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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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Stage Light Effect iMac 27 inch

I have seen a lot of posts regarding the stage light effect on the MacBooks, but I have a 27 inch iMac that had the same issue for about 2 weeks. It was sporadic, as sometimes it would be there and others not. Today the screen is totally black. Is the stage light effect indicitive of what the cause of the display going black might be?

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Can yo give us your exact model as the different series use different parts.

On the bottom of your stand you'll find the S/N, plug it into here EveryMac - Lookup let us know what you find.

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Thanks Dan,

I will look into replacing the LED Logic Board, seems like a simple procedure if I can locate the right board.

My iMac is:

A 1312 ( 2.7 GHz - i5 )....

Everything that I could find about the stage light effect was related to the powerbooks - nothing for the iMac. Weird??

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Yes, that’s it.

I have another question maybe you can answer... I about to buy a new iMac (the 2011 model is getting pretty tired and I bought it used and cheap anyhow).

But in order to transfer my files I need to be able to see the old iMac to set up Migration Assistant. I have an HD monitor ( TV ) that I can use. The port on the iMac is a Thunderbolt - but all I can find is a USB-C to HDMI adapter (the USB-C is the same size as the Thunderbolt port)

Do you think this will work in order to use the TV as a monitor temporarily?

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The USB-C (Thunderbolt3) is not compatible! The connector is still different than what your iMac has. You need either a miniDisplayPort or a Thunderbolt 1 or 2 adapter.

Here's one source of the needed adapter Mini DisplayPort-to-HDMI Adapter

An alternative way is not using any display! Instead re-start your system in Target Disk Mode by restarting the system and pressing the T key on your keyboard.

Reference: Mac startup key combinations

Don’t forget to score the answer and accept it.

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The stage-light effect is caused by either the LED driver failing or the cable connection to the display assembly. Rarely is it the display its self in the iMac’s. The only time I’ve seen a bad display is when someone damage it.

The more common issue is the LED driver logic is failing and as you’ve lost the backlight fully now that’s what I focus in on.

Update (09/07/2019)

Here’s the needed part Backlight LED driver board Apple P/N 661-5980

iMac Intel 27" EMC 2429 LED Driver Board Replacement

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Thanks Dan!!

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Hello. I’ve never seen this on an iMac before. If the computer turns on but the screen stays black then you’ve probably got a broken LCD. If you don’t have a warranty then you could try replacing the LCD.

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