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모델 A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 또는 3.1 GHz Core i7 프로세서

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screen appear lines vertical and horizontal it seems like GPU fail?

Could i replace GPU in my IMac late 2012 or it’s fixed in the mainboard so there is no way to fix or replace it in this mode A1418 imac late 2012

Update (11/05/2018)

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This is what appear in my screen

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Can you post a picture or two on what you are seeing on the screen so we can be sure what your issue is. Adding images to an existing question

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@shadyahmed - Sorry guy your issue is a bad display! Not a logic board issue.

The bars are caused by a broken LCD screen. In fact, I think I can see the point of contact and a crack in the right midpoint. Did the system fall over or something thrown at it? Or did it get shipped to you and got damaged then?

Here’s the IFIXIT guide you’ll need to follow: iMac Intel 21.5" EMC 2544 Display Replacement and here’s the needed part: TheBookYard UK - iMac 21.5" LCD Panel & Front Glass Assembly - Grade-C, Apple P/N 661-7109 and you’ll need this toolkit and tapes iMac Intel 21.5" (2012-2019) Adhesive Strips Make sure you follow the IFIXIT guide don’t jump ahead as the process of taking off the display as you don’t want fragments falling off.

iMac Intel 21.5" (2012-2019) Adhesive Strips 이미지

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iMac Intel 21.5" (2012-2019) Adhesive Strips

$19.99

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Thank u Very much :)

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my imac screen fall and screen glass get damage but it was fine untill i change it with new one , then it become like this from few days , and i don't know this is only screen issue or something new , but i will try to change Glass screen and see if it works

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Sounds like it was damaged before hand. You can also damage it in the take off process if one doesn't use the proper tools and technique as outlined in the guide.

So it could be both! The person who sold you the display didn't use the proper tool and in shipment to you it get poked cracking the display.

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shady 가/이 대단히 고마워 할 것입니다.
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