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iMac Intel 27インチ EMC 2374のAMD Radeon HD 4850ビデオカードの交換

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    [video|]Late 2009 iMac 27" Video Card Repair — ATI Radeon HD 4850[/video]
    This video guide (see "Video Instructions" below) shows how to disassemble the iMac in order to remove and repair the video card, then reassemble and test. I recommend that you label all connectors to make them easier to reconnect without error. I also suggest you watch the video guide on YouTube so you can read important information I added under the video there in its text description -- open the video on YouTube, look beneath the video and click on "SHOW MORE" to see all the notes.
    The basic procedure shown in my video has been successfully performed by others on model year 2010, & 2011 andiMacs; however, the bake CANNOT be performed on late 2012 and newer “tapered edge” iMacs because their video card GPU is soldered to the main board.
    I also made a SECOND VIDEO showing my second bake, which provides even more useful information such as the thermal paste I successfully used and how to apply it:

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