Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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I need to repair my iMac but I’m not sure which parts to buy?

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I have uploaded the image of my iMac packaging label with the details of my order from Apple.

Hope it helps.

Can you help locate the proper tools so that my repair my iMac, please and thank you you in advance!



Update (11/14/2017)

Hey guys!

Thanks for the snarky comments(Lol) and the comments of concern first and foremost..

Well what happened is that my iMac got a spike from and electrical storm at my house.

I had my iMac diagnostic test done and I am told that it's Logic Board got fried and the Power Supply to it.

Luckily I found this amazing website with step by step tutorial photos and all!

Not to mention knowledgeable staff and members that responded quickly to my post. Thank you!!!

I have successfully attached my photo of my computers barcode info of product info, Thanks oldturkey03




I hope all of this helps you out so that you can help me.

Thank you for your time in advance, I will reply ASAP



Answered! View the answer I have this problem too

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Not sure if my image uploaded with this comment. I believe this Mac was purchased in 2013


@macnetic to upload images with your question use this guide Adding images to an existing question


What seems to be the problem?


I was gonna ask the same thing. Hey Aaron, we can’t suggest parts of tools if we don’t have symptoms. You wouldn’t just go to the Emergency Room and stand there. You’d tell the nurse what the problem is.


Well, depends... I know a few psychic nurses, so... bad analogy. :-)


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@macnetic if it is okay with you lets start at some basics. this way we are all on the same page in the same book.

Diagnostic LEDs

The iMac (27-inch, Mid 2010) computer has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. The LEDs are located on the bottom left edge of the logic board (under a piece of black mylar tape) and can only be seen when looking through the lower vents of the enclosure.

Location of Diagnostic LEDs

The LEDs are located under the mylar tape, on the bottom, left corner of the logic board. They can only be seen when looking through lower vents of rear housing

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LED Functions

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LED #1

• Indicates that trickle voltage from power supply has been detected by logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain ON even when computer has been shut down or put to sleep. The LED will remain OFF only if the AC power source is missing or disconnected , if the logic board is disconnected from the power supply, or if the power supply board is faulty.

LED #2

• Indicates that the main logic board has detected proper power from the power supply when the computer is turned on and that logic board voltage regulators are functioning properly. This LED will be ON when the computer is turned on and the power supply should be working correctly.

LED #3

• Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.

LED #4

• Indicates that the computer and the LCD panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the display, then the LCD panel, the LED backlight board, or the cables between might be installed incorrectly or need replacement.

LED Startup Sequence

LED #1 = Power available.

If no LED is visible:

• Verify AC power source

• Verify known-good AC cable is connected

• Verify cable connection between AC inlet and power supply

• Verify cable connection between power supply and logic board

• Verify power supply

LED #1 + LED #2 = Power available, and system is powered on.

If second LED is not visible when power button is pressed:

• Verify power button connection to logic board

• Verify power button functionality

• Verify cable connection between power supply and logic board

• Verify power supply

• Verify logic board

LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.

If third LED is not visible after power on:

• Verify that the MXM video card is seated properly

• Verify if boot chime is present and fans are running when powered ON (reset SMC and PRAM, check backup battery if necessary for proper boot up):

• If POST boot chime is not heard, go to Won’t Start Up symptom flow,

• If POST boot chime is heard, go to No Video symptom flow.

LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found.

If fourth LED is not visible after power on:

• Verify cable connections between LCD panel and logic board

• Inspect LCD display cables for cable damage

• Verify external video functionality, and according to result check the following items:

-If external display works then verify/replace the LED backlight board

-If external display works then verify/replace the LCD panel

-If external display does not work verify/replace the logic board

Logic Board Test Points

Some test points are accessible on the logic board when the LCD panel is removed. The test points are defined below.

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Logic Board Test Point Function

Pin 1 Ground

Pin 3 5V power for Hard Drive(s). Note: If present, the 12V power will come directly from the Power supply to the Hard Drive thru the power harness cable.

Pin 4 Standby 12V power (permanent power coming from power supply and present as long as AC cable is connected, even if computer is off); corresponds to LED #1

Pin 6 Backlight Control pulse width modulated signal (from logic board to LED backlight board, to adjust the backlight level setting according to user setup)

Pin 11 12V Run-Mode power to logic board (coming from power supply, present as long as system is on or asleep); corresponds to LED #2

Pin12 Power On Request signal (from logic board to power supply when power button is pressed)

Pin 13 Backlight Enable (signal from logic board to Backlight Controller board, to enable backlight

Removing the Battery, Measuring DC Voltage

1. Unplug the computer. Allow several minutes for power supply to discharge.

2. Remove logic board.

3. Remove coin battery for 1-2 minutes. The coin battery is located on the back side of the logic board (see graphic below).

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4. Measure DC voltage on battery touching battery with red probe, and grounding with black probe. If voltage is 2.7v or less, replace battery.

5. Reinstall the battery and logic board. This will reset the logic board.

6. Power on computer.

7. If computer boots, check for and install all software and firmware updates.

After all this let us know what you found. If there is any visible damage on your logicboard. Post some images of is with your question. Again, use this guide Adding images to an existing question for that

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Thank you sooo much oldturkey03!!!

But I need to know what tools I need to purchase to open this bad boy.

Can I trouble you with this information as well or anyone who is willing to jump in here with oldturkey03 and me, please and thank you.

I will probably order them for I guess..

Next will check with your very detailed reply oldturkey03 that was too amazing of you to put together , many thanks Sir!

I won't be able to make any moves on this until the weekend and or when the tools list gets posted so I can crack this iMac open and do as you have suggested I do here.

Lol Too excited to get started!!!!

Waiting for your replies.




Oh yes, I will be sure to accept your solution once we are done and give you your much deserved reputation points on your profile, Sir..


Hey, this @oldturkey03 guy is pretty good.


@macnetic no worries about reputation points. It is far more fun to help others. If you check the guides like this one Upgrade iMac Intel Core i3 CPU to Core i7 you see the list of tools needed to get the task accomplished. In your case you would need the Heavy-Duty Suction Cups (Pair) × 2 for the LCD removal and Pro Tech Toolkit. Out of the toolkit you will definitely need a Torx 8 and a Torx 10 driver



Hey there Sir!

Many many thanks to you for your time you took to help me out to post this very detailed post to aid me in getting my iMac outta of the box again!

It has been boxed up for almost a whole year now!

I cannot wait until this weekend to unbox my tools and get this bad boy going again , it will be like Christmas come early Whoo Hoo!!!

Actually I am going to take the time tonight and Thursday to hunt down these tools you told me to get and find the best prices for them and obviously place the order.

I will keep you in the loop on what going on with my progress ASAP.

And you have no vote on the reputation points, it's the least that I could do Sir.

I can't buy you a beer or meal..but I would if I could.

Take care in the meantime, I will be back in touch here real soon.

Hey @mayer I am just as impressed as you are. I was not expecting the detail of oldturkey03 instructions to be so on point and detailed WOW!

Bye for now.


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Aaron Taylor, Jr. will be eternally grateful.
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