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2021年4月に発売されたApple社製24インチiMac (M1)の修理ガイドとサポート情報です。

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Horizontal lines over iMac 24 screen

Hi,

I got horizontal lines over the display! During the warranty period they replaced the board ( it blacked out ) and now this is happening. They refused to replace the device saying out of warranty and asked to replace it :-|. They were not even sure that changing the display will fix the issue. I am hesitant to replace the screen as I am better off to buy a new one rather keep repairing the faulty product.



Is there any way to fix it?

Tried
- Reinstall the OS
- External Display = Works fine
- Reseating those 3 cables

Lines kind of flickers, may be some lose cables?

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Please help

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@latv Saw ur replies to me in mail but were disappeared from discussion. Hence, it was never seen. Learned new things as well. I guess apple removed yours as well my comments. Can you msg me on telegram: bitlittlebit

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@yijunlin @jen79010 Hi, I request every one to post the concern on this thread in apple forum, hoping they take some action. Apple support will deny that they are not aware of issue, as no one reported. Forum does n't matter for them. Record that phone call ( it will help you claim your case in court )

STEP 1 : first make a post here :

Feedback - iMac - Apple


Step 2 : Then post your issue here and also mention if you have completed step 1


https://discussions.apple.com/thread/255...

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Will do, thanks for the link.

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Will do, thanks for the link.

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Hello Lat V, I'm having definitely the same problem with you. As I find your post here, I wonder if it is a Quality control issue cuz I bought this iMac in August 2021.

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@yijunlin Yeah Exactly!! I have the same hexagon burning like you. Thing is it will get worse, the portion will get filled up with full lines after few weeks. Apple will deny mistake from their side, it would cost you around 650USD to replace the screen. I plan to buy new one instead of repairing it, they say, they will bill be for further repairs after replacing the display unit, feels scammed. If you need my support any way to act as proof, happy to do so.

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Hey just wanted to know if there’s any update on this, I found that I have the same problem too, on a 2 year old iMac 24” M1. It keeps coming in and out, every now and then and then it seems to be fine, except for a very faint horizontal line. Did anything work for anybody in here?

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In Taiwan, several cases appeared same problem after using iMac for 2 yrs.https://youtu.be/KIuC22KkREE

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I just got exactly the same problem on my M1 IMac which I bought mid 2021 in Singapore. Maybe there are some manufacturing issues with a batch of these iMacs. Such displays should not fail within such short time.

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Looks like we all have the same issues after about 2 years of usage. I have made the purchase in Jan 2022 and now the screen is having same issue as you guys. A barely 2 year old Apple device display failed badly and was also quoted a S$700-800+ S$140(fee for detailed check). This is equivalent to buying a new device. Ridiculous pricing especially since so many of us encounter the same issue.

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To figure this out you need an external display. Does the effect show up on it? If it does the logic board will need replacement, if the image is clean that proves the display is bad.

When did you buy the system? If you know what is your countries warranty period as well.

Where do you live? Country and nearest major city. Also do you have access to an Apple Store as clearly this provider failed you.

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Hi, thank you, External Display => Works fine. I feel it's due to M1 chip, may be I have to apply the thermal paste? The thing is, lines are not fixed, it moves up and down. I am also noticing that it's getting better but very slowly. Some of the top lines are gone.

I live in India, southern side. Apple does not have proper support in here, most of them are third party, they mostly just replace parts. It's an authorized one. Warranty is over, Apple instead of providing a replacement sticks to dump warranty of 1 year. Just in two years I had to replace the entire board and the now this display. Now were near apple standards.

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@latv - Not good😢

Sadly, repasting won’t fix this. The M1 chip is not the problem!

If the external display is fine that points to a bad internal display. You need a new display.

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Thank you, looks like I am stuck with it, apple won't even replace the product. The service guys said they are not sure if it's a display problem, they said they will invoice it after replacing the display. If that's the case I am better of buying a new one. The invoice that I have now is almost the half. That's Apple.

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This GPU drives the external display? Which makes the problem being the faulty display unit?

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@latv - Correct, one graphics engine which pushes the video output to both displays. This is a simple test! While a pain maybe you need to educate him. Bring the system and the external and have him see this.

I swear you’ve proven it! There is no other cause here. Something is messed up with the display it’s self.

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I am having the same problem. I've had this iMac less than two years. These lines appeared a couple weeks ago and have shifted a bit but haven't disappeared. From what I'm seeing online, we are not the only ones experiencing this. This is not right. Apple should be held accountable for this issue.

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@jen79010 Yeah, really making all us run with repairs. Mine has gotten much worse, since posting this.

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Hey @latv, i am from bangalore, india. Having the same issue. What did u do at last? Even visiting store is not ideal given size of this box. Tell ur success/failure story of replacement, so i can visit the authorized store accordingly

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have they fixed it for you? have dropped you a message on tel

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The key reasons for why lines appear on Mac screens are overheating and hardware issues. Sometimes the problem may also be caused by software errors or a combination of both hardware and software malfunctions.Black horizontal lines on the screen can be caused by various factors, such as a faulty Slope unblocked display cable, a damaged LCD panel, or a malfunctioning graphics card. Some possible solutions are: Resetting the System Management Controller (SMC) and the NVRAM. Updating the macOS to the latest version.If additional cleaning is required, slightly dampen the cloth with water or a cleaner intended for use with a screen or display, then wipe the screen. Avoid getting moisture in openings.

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I've got the same issue with the same symptoms: a 2-year-old M1 iMac bought in Singapore. Reported to Apple via the feedback form and posted in Apple Forums.

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Now it started flickering so became very annoying and really unusable.

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Lat V さん、ありがとうございました!
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