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Released October 24, 2011 / 2.2, 2.4, or 2.5 GHz Quad-core Intel Core i7 Processor

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Distorted screen using integrated Intel GPU

I'm having problems with the dedicated GPU on my Macbook Pro 15inch which whereby I'm not able to boot beyond the Apple logo into the Mac OS screen(having distorted screen as well).

Fortunately, after I followed the dosdude guide about gpudisable on dosdude.com/gpudisable, I am able to configure my Macbook to use the Intel GPU. I tried connecting it to an external display but failed to detect any signal, I assume this is normal since the dedicated GPU is faulty.

However, the distorted screen issue is still there. I have attached a few photos regarding the issue.

  • The screen colour will turn red when the background colour is black. This is specially obvious in the Single User Mode.
  • If there are any windows opened, there will be linings surrounding the windows.

I am now wondering whether the issue is on the logic board or the LCD. I can replace the LCD but I'm afraid that the logic board is the culprit here.

Any clues on how should I troubleshoot on the root causes?

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Updates: Added image of LCD connector

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I would drop a line to DosDude to ask if his alteration stopped the use of the external Thunderbolt/DP port use.

If he can verify the ports should still be working then I’d say the logic board is gone.

I would look at getting a 2012 logic board to replace yours. In fact I’ve done over a dozen systems now and the system I’m pecking on now is a converted system! Well worth the effort.

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I have read somewhere online that the mini display port video output is wired through the dedicated GPU and I think that's why I can't connect it to external display.

Probably I will go for a logic board change soon but before that I have added a new image of the LCD connector which seems to me it might "not be normal".

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@jackyleecy - That must be a very special MacBook! Sorry thats not true!

The system only has one video output (Intel Iris graphics or AMD GPU video output) which is MUX'ed to the internal display and if a external is plugged in, it is either mirrored or offers an extended desktop of your internal display.

Think of it this way... Your car has a stick shift with three gears (low, med or high), here we have two video engines a low power one and a high power one. The system boots up under the low power one (Iris) and then jumps to the high power one (AMD) when the app requires it or if you are using an external display or lastly, you have set it to the high power (or low) using the energy setting. The Iris engine is still technically able to run the external display. I verified this is the case when I've turned off the AMD GPU output.

As a frame of reference I use gfxCardStatus to control the switching between the two Graphics Switching

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