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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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Should I replace logic board or buy new machine?

Hi,

I’m hoping for some advice from knowledgable people regarding a fault on my late 2014 27” iMac Retina.

Using it a few days ago the screen went totally grey. I restarted and it wouldn’t load, getting stuck about three quarters of the way on the Apple loading icon.

I could start in Safe Mode and there were big lines down the screen:

Block Image

Did a repair run on with Disk Utility and no errors found.

Tried updating to Mojave (was running High Sierra) and still no joy.

Took it to Apple who said the following:

“Verified hardware failure, no signs of misuse but out of warranty. Requires logic board repair as graphics part of board seems to have failed .”

For them to repair it’s £580 plus vat, something which I think is mad to pay to repair a machine that’s 4.5 years old. Plus that only gives me a 90 day warranty apparently.

Does anybody know how easy/hard this would be to repair? I took it to a computer repair shop and they said they can’t do it as it’s too hard to get the screen off without cracking it...

If it’s a big thing to repair I’ll have to buy a new one but that’s really out of my reach at the moment unless on finance but I’d really rather repair than replace if it’s not too costly. It was working very well for me ahead of this issue.

AMD Radeon R9 M290X 2048 MB graphics is what it is.

Thanks for your time!

Helen

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I’ll be honest I not sure if you need a new logic board or display here. Often when we see GPU errors we see a full screen of colored blocks as the coding of the signal gets messed up within it. When we see bars like this which is a incomplete coding of the image space it’s often the video RAM where a RAS or CAS line within a chip has failed. This could be as simple as re-soldering the chip as the solder joint had failed (marked in Yellow here and the GPU is in Red)

Block Image

The last possibility is the custom T-CON board on the backside of the display.

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Lets see if we can reduce which it is. I would plug in an external monitor to see if the problem is visible on it. If its not then we know its not the GPU or the V-RAM so replacing the logic board would not fix this. Then all we really need is to replace the display its self. I’m sure you could even do that your self ;-} with some help from us!

For reference:

Imagem de iMac Intel 27" Retina 5K Display Display

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iMac Intel 27" Retina 5K Display Display Replacement

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30 - 45 minutes
Imagem de iMac Intel 27" Retina 5K Display Logic Board

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iMac Intel 27" Retina 5K Display Logic Board Replacement

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2 hours

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Thank you Dan, my husband is bringing home a thunderbolt adapter so that I can try it out through my TV later, I’ll keep you posted :)

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