27" iMac display controller boards

Now that my 2010 27" iMac is dead after suffering grafx card issues, im thinking to make it work as a standalone display. Its not that hard, but u have to connect the iMac's display to a controller board and your good to go.

The procedure is to connect a controller board to the display, that will be able to control and modify its settings (brightness, contrast etc.) and in the end the users will have the iMac as a standalone display!

There are cases that users have experienced low brightness issues. It is said that maybe Apple has encrypted those displays and its controls to prevent secondary modifications.

Is that true?

Earlier Mac models

Posted on Jun 16, 2023 2:01 PM

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Posted on Jun 17, 2023 9:46 AM

if you don't understand the point, you probably don't have the expertise needed to pull off the project that you are proposing.


If there was encryption to lock out people from reusing the LCD panel – as opposed to encryption for the purpose of appeasing Hollywood movie studios – hardware hackers who "brought their own controller boards" would have seen NO PICTURE AT ALL. Their controller boards wouldn't have known the encryption keys which the LCD panels were using to lock down EVERYTHING.


If they saw a picture, but "simply" couldn't control the brightness and contrast settings very well, that suggests that the LCD panels were unlocked, but that their home-brew controllers were only PARTIALLY compatible with the reused panels.



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Jun 17, 2023 9:46 AM in response to genikifor

if you don't understand the point, you probably don't have the expertise needed to pull off the project that you are proposing.


If there was encryption to lock out people from reusing the LCD panel – as opposed to encryption for the purpose of appeasing Hollywood movie studios – hardware hackers who "brought their own controller boards" would have seen NO PICTURE AT ALL. Their controller boards wouldn't have known the encryption keys which the LCD panels were using to lock down EVERYTHING.


If they saw a picture, but "simply" couldn't control the brightness and contrast settings very well, that suggests that the LCD panels were unlocked, but that their home-brew controllers were only PARTIALLY compatible with the reused panels.



Jun 17, 2023 11:39 AM in response to genikifor

"I doubt it." >>> I don't think it's encrypted


"Encryption would likely be no go at all". >>> If it were encrypted you wouldn't be able to do anything. No Go mean "Not Going to happen.


"The fact you can use it in the manner you describe means no encryption I'm thinking." >>> The fact some people are successful with dim images means it's not encrypted.

Jun 17, 2023 10:26 AM in response to Allan Jones

Why get Zapped? Its not like im trying to get round of a new product. Its an old great display, on a great old computer (iMac) that Apple has stopped supporting (its a pity Apple won't provide new grfx cards) and im trying to use that old great piece of technology in a different way.

If you come to think of it, im still honouring Apple and its product by still trying to use a discontinued product, why would i get zapped for that?

Jun 17, 2023 11:47 AM in response to genikifor

There's nothing wrong with a project computer. I have a 2015 21.5" iMac I consider a "project". But what you're talking about is less of a user thing and more of a technician thing. I'd guess 99.99% of the users who come here are not in any way proficient at doing what you want to do. It's just not the focus of this community.

Jun 17, 2023 3:16 PM in response to genikifor

genikifor wrote:

I cant just put to the rubbish can, a great working display! Can you?


I still have all of the Macs that I ever owned – going back to a Mac Plus (that started life as a 128K Mac, before installation of the upgrade kit).


As far as I know, they're still (mostly) in working order, though by now, the ones that are in storage might need replacement of clock/PRAM batteries. But most would only still be worth turning on for games (which tend to get orphaned by their vendors) or as a matter of historical curiosity.


Given that your 27" 2010 iMac is dead – and that you can buy a good, modern, pre-assembled 27" 2560x1440 monitor for $315 to $350 – I'm not sure that it makes sense to spend a lot of time on an electronics project that you do not yet seem qualified to undertake.

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27" iMac display controller boards

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