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How can I troubleshoot my MacBook Pro getting blue/pink/white screens?

My MacBook Pro (Mid 2015: MacBookPro11,5) recently had its logic board replaced. I was having some problems with the Thunderbolt port, so the flex cable was replaced.

Since the replacement of the flex cable, I keep on getting Pink, Blue, and White screens that freeze the machine. They occur intermittently, so I am worried that if I take it back to the store, they won’t be able to reproduce it. How can I narrow down what’s causing it?

This is what I have found so far:

  • The pink screens occurred after I had done a clean reinstall and attached the Mac to an external monitor. It actually happened during setting up the Mac home account (after the clean reinstall). Therefore, I know it’s not software related.
  • The pink/blue/white screen is more likely to occur when attaching the Mac to an external monitor and playing video.
  • If I connect the Mac to an external monitor, disable “automatic graphics switching” and then play video, the pink/blue/white screens are less likely to appear. However, they will appear after a longer while.
  • If I connect the Mac to an external monitor, then the screens do not occur when using Safe Boot mode (although of course, it's not possible to play video in safe boot mode).
  • If the Mac is not connected to a monitor, then the screens are far less likely to appear, but they do appear occasionally. When this happens, nothing is connected to the laptop, not even a power supply.
  • I have tried different brands of monitors, so I know the monitor is not the issue.
  • Sometimes instead of a pink/blue/white screen, the mouse cursor will just become distorted and the display will become frozen. Then a black screen stating “Your Computer Restarted Because of a Problem” will appear. The system will restart but freeze on the boot screen.


Any ideas on how I can narrow it down? Is there any software I can use to detect the problem?

I am using MacOs 12.6.1 on an Intel Mac (MacBookPro Mid 2015).

PS I know I can take it back to the store and also take photos/videos of the problem. However, I would really like to narrow down the issue so the store can reproduce it. So I am looking for answers that relate to narrowing down the issue.

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To be clear when using the external display you don’t see the issue on the external but still visible on the internal?

par

Thanks for the reply! The blue/pink/white screen will only appear on the internal. The external monitor will either go distorted (with stripey lines) or go all dark gray or go black.

par

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Not good ☹️

With so much failing I wonder if you have liquid damage. I see issues just within the logic board between either the GPU and/or MUX logic and possible issue within the display based on your symptoms.

There are two versions of this system the low end models depend on the CPU’s integrated graphics (IG) or comes with a discrete graphics with the Addition of a AMD GPU (DG) in the higher end models.

The fact the internal and external displays show different conditions also tells me the internals displays T-CON logic is also having issues too!

I think you really need to find someone local who has Mac repair skills to see what they say.

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Big Smile sera éternellement reconnaissant.
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