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A1708/EMC 3164 — 2017년 6월 출시, 이 기본 레벨 MacBook Pro는 (OLED Touch Bar가 아닌) 기존의 function keys를 유지합니다.

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Horizontal line on bottom of MacBook Pro 2017 (Due to overheating)

Hey everyone,

Long story short- I share my laptop with my room mate. My room mate confessed to me that she was using the laptop on her bed, over the sheets with the power adapter plugged in. She said that the machine got really loud (I guess the fans or whatever were going off)

It overheated.

Later that day I noticed that there was a black line below the app menu on the bottom. It was weird because I would move the cursor over it and you could see the cursor. I have ran NVRAM and SMC and it hasn’t fixed the issue.

However, we left it shut down over night and it was ALMOST completely faded in the morning (though with use the lines would eventually come creeping somewhat back but not as bad as the first day.)

I don’t want to be super hasty and assume I am in for a $500 repair. I have seen similar posts on here where people had the same issue and they said that the lines eventually went away, or that after a week of not using the laptop they got lucky.

Has anyone gone through this? Is this something that will get worse over time?

Is it possible the over heating caused one of the cables to come loose inside the computer? I was thinking of opening up the laptop and reseating the display cables.

Does it ACTUALLY need a replacement or is this something that will go away with time/can be solved by opening up the macbook or leaving it off for a while.

As is the case with most people, I don’t have the money at the moment to handle what would probably be an expensive repair.

I would complain about how the computer is only two years old but I am pretty sure its my room mates fault for the overheating lol.

If any of you have any suggestions or similar experiences I would really appreciate it.

Thank you for your time.

Update (05/13/2019)

Hi Dan,

Thank you for your quick response!

These are the before pics:

(Day of the heating issue)

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You can barely see it. Its just a bit brighter down there than the rest of the screen.

Though I am sure they will probably get stronger with usage. I think it was on another forum but a few people had said they left it alone for a couple of days and it got better.

Thanks again for your time with this.

답변되었습니다! 답변 보기 저도 같은 문제를 겪고 있습니다

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Can you post a picture so we can see what you are seeing 기존 질문에 이미지 추가하기

Until we get an idea on what you are facing I would hold off opening your system as you could make things worse!

I'm not sure where you saw lines fading in and out here. I don't remember seeing anything here on iFixit.

Often times lines are TAB connection issues when the mounting of the flex ribbon to the LCD panel has broken free. Often due to a bang or something heavy sat on the lid.

The other possibility is image persistence (image burn-in) where the LCD crystals have fatigued from being held active overly long. There are some tricks that might reduce the effect.

The pictures will help us understand which one.

Hey Dude,

I had this problem 2 Months ago.

it is not because of the Display at all.

It is Logic-Board Problem.

They replaced it for me!

Be aware it is not Display Problem at all!

Good Luck!

It is because of the logic board indeed but the T-CON logic board of the screen, which requires a swap of the display assembly, not the motherboard. So...

Have the same issue with my 2017 MPB 13 inch!! Should Apple not be responsible for this? Kinda expected a 2k+ product to last more than two years…

Turns out, heatlines are also fixable with replacing thermal paste and fan cleaning if the damage isn't severe. I published enhanced guide on this ?https://meiokubo.medium.com/guide-for-re...

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OK, this is a very different kind of problem than what I was expecting. The LCD display panel its self does not have any problems! This is a heat issue with the T-CON board.

Let me explain … The T-CON board is mounted just above the heatsink radiator within the main case unlike the older MacBook Pro’s which had it mounted within the lid with the LCD display panel.

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So when you blocked the ventilation the board overheated causing it to loose its horizontal sync at the bottom edge of the display giving you this colorful line.

This board is part of the display assembly so if it does get damaged from overheating you’ll need to get the full assembly replaced which would be an expensive repair!

So you are lucky! The overheating didn’t damage anything as it did recover. So lesson learned, don’t block the ventilation and keep the fans clean and don’t block the vents! ;-}

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Hey! @danj So that is a relief! Thank you for much to getting back to me. Is there any way that I can fix the remaining brightness that is left though?

Will it eventually go away?

Because as I had mentioned earlier the lines do start to come back after a bit of use, although not as bad as the first day. Is there anything I can do by opening up the laptop or is the damage that is already done there permanent?

Sadly, there is nothing you can do to effect things from the inside. This is not a cable issue.

Give it some time, hopefully it subsides otherwise you'll need a new display assembly ($$$).

Hmm, those T-CON boards at least in my A1708 resides in the different, isolated from the heatsink, compartment. Yes it is close to the heatsink but not above it per se. It is separated by the wall, which is an integral part of the top case (i.e. a radiator). There is no air circulation in the T-CON board's compartment though, so it could get hot in there especially if the cooler is blocked for a prolonged time which will result the MacBook's body to get very hot, and then it is probable that it could lead to the stress on the T-CON board but most probably not enough to damage it because all those thermal sensors will shut everything else down before the temperature of the case will hit the 100 degree Celsius. So, I would say the damage is rather due to the shock/fall/hit to the Macbook. Combined with the thermal stress it could provoke the T-CON board's failure.

@Seff Ka - Heat doesn't always follow the air flow! Here the wall heats up and transfers the heat to the other side! Just like your car gets hot with the windows are closed the inferred light passes through to glass.

I spent a bit of effort to test things using a thermal camera I was able to see the problem! Comparing side by side two 13" models: A1706 & A1708 trying to understand why the A1708 had more of a problem.

Your 13" Fn model (A1708) only has one fan heat sink which is undersized if you push it hard! As a comparison the 13" TB model (A1706) has a two fan/heat sink supporting the same IG setup and doesn't encounter this problem as much!

mine has the same problem.

i first faced it like tow daya ago and it was gone after i stopped using my Mac for awhile.

and today, that problem apprears again :(

@Seff Ka

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Sign this petition guys


to get Exchange and Repair Extension Programs


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Hey AndikaPutra, my laptop is MacBook Pro (13-inch, *2016*, Four Thunderbolt 3 Ports). Still signing though!

Wait, I signed it but just read from your description that there is already a certain program for this issue on 2016 models. Could you explain what you know about this?

@Not A Doctor, Shh & @Seff Ka - The backlight repair is for the stage-light effect due to the backlight ribbon cable being too short so its stressed here's more on it: The Design Flaw Behind MacBook Pro’s “Stage Light” Effect

This is a very different issue! The black bars (top or bottom) is due to over and under-scanning of the LCD panel (you'll also often see the menu bar text be compressed).

This is the job of the T-CON to pump the LCD with the needed data to set the pixels on and off as well as the correct color. Timing is critical here! It's this timing logic within the T-CON board that drifts due to heat!

@danj As a designer myself, I'm notorious for pushing the boundaries of engineering to create aesthetic and glorious concepts, but I'll be the first to kick in the heads of designers who create good looking technically unsound products.

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Hello dan and bruce. Right now I'm having same problem about my macbook pro 2017 13inch. My macbook did have some line in bottom if its had overheating. But if my macbook in normal temperature it disappeared. Here is my question, did your macbook runs well without any problem? If its runs well, i hope you give me solution my macbook. Please:(

This is in normal

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This is the problem

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Sadly, the solution is a new display assembly, there is no other option.

Hi Dan,

Question - if the root cause really is overheating, isn't it likely that the replacement display too shall be damaged (sooner or later) due to the same overheating?

@Manish Agarwal - sorry for not seeing your post sooner.

Sadly yes! But its a matter of being on top of the heat issue by installing a good thermal monitoring app and leveraging it to kick the fans on sooner. Also don't forget the process load! So try not to over do it. Fewer open tabs with Chrome, smaller rendering jobs.

how much does a new display assembly cost ? does anyone know ?

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Hello, I have the same problems. Macbook Pro 2017 - I have a 13-inch model. At first, horizontal lines appeared at the top, and now the screen is completely filled with lines. I use the screen by connecting it with HDMI. I think this is Apple's chronic problem.

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I’m having EXACTLY the same issues!

It become so bad that all the lines completely cover the screen and it freezes the images. And most funny the different windows apear on the top of each other, very faint. This is happening only in the display of the Mac, but using a HDMI cable and a TV works fine.

I have a MacBook Pro with touch bar 13’.

And because I’m very lucky, some letters are not working well and apparently there is a recall to change my keyboard!!!!

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I am also facing this problem. When I turn it on in the morning screen looks good. But after 15-30 minutes of use they start to appear and within a few hours, almost half-inch of the screen from bottom becomes black. Is there any way to fix it?

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Yes, but its costly! The T-CON board which is part of the display assembly has failed.

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Hello @danj,

I got the same problem actually, I called Apple, they did an online Diagonistic, there was a problem with the battery. I was so lucky because there is a program from Apple (Keyboard Replacement). They replaced the Upper-Case and after that the problem still there!

I left the MacBook for 1 Month and after that I started it up and the problem reduces so much. The lines before were like 4cm height from the bottom of the screen. After the month just some lines appears on the Botton when the Mac overheated.

I called Apple again and I told them about this issue because I have 90 days Warranty for the replaced parts after repair. I will try to get that fixed for free otherwise I have to buy like almost 600 Euro for the Display!

This is my experience.

Thank you all!

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Hi, i got the same issue on my 2017 MBP 13” function keys - 2 thunderbolts.

Right around the start of April a black zone, a black line started to appear on the top of the screen.

The line is just below the menu bar.

It starts off as just a little grey fade, but as i use the computer for several hours, it gets pitch black and grows in size, reaching about 6-7 mm in “thickness” along the vertical of the display. Needless to say it stretches entirely horizontally. If i leave the computer in idle or off for a few hours or overnight the line goes away, only to come back progressively after a couple of hours of use the next morning.

Note: unlike a case stated above, i never used the notebook on a bed or something like that, it never became as hot as the sun. I totally do an intense use of it, but hey, it’s got “Pro” in the bloody name…

The line is just like the other reports, it doesn’t “hide the cursor”, it still kind of sort of shows content and it goes back to normal as the computer cools down, so I don’t think it’s dead pixels. As the hours passes it gets to “weird colours and text retention”, for example the address bar of Safari stays in the black area for a bit even if I switch to another app. Luckily (knocking on wood) the “damage” doesn’t seem to be spreading, or it’s doing so very very slowly. I now use the notebook’s own display the less time i can, relying mainly on my primary HDMI monitor, but still, my workflow needs multiple hours of dual-screen action each day.

Called Apple, they got me to verify a bounce of software stuff, reset the SMC and all that kind of things but no - problem is still there. They told me since my warranty expired in September 2019 i’m out of luck (in my country, 2 years warranty is the standard).

I seriously hope they do a recall for this, because we all know it’s only due to Apple’s crappy thermal design. When Apple stores re open post lockdown, i’ll try to go there, be a ##&&% about it and try to get them to recognise the issue as a factory defect…i seriously hope its like the butterfly thing, that seemed random and to affect few users initially but then exploded and Apple had to rectify it. I guess i’ll be hard on the “crap keyboard, now crappy display” and “good way to lose loyal customers”. I guess I’ll see.

Side question for you all: i also wanted to replace my thermal paste (actually came on iFixit to look for a “don’t mix up the screws” guide and found this thread in the process) to improve temps a bit, since we all know Apple loves to put crappy rock hard thermal compound in its thousands dollar machines…my warranty as said has already expired, last and only time the computer was opened was July 2019 for a warranty-covered battery and keyboard replacement (luckily that was a recall). Do you think that by opening it up myself i risk "upsetting” Apple even more when i’ll bring it in to try and get the screen replaced, and I’d better do it afterwards? Or since the machine is out of warranty anyway i shouldn’t care? Since i already know they’ll try to negate any responsibility for the screen defect, I don’t wanna give them the easy excuse of “someone else opened it and broke it”.

Thanks to everyone.

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Hey Luca, I have the exact same issues in the same pattern as you do: Display is okay in the morning, light grey continuous horizontal lines at bottom near the menu dock after a few hours of usage, darkening through time, sometimes new lines developing near the bottom 1/3rd section as time passes and returns to normal when left to sleep or shut down for a few hours, but sometimes remnants remain from the previous day if the usage was heavy. I'm not a Human Pro but my laptop is a Macbook Pro and I think it's warranted for the price that it keeps up with me. Especially since I'm in design and this is what the laptop is for.

Did you notice that this issue started after you installed Catalina? Sinec I have only been having this issue since NOvemeber or so when I updated to Catalina. Along with this, I have had the issue of the TouchBar going off regularly and coming back to work whenever it feels like.




I'm pleased to say that my issue (knocking on wood) has disappeared from one day to the other.

It "took" a period (couple of weeks) of using the laptop mostly with the lid closed (no display on, second monitor only), but now I've been back at using it with display on and pretty intense use and the line hasn't reappeared. [Note how I say from one day to other cause, even if for most of the day the lid was closed, I checked the display from time to time to see if the line was there. It was until one day it didn't appear anymore...]. Pretty weird considering the climate has actually got much hotter where I live, but hey, that's what it is. No software update I can remember of in the time period the issue disappeared.

I only had the issue with Catalina, but I don't think it's the OS fault, because I've installed it in October or so and the issue started to appear only in late march/early April more or less.

Hope that was helpful, you may wanna try the "display closed" thing if you can and see how it goes

Thanks for replying, @speedbird999 Luca. I shut down the laptop completely when I'm not using it. This seems to be helping. Considering I need the laptop for work, and also due to the virus, I'm not able to bring in the laptop at the moment for any repair.

hi Luca,

wanna ask something. you were still using it with the display closed untill the problem dissapear ? @speedbird999

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I just tested for a while on my end since June.

I placed an actual fan running behind the screen. It can stay the entire day without revealing the lines. Temporary solution but it works.

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Just got the same issue with mine!

Overheating while using MS Teams for videoconferencing….
Top and Bottom lines as you guys well described. Scheduled with AppleServiceRepairCenter tomorrow, but not very optimistic with any free repair. It’s a shame apple have not recognized this problem yet!

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A couple of months ago I bought a refurbished Touch Bar 2017 13” MacBook Pro. Nothing wrong with it except when I opened the display past 45 degrees the display would glitch out for like 5 seconds and sometimes show a long black transparent line, identical to the one shown in Bruce’s picture. It would go away if I moved the lid to the 45 degree angle. At the time I thought it was some sort of flexgate. The lines never appeared when I was using the MBP, even on zoom for 1 1/2 hours straight. Over two weeks, the lines started to stay longer. I did return and bough a 2019 (which I hope never gets this issue). Here are some pictures.

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bruce 님은 대단히 고마워 할 것입니다.
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