Horizontal lines over iMac 24 screen

@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.

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?

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

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.

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.

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.

@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.

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.

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

@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.

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

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

Yes issue for me. Don't open the iMac, it's a display issue. The heating is happening at the connector. Do this instead, don't open, apple maintains a monopoly in repair business for apple products in India, no spare parts is available.

Heating is going to happen at multiple points and the lines are going to show up 3 positions. It will shift.

File a consumer case with proof of screenshot from others. Use an external display until case the solved.