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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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Backlight dim in a part of the screen

I have received an Imac of a client, that has a backlight dim in one sector of the screen as you can see in the picture. I guess is a faulty LCD panel, but if you have another suggestion it will be welcome. Thank you

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Отвечено! Посмотреть ответ У меня та же проблема

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I'm having a very similar issue with my 2011 27" iMac, same model.


What if you don't have that model? Options?


That is the "6 wire" connector on the left LED strip. The socket comes loose on the LED strip. You can pull out the cable, solder onto the LED board, then solder those wires to the LED cable socket, then plug in the cable. I have photos of this, plus there are two guys that show the procedure. Both methods work, the "6 wire" solder method does not require you to dismantle the display. Here is the link to buy new LED strips 310mm LED Backlight Lamp strip bar 36leds For Apple 27" LCD LM270WQ1 SD C2 MB270B2U SDA2 SDB1 SDE3 SDE5 SDF1 LGT2781 LGT2795

Link to the 6 wire repair: https://www.youtube.com/watch?v=gSzmyqQF... Good luck, both work.


I have an iMac mid 2010 27 in. The issue started with screen one side darker, right side lighter. Then later started to dim both sides. Then if I press the brightness beyond 4 clicks it would go dark. Until, all dark. This all happen 2018. I used an external monitor for two months with iMac. Solution: ordered backlight inverter board online for $22 last week. Seller stated it’s been tested. Installed today. It worked! Brightness level maximum, a success. I read online some replace inverter with no success, but! What if that inverter was damage, as well? I would buy one that was tested and able to return. Good luck.



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Выбранное решение

It is not a graphic issue. What's a strange solution? It is definitely not a graphic card. Of course, it is possible to fix it but it is very hard.

1. In all cases that I had only the left side of the screen was not working.

2. When I dissembled it I noticed that it faulty lcd panel (factory defect). I can explain what I mean. It appeared that all pins of the plug-in on the left side of the backlight lamp are not in the right position. For example, pin 1 on the place of pin 2, pin on the place of pin 3 and so one.

3. That's why, in order to repair it you should dissemble all screen and solder backlight plug-in anew. And it is very hard. I have spent 3 hours to repair it. And you also should be very careful not to damage lcd screen and other parts of the screen.

Next time I can make tutorial how to fix it if someone still need it.

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Did you by chance ever make that video?


yes what she said, there are still a bunch with the same backlight issue.


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Hook it up to an external monitor to test. There was a repair program on the 2011 GPU on your series of machine and we can address that after you have checked it.

Please give us the last four figures of your serial number so I can check it out for this:

iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program

Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac computers with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors may fail, causing the computer’s display to appear distorted, white or blue with vertical lines, or to turn black. iMac computers with affected video cards were sold between May 2011 and October 2012.

If your iMac has an AMD Radeon HD 6970M video card and is exhibiting any of the issues described above, choose one of the following options to arrange to have your iMac evaluated:

Before you go in for service, please back up your data. Learn more about backup options.

If the iMac (27-inch) meets these requirements, Apple will replace the video card free of charge for four years after the first retail sale of the computer.

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Hi mayer, the last digits of serial number are DHJQ.


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ebay seller “return-of-themac” has NVIDIA Quadro K610M 1GB 745325-001 with custom mac firmware so you can see boot screen at startup i3,i5,i7 cpu only (no default brightness adjust, unless 3rd party app), works great on both of my iMac 27” 2010 and 2011, also works windows 11 on iMac

£119.99 uk

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