Black horizontal lines on iMac M1 Ventura

I have the same problem.

Apple doesn't want to help.

They should replace our screens for free.

I have the same issue and they told me "If it becomes a thing, then you'll be refunded retroactively for the cost of your repair".

Apple should replace our screens by free.

My 2021 M1 iMac recently had the same problem, the top part of the display now just flickers constantly. No help from Apple Care Support, just an out of warranty cost of £637, in the UK. They point-blank refused to admit this might be another case of "Butterfly Keyboard" problems. I was told, "If it becomes a thing, then you'll be refunded retroactively for the cost of your repair". Sounds to me like they know exactly the issue at hand.

Facing the same issue too. Please be-careful when examining the screen. Mine is having a weird black dot at the side of the screen where the lines starts. It is extremely hot, and it burn my finger. Turning this dam thing off forever.

I have no idea where you'd get another cable if that was the case...

https://www.youtube.com/watch?v=-WtGjkgIXGM

And since Apple designed it not to be serviceable, for more info Google for...

imac m1 takeapart

PS, I was pretty proud of that diagnostic when it came to me in my sleep around 20 years ago. :D

Having the same issue. So far I've taken my iMac to the apple Service center as suggested from the first contact the apple support. They did determine it was an issue with the display and I showed them all the details from this forum that it's a manufacture defect. The manger at the apple store told me to contact tier 2 support for an approval code which I called but they were of no help even explaining the issue and the numerous amount of iMac M1 owners having this issue. The thing is some people have received the approval code and have had their iMac screen replaced even though it was just out of the warranty. So I don't understand this, some get fixed and some don't. I'm still trying to get some result to this manufacturers defect.

I saw this one comment from this thread that was experiencing the same problem as you:

thread:Persistent horizontal lines appear on iMa… - Apple Community

I tried to research teardown videos of the IMac 2021 and I think the author does have a point. The LCD screen was like screwed shut? It only has like 2 ports for the camera and screen itself from the outside. I haven’t seen a single video wherein they tried to open the screws from the LCD. So if you even want to know whats causing the problem, it’s impossible since it’s inaccessible.

I'm also having the same issue with the horizontal lines just after the warrantee. Like so many others that have posted about this manufacturing defect from apple. I had brought my iMac into the apple service center and they have determined the issue as being a defect but they could not proceed further without an authorization code from tier 2 support. On the apple forum others have received the authorization on this issue but it seems to be a hit or miss as when I called to explain the situation to at Tier 2 support, I was told there was nothing they could do. A person on the apple forum from July had an approval for their screen replacement from this manufacture defect.

I haven't heard of others with this issue.:(

Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.

All you can do is send it in for repair, and make sure to tell Apple about the problem:

Product Feedback - Apple

Hello everyone, I also have the problem of horizontal lines on the screen, which suddenly appeared immediately after the end of the warranty.

[Edited by Moderator]

There’s a lot of people actually experiencing this including me. Here’s the thread: Persistent horizontal lines appear on iMa… - Apple Community