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Model A1311 / Late 2009 / 3.06 or 3.33 GHz Core 2 Duo processor

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Pixilated screen :Video controller error 4V DC 1140000003

My Imac boots up intermittently to a pixilated screen, or a white screen with vertical bars, sometimes goes as far a desktop, but that is pixilated as well and freezes. The AHT shows this code: Video controller error 4V DC 1140000003. External monitor shows the same pixilation as main monitor. My Question is where the video controller is located, and if I can fix this by simply replacing the logic board. Thanks for any tips.

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Thank you Dan. I have the MXM daughter board , and I just send it of to California to get repaired. We will see how that pans out. Cheers, J

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Depending you your model it either uses an onboard GPU so you'll need to replace the complete logic board or you have the higher end model which uses a MXM daughter board which might be all you need.

Here's the IFIXIT guide you'll need to follow: iMac Intel 21.5" EMC 2308 Logic Board Replacement and you'll need one of these:

Intergraded Graphics:

  • 3.06 GHz - 661-5305
  • 3.33 GHZ - 661-5306

MXM Graphics board:

  • 3.06 GHz - 661-5307
  • 3.33 GHZ - 661-5420

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Jurgen will be eternally grateful.
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