Replace graphics card on 27" iMac

Hello
The graphics card on my Late 2009 27" iMac has gone puff!
I've got yellow vertical lines on the screen and the only way I can get the machine to start is by removing the graphics extensions from the library... it's a pain in the but as it makes the machine unusable in it's current state - But I'm cool about it all as it still works perfectly well as a monitor for my MacBookPro
Anyway, all that aside, can anyone tell me if the cards are replaceable or are the soldered onto the mother board and, in short, I'm buggered!!!
I've already replaced the hard drive, so I'm happy enough to dig inside and change the thing if I can, I just did;t want to start only to find that it's soldered on!
If it can be replaced can any one recommend a good retailer in the UK that I can get one from?
Thank you in advance!
if it helps the machines serial number is - VW*****5RU
Regards
Silver!
<Edited By Host>

The Radeon graphics card in the late 2009 quad cores can not only be replaced, it can be upgraded! https://www.ifixit.com/Guide/iMac+Intel+27-Inch+EMC+2309+or+2374+Graphics+Card+R eplacement/9553
You just gotta be able to find one!

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