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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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What is the cause of this display glitch?

Hi Ask Ifixit.

My girlfriend's MacBook Pro has some issues, as the screen is showing a scatter of different colours whenever it is turned on, making the internal screen useless. It looks different every time the lid is opened, and what could look like a GPU failure. When using an external monitor the internal screen and external screen both works completely normal.

I have added pictures to illustrate how it looks.

I ordered a new logic board as I was convinced that this would be the troublemaker, however the problem persists. Does someone have an idea of how to fix this issue?

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Video Demonstration:

https://youtu.be/jcFCM7lVTsQ

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The output from the CPU graphics engine goes through a set of MUX logic gates which allow the signals to exit out of the two Thunderbolt 2 ports as well as the HDMI port and lastly the internal display. It’s something in this logic which is messing up the video signal.

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What happens when you plug in a HDMI cable by its self into the port (nothing on the other end)?

Update (11/04/2020)

@thogerabildgaard - You'll need to find someone who can fix your logic board or just replace it MacBook Pro 13" Retina Display Early 2015 Logic Board Replacement

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Hi Dan, thanks for your input!

Nothing happens, if I plug a HDMI cable, which is not connected in the other end.

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@thogerabildgaard - Black screen or same pattern junk?

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It is the same pattern junk, I will upload a video as demonstration. Do you think the internal display needs replacing? I mean, the internal screen works when an external screen is connected.

Edit: link to video is added in post

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Hi, thanks for the update. I already did replace the logic board, but i'm having the same issue. What else could the issue possibly be?

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Then you mis spoke in your symptoms. You implied the external display was also showing the a clean image as well as the internal display when plugged in. Which aimed us at the logic board.

So if that is not true that pushes the issue as being the internal display within the T-CON logic it has. That would require a new display assembly.

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