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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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Strange screen flickering riddle (different colors and shapes)

Dear community,

please help me, I have a really strange problem with my MacBook Pro A1502 (Early 2015 13"). I bought this MacBook used a few months ago. Everything worked fine, no problems. A few days ago I have a song about Added iTunes and all of a sudden the image started flickering and wouldn't stop.You can see it in the images below how it manifests itself on the screen.It occurs from the boot process about when the loading bar is about halfway through and the only thing then flickering is the Apple logo and loading bar.

Flickering does not occur when:

  1. My MacBook is connected to an external monitor via HDMI or Thunderbolt 2 (no flickering on either screen, everything works normally)
  2. The MacBook starts in safe mode
  3. It is also not visible on screenshots or screen recordings
  4. As soon as moving images are running (i.e. videos, but also e.g. the camera frame of a person in teams) it flickers 3-4 times and then it stops. Also mouse movement reduces it.
  5. It happens less often when CleanMyMac is running in the background (I installed the program after the screen flickered for the first time)
  6. The Problem does not occur on Windows 10 installed with Bootcamp

#

What I've tried so far:

  1. Mac OS Montery 12.1. newly installed
  2. MacOS Montery 12.1 Cleaninstall
  3. MacOS Mojave Clean Install
  4. Changed the LVDS cable
  5. PRAM, VRAM, SMC reset

If I do nothing then it flickers at irregular intervals, duration and in different patterns and colors. The last of my attached pictures shows how the flickering manifests itself in full screen mode. As soon as I'm in full screen mode, it's mostly just grey/white squares.

I'm thankful for every idea you have, because I don't have ideas any more.

Greets from Austria

Philip

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Ответ на этот вопрос У меня та же проблема

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What does an external display show you when you plug it in?

If it shows the same thing then the Graphics engine within the CPU has failed. If the image is clean then the internal display is bad and needs replacing.

Unlike the older Unibody systems the video signal is not LVDS which can have issues with the cable creating some strange artifacts. Here with the Retina series Apple moved to eDP/iDP signaling which is more akin to the different between analog TV vs digital TV, so a messed up cable just won’t work or you get image tear blocking which I don’t see here.

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Hi Dan!

First of all thanks for taking the time to help me with the problem.

As I wrote, the flickering no longer occurs as soon as an external monitor is connected. It is also not visible on screenshots or screen recordings.

I was almost convinced that it must be a hardware problem but today I installed Windows 10 using Bootcamp. The Flickering does not occur on Windows 10. So I think a hardware problem can be ruled out now... The error must be so deep in the MacOS that not even a cleaninstall solves the problem. I don't even know if that's possible, but what else is it supposed to be?

If you have any other ideas please let me know.

Greets

Phillip

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@Phillip Steinbach - Sorry I missed you had tried the external, my dogs were at me this morning.

That makes sense! MS Windows video driver does not support the Retina level

From Apple: 2560-by-1600 (Retina); Scaled resolutions: 1680 by 1050, 1440 by 900, and 1024 by 640 pixels.

So the display is not running at the higher scan rate under MS Windows.

Sorry its hardware ;-{

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Hello @danj! Sorry, I didn't get a notification that you had replied. Also, I have now actually given up because I no longer know what to do.

Are you sure? I can set 2560 by 1600 in Windows. Under Linux Ubuntu, the problem doesn't occur either... But I've actually tried everything that can be tried in the meantime. Which component do you think it is? It can't be the GPU. And I don't know if I've expressed myself clearly, but with an external monitor connected, the Retina Display doesn't flicker anymore. And that also rules out a display defect, right? Extremely strange problem in any case...

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@Phillip Steinbach - If connecting an external display fixes things then the MUX logic on the logic board is messed up as the external display is adding a bit of load which is what the real issue is the load values are messed up.

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hi Guys I have almost the same problem and same means of not having the issue on a macbook 2017 13in without touchbar A1708.

Alsmost same as I have flickering blanc screen

One additional “fix”. When i have CleanmymacX opened on the main menu… flickering and black screen disappear.

It sounds like GPU settings could fix (loading the GPU in MacOS under the same parameters as windows 10)… but i have no idea how to do that.

Any idea, very welcomed

(I’ve tried enabling color filters in accessibility as suggested in a youtube video but it doesn’t work for me)

Cheers

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Sorry guy! The app doesn't really fix things. What you are seeing is the app is setting a lower scan rate so it appears to be better now you can't really use your system in this state so when you task switch the scan rate could alter higher which then brings the issue back!

Bottom line you need your system fixed its either the display assembly or its the MUX logic loading.

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Phillip Steinbach будет вечно благодарен.
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