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Modèle A1312 / Mid-2011 / processeur 2.7 & 3.1 GHz Core i5 ou 3.4 GHz Core i7, ID iMac12,2

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2011 iMac screen goes and stays black

Ready to throw it out the window! I can hear it start up but the screen is black. Took it to get fixed and they reset the LCD cable and it worked at the store got it home and back to black. Now what?

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I took it to another computer store and they had the screen working after reseating the lcd cable. I brought it home still black. Took it back and they said it was the lcd screen.

par

this sounds like the Graphics issue the 2011s have. do you have the AMD 6970M? they had a recall a few months back. you might still be eligible if this is the issue. https://support.apple.com/en-us/HT203787

par

Yes it is a graphic card issue. every year or so I have to do a tear down and bake my graphics card in the oven. Good as new!

par

I have the 2011 iMac 27 inch and in the past few months the black screen problem has started.

I have a second monitor attached and can see that the system is still operating normally, except for the black screen of course.

Hitting the “control shift eject” sequence works as does hitting the sleep tab on the drop down menu on the Apple symbol. To simply bring the main screen back on hitting any key on the keyboard seems to work, especially hitting the “eject” button.

So to me, clearly this is not a graphics hardware related issue, or an over heating one either.

I believe this is an operating system issue, one which I believe Apple could easily identify and fix if they had the best intentions of their loyal customers at heart. Maybe the want people to get so frustrated with the problem that they will go out and buy a new systems, or am I being cynical!!!

It would be interesting to go back to previous versions of the operating systems to see if at any point an update caused the problem to start but I don’t have the time or inclination to try this out.

par

@maus2610 - I would run the onboard diagnostics to see what it tells you.

Restart your system and press the D key

Reference: Mac startup key combinations

Let us know what errors you get.

par

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I bought an iMac with this problem for a good price to solve the problem. I got it temporary worked around, maybe you can try it.

Unplugging the power for a while and putting display brightness to lowest seem to have worked around the problem for a while.

I think the built in power adapter or backlight board is the issue. These are both always powered when plugged in.

This week this workaround didn't work anymore and I'll replace both. I'll let you know what the culprit was.

Dennis van der Pool

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Hey Dennis, just wondering, did you ever replace the power supply and backlight board?

par

Hi Jeroen,

I fixed my problem by replacing the LED backlight board, see details here: Screen backlight goes out randomly.

Gr,

Dennis

par

Yes this method worked for me. but i noticed that this issue has to do with the LCD screen .

To test my theory i loaded a Linux OS on a USB and booted from USB i noticed the screen stayed on without going black

I repeated this for a WIN 7 using bootcamp to install and it still didn't go black

since win7 has issues adjusting the brightness of the screen .

However, the moment you boot into Apple and its on full brightness it would go black after a couple of minutes but if you reduced the brightness to the minimum it would stay on through out.

Am guessing there is a sensor reading in apple OSx that switches this off .

par

The problem got resolved after i replaced the led backlight board. See my other reply above. Works ever since.

par

@dennis just wondered if that fix is still good ?

par

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I may have hacked a solution to the iMac screen, specifically I think the iMac 2011, going dark or just black!

Problem:

I have an iMac 2011 someone donated to me because the screen went dark after brightness of 3 or 4. I’ve used it a long time, but recently its screen just failed to turn on. Tried PRAM, SMC, even fresh copy of High Sierra using an external drive. Nothing.

Potential Hack for others to try, or learn from.

So I got out my older iMac 2009. I use the iMacs for 2nd monitors, using their Target Display capability. I plugged in a DisplayPort cable from the iMac 2009 to my MacBook Pro 2014. Everything is working fine, just using the older iMac. I keep wondering about solving the black screen on the iMac 2011.

So I then shut down the iMac 2009, unplug cables. Get the iMac 2011 up on the desk, plug in the cables, including the DisplayPort to the Macbook, and WOW, up powering up the iMac, the screen came back alive!!! And once the iMac

Please update this community if you test this and find it works, doesn’t or any other information to consider. Here are the steps that worked for me.

Specifics to what I did, not sure what steps could be modified, clarified, or removed, but this is what I did. Posting hoping this leads to a good hack for others to revive older iMacs. Please test and comment for others to learn more.

  1. Had iMac 2009 with DisplayPort only capability, connected to a MacBook Pro 2014 with TB2 capability, using a DisplayPort cable.
  2. iMac 2009 was being used in Target Display to the MacBook Pro.
  3. Shut down the iMac 2009, disconnected all cables (Power, keyboard, mouse, DisplayPort)
  4. Left the MacBook running with DisplayPort Cable plugged in and was connected to iMac in TargetDisplay mode when the iMac shutdown.
  5. Put iMac 2011 where iMac 2009 was, connected all the same cables.
  6. Powered on iMac 2011…. And….
  7. SCREEN TURNED ON !!! Somehow, the dead screen was on, and able to go to FULL brightness, not turning off after 3 or 4 in brightness. It has stayed at full brightness for a couple hours now.
  8. Thoughts: My gut has always said this would need a hardware fix, but somehow these steps triggered the screen’s power to work correctly. I think it will stay on until some odd event triggers the old behavior. For now, these steps worked to revive the iMac 2011 screen.
  9. Observations for consideration:
    • Somehow the displayport cable, with the MacBook looking for the iMac 2009 in Target Mode, triggered the iMac 2011 screen to come on.
    • MacBook was expecting an iMac to be connected via TargetDisplay mode over the Dip
    • Once the iMac screen was working fine, the Target mode would not (does not) work with DisplayPort cable. But it was the DisplayPort cable that seemed to trigger the screen in the 2011’s Thundebolt 2 port.
    • Once the screen was working, I replaced the DisplayPort cable with a TB2 cable, and then TargetMode worked fine, and at full brightness.
    • Q: Did the DisplayPort cable, between two TB2 machines, cause some electrical signal, pulse, that reset the video board, power board, on the iMac? Or some “loss” of signal expected? I don’t know, but it seems this is what happened.
    • This issue seems to behardware related. I was never able to solve this with any software solution, or PRAM, SMC reset. Even tried a freshly installed High Sierra using external USB hard drive.
    • I hope this “hack” will help others.
    • My iMac 2011 is working great at full brightness again. If it goes dark, I’ll post here again.
  10. Outcome: I now have an iMac 2011 who’s display was dead, and revived like its new.

Hardware used:

MacBook Pro 2014 i7 / Big Sur (TB2 compatible)

iMac 2009 27” i7 / High Sierra (DisplayPort only)

iMac 2011 27” i7 / High Sierra (TB2 compatible)

Cables: Thunderbolt 2, DisplayPort.

If you need further help, reach out to me - email Paul at bettercaulpaul.tech.

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I fixed it by replacing the faulty GPU. Same issue; only video at the external video output.

I tried another LCD, inverter and powersupply. No succes, so I replaced it with a K1200M with custom firmware.

for this issue it’s crucial to know if the external screen is attached as secondary or primary.

logon screen at secondary screen: LCD is not being. Initialized due to loose connection.

I found out troubleshooting that the external screen is mounted as primary when I disconnect the internal lcd partially.

The external screen get primary if the internal lcd is not connected right. if you get a loginscreen at the external screen, this might indicated a loose connection.

with the logon screen on the faulty internal LCD you will get a blurred background visible on the external. In my situation this was a result of a faulty GPU that didn’t feed the internal LCD properly.

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So I managed to reset my black screen to normal on my 2011 27 inch imac simply by using a labtop in target disk mode to boot up the imac.

1 Put your macbook into target disk mode and connect to imac using firewire or thunderbolt 2

2 boot imac holding down the alt key

3 choose to boot from your laptop drive

4 it should work

5 shut down and disconnect laptop then boot as normal

6 if it doesn't work either try baking or swapping you graphics card or just give up and throw your imac out of the window in a berserker rage

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kristin sera éternellement reconnaissant.
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