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Colorful screen glitching -> broken display + workaround

My parents Macbook Pro A1502 recently developed some heavy screen glitching / colorful flickering all over. Here’s what I checked so far:

  • Issue starts right after boot to full UI, more present where there is (mouse) movement.
  • Rarely there are a few seconds where everything looks fine, fullscreen videos on YT weirdly seem to be ok.
  • Still glitches in red/green/blue if I set MacOS UI to grayscale
  • Screen also looks mostly fine during startup or diagnostics but sometimes shows the issue during the software update screen
  • The problem is not present on an external display (HDMI) or in screenshots
  • If an external screen is connected via HDMI, the flickering/glitching on the internal screen and the external display stops (HDMI cable w/o a device connected on the other end does nothing, though)
  • elementary OS does not show the same problems
  • Diagnostics additionally show NDC001, “CPU System Agent Core” in iStat Menus sometimes reads 0˚ (which I believe the machine might have already shown when I gave it to them 3 years ago, so probably unrelated)

Any ideas what the problem might be and how it could be fixed?

And what worse symptoms could come next, if any?

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Pretty much exactly the same issue was described here:

What is the cause of this display glitch?

The glitch pattern looks a bit worse and changing the logic board did not fix it.

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It’s more of a hack/workaround than a fix but costs 1% of a display and doesn’t even require tools:

I ended up getting one of these $5 virtual HDMI dummy plugs that we now just keep attached to the Macbook permanently.

This 100% solved my flickering problem and the machine is perfectly usable again.

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What you are seeing is signal issue between the main logic board and the displays T-CON likely within the display lid.

What I often encounter on systems like this is excessive screen cleaner dripping down wetting the T-CON board corroding up the display cable connector. Sadly, it would take someone with micro-soldering skills with a delicate touch as you can damage the display very easily.

To get a good idea on what’s involved review this MacBook Pro Retina Display Teardown

Here’s the area of concern

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You might be able to clean the connector and its solder joints. Otherwise its time for a new display assembly MacBook Pro 13" Retina (Early 2015) Display Assembly and here’s the guide MacBook Pro 13" Retina Display Early 2015 Display Assembly Replacement

MacBook Pro 13" Retina (Early 2015) Display Assembly 이미지

상품

MacBook Pro 13" Retina (Early 2015) Display Assembly

$449.99

MacBook Pro 15" Retina Display Mid 2012 이미지

안내서

MacBook Pro Retina Display Teardown

난이도:

운영

MacBook Pro 13" Retina Display Early 2015 Display Assembly 이미지

안내서

MacBook Pro 13" Retina Display Early 2015 Display Assembly Replacement

난이도:

운영

30 minutes - 1 hour

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Thanks for your expertise, Dan!

That kinda sucks as the display is the most expensive part, even used.

What I don't understand is why the issue completely disappears in Recovery mode, while running a different OS or even just plugging in an external screen through HDMI. That doesn't make sense to me if there is a hardware defect inside of the display. That should not change then.

Also doesn't 'feel' like it from the looks of things.

I have added a video of the issue, note how the blocks follow the mouse.

While nobody admitted to wet-cleaning the display lately, I wouldn't rule that out.

No micro-soldering skills and also no delicate touch here :(

I'll try to have a closer look.

Do I have to take off the whole display first to get to that connector?

Let's first think how the graphics services work in your system it either goes to your internal display or it goes to your external. Think of it like a Y in the road... Now one road is rutted up so your passengers are getting a very bumpy ride while the other is smooth as silk! Clearly the road is the issue not the car (logic board graphics).

Now lets look at why recovery mode or other OS is being used it appears to be fine but when running macOS its a mess! This gets into the driver and what it is pushing when using the firmware driver we are not getting the full ability of the display Vs when you are using the macOS driver. This is why you see it working better but at a reduced resolution!

Hopefully that helps explain things

As to your best direction: Maybe its best to find someone local with the deeper skills to fix your system. Or, just replace the display assembly which might be easier for you. Or, just use it with the external monitor.

@danj With reduced resolution this would make sense - but it's not reduced.

Does that mean that even when it's running full resolution inside macOS but the screen is either mirrored or extended over HDMI, the frame rate of the internal display is somehow reduced, compared to not using any external display?

I'll bring my pentalobe bit next time I come for a visit so I can have a closer look.

Before getting a new display I'll probably try something I just saw on Amzon: 'HDMI Dummy Plug 4K Display Emulator' - for like $5. That would be the weirdest 'fix' ever but might actually work.

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