not have seperate video cards though. You may be, but according to other sources on the net (such as the link below) claim that some Early 2009 24" iMac models with certain video cards (i.e. NVidia, which I have in mine) are replaceable without replacing the entire logic board.
Again your feedback is appreciated, but I was kind of hoping for an Apple employee or at least an Apple Support Forum Admin to give me an official answer.
http://ifixit-guide-pdfs.s3.amazonaws.com/guide_13765_en.pdf
Thank again,
Will W.

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---Details---
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Message was edited by: sr.matto (spelling)

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Can my Late 2009 24" iMac's video card be replaced without replacing the entire logic board?

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