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1.83 GHz Core Duo or 1.83, 2, or 2.16 GHz Core 2 Duo A1208 (EMC 2104/2110/2114/2124)

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How do you find the logic board# pertaining to a specific iMac?

I have an iMac 17" Intel core duo. MA199LL/A, Model A1173 EMC: 2104. Serial ends in U2N.

I after much research in the symptoms before this computer died, I have come to the conclusion that the graphics has burnt out.

I believe that I should replace the logic board to get this computer back up and running but I noticed that there are a lot of different logic board numbers out there and I don't know which one pertains to mine. e.g. 820-1919-A, 661-3877 or 820-2052-A 661-4291

how do I go about finding that out or does that even matter?

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Does this look right for your computer:"1.83 GHz Core Duo (T2400)

Intro Date: January 10, 2006 Disc Date: September 6, 2006

Order No: MA199LL Model No: A1173 (EMC 2104)

Subfamily: Early 2006 Model ID: iMac4,1

Std RAM: 512 MB Std VRAM: 128 MB

Std Storage: 160.0 GB (7200 RPM) Std Optical: 8X DL "SuperDrive"


Yes, that looks right to me. How do I go about getting a service manual? or is there no way something like that is available to the general public?


I have over a hundred new logic boards for this model in stock.

Send me your address and I will send you one for free



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silentdrkangel, First off I do have to admit that I am not a Mac person, just a general hardware person, so take my answer with a grain of salt :-) According to your serial number, your computer uses a 1.83Ghz processor. The part number in the service manual list your logic board as 661-3877 which is also 820-1919-A, and is for the early 2006 iMac. Late 2006 iMac used the Logic Board 661-4105, 2.0 GHz 661-4106, 2.16 GHz 661-4290, 2.0 GHz 661-4291, 2.16 GHz. This is due to the Intel Core Duo processor speed ( ICD = Intel Core Duo, 32-bit processor, 820-1919-A, 661-3877 Logic Boards. Memory is 2Gb RAM maximum) and an increase in Ram Intel Core 2 Duo (- IC2D = Intel Core 2 Duo, 64-Bit processor, 820-2052, 661-4291 Logic Boards. Memory is 4Gb RAM maximum). Hope this helps, good luck

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This is great! Thank you, helps me know which one to buy.

The service manual your referring to would have come with my iMac? I assume in disc format? or are you referring to a manual that's available from


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Here is a table of the boards. Linked to some are photos of the boards.

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