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A1706 / EMC 3071—Released in November 2016, this 13" Macbook Pro introduces the OLED Touch Bar. Features a dual-core "Skylake" Intel Core i5 CPU and four Thunderbolt 3 ports.

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Internal Screen only working when attached to external monitor

Hi there,

I have an odd problem: I recently left my MacBook Pro late-2016 in the car over night, while it was freezing. At first it worked well, but after a while the screen started flickering to a degree that it became unusable. When I attach the machine to an external monitor, though, it works perfectly fine. The screen also works when I reboot the computer in safe mode without attached to an external monitor. Any ideas what might be the issue and how to solve it?

Many thanks!

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Oh thanks so much, Dan. That’s much better news than I expected. I was looking for answers for ages, so this is absolutely great! Thanks a lot!

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I’d say this is very odd indeed!

OK so the external display works cleanly, yet the internal flickers. If you put the system in Safe mode the internal screen works correctly.

So what is different here is the displays frequency! Unlike the 15” model the 13” model only has the intergraded graphics engine within the CPU (Iris Graphics 550), So when you put the system in Safe Mode you are reducing the display from 2560 by 1600 to 1280 by 800, basically, lowering the frequency.

So what is the cause of this failure? The T-CON board is what physically controls the LCD and depending on what it is told by the graphics engine will alter the frequency.

The T-CON is part of the display assembly MacBook Pro 13" Retina (Late 2016-2017) Display Assembly and it actually quite easy to replace! MacBook Pro 13" Touch Bar Late 2016 Display Assembly Replacement

MacBook Pro 13" Retina (Late 2016-2017) Display Assembly Görseli

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MacBook Pro 13" Retina (Late 2016-2017) Display Assembly

$454.99

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Hi Dan, one more question, if I may. Could you think of a temporary fix, perhaps via a software adjustment. E.g. is there a way of telling the machine that it is 'connected to a external monitor', even if its not? At the moment, I am using a hdmi-dongle as a dummy... Thanks a million for your great help!

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Now you've lost me??

What does your HDMI dongle have to do with your internal display not working?

Are you trying to tell me having the dongle in place quiets the flickering?? Thats not how I understood what you had for an issue. This is starting to sound like a noise capacitor has failed which could be either the only issue or you could have two issues intertwined!

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Hi Dan, indeed. When I have the HDMI dongle attached - even if the dongle itself is not connected to a screen - there is no flickering whatsoever. So, I am now running around with an HDMI dongle attached to it all the time. Good to hear you find it weird too. Can't figure it out.

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Without telling Apple what happened have you tried seeing what they say yet at the Apple Store?

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Not yet - I'm not covered by the guarantee anymore and so I was reluctant to make my way to the apple store.

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