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  1. #1
    Does a 17" imac g5 logic board fit a 20" imac g5?

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    Jun 16, 2011
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    Does a 17" imac g5 logic board fit a 20" imac g5?
    I have a 20" Imac g5 rev b with ambient light sensor model number M9845LL/A.
    It was one of the lucky imacs to get shipped with a bad logic board due to failing capacitors. Even though the capacitors show no sign of damage on the logic board aren't swollen though. When I start it up it does not boot and I get no video and the fans are roaring loud to prevent the cpu from overheating. The third and fourth led lights don't light up on the logic board. I tried connecting an external display and the external display gets no video from the Imac g5.

    The serial number of my imac is
    W852220LSDZ.

    I have a couple of questions.

    Is there an apple repair extension program for this specific model of imac g5 since it is no longer under waranty?

    Would a logic board from an imac g5 17" fit into my imac g5 20"?

    Since I have to replace the logic board on it, how about an upgrade,would a intel logic board from an 20" imac fit into the imac g5 20"?

  2. #2
    Does a 17" imac g5 logic board fit a 20" imac g5?
    dtravis7's Avatar
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    If the capacitors are not bulging or leaking I doubt that is the issue. There was at one time a program I believe for boards with Bad Caps.

    The 17" logic board is a lot different. I am sure it will not mount in the 20" iMacs case.

    The Intel board would be way different. It's more like the iMac G5 iSight in basic layout. The ALS was a way different machine inside.

    Is the RAM seated properly? Did you try removing and reinserting the sticks of RAM?

    It could be also a Power Supply issue. All guessing at this point though.

  3. #3
    Does a 17" imac g5 logic board fit a 20" imac g5?

    Member Since
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    thanks for your reply dtravis7.

    I don't see how the logic board has bad capacitors if they are not swollen or leaking either, however some people say they go bad without any visible damage though.

    I am going to check to see if the ram is inserted properly. We'll see if it is. I am going to try to remove and reinsert the sticks of ram and boot it up again and see what happens.

    I doubt the powersupply has an issue because led #2 is on which means the power supply is working correctly.

    Could be anything really.

  4. #4
    Does a 17" imac g5 logic board fit a 20" imac g5?
    dtravis7's Avatar
    Member Since
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    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    I do have the Service Manuals for those machines so if I can look anything up let me know.

  5. #5
    Does a 17" imac g5 logic board fit a 20" imac g5?

    Member Since
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    thank you for the information. If I ever need to remove the logic board by myself I will let you know.

    I checked the ram and was seated properly in its slot. I removed and reinstalled the ram and booted it up and still got the same problem. I even tried installing the ram in the other ram slot and still nothing.

  6. #6
    Does a 17" imac g5 logic board fit a 20" imac g5?

    Member Since
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    are you sure that the logic board from the 17 inch imac g5 is not the same as the logic board from the 20 inch imac g5 as they have the same part number 820-1747-A. Here is a link to the logic board for a 17 inch:Apple iMac 17" G5 820-1747-A Logic Board 2.0GHz Tested Working | eBay

    Here is a link to the logic board from a 20 inch imac g5:imac G5 20

    They have the same part number.

  7. #7
    Does a 17" imac g5 logic board fit a 20" imac g5?

    Member Since
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    imac g5 logic board
    anyone know if the 17 inch imac g5 logic board fits the 20 inch imac g5?

  8. #8
    Does a 17" imac g5 logic board fit a 20" imac g5?
    dtravis7's Avatar
    Member Since
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    Specs:
    iMac late 2007 10.11.b4, iMac 2008 10.10.5, Macbook2007 10.7.5, Mac Mini 10.7.5, iPhone 3GS Note 8!!
    According to the Service Manuals for both:

    For the 20" ALS:
    Logic Board
    661-3613, 2.0 GHz,
    ALS (Ambient Light Sensor)

    For the 17" ALS:
    Logic Board
    661-3611 1.8 GHz
    661-3612 2.0 GHz

    So based on that I would say no. The 17" is a lot smaller machine and I think there are differences in the layout.

    If you want to chance it, above is the info from apples own manuals.

  9. #9
    Does a 17" imac g5 logic board fit a 20" imac g5?
    pigoo3's Avatar
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    Quote Originally Posted by dtravis7 View Post
    So based on that I would say no. The 17" is a lot smaller machine and I think there are differences in the layout.
    Pretty much what I was thinking (different logic board layout = doesn't fit)...but wasn't 100%.

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  10. #10
    Does a 17" imac g5 logic board fit a 20" imac g5?

    Member Since
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    thanks for the reply dtravis7

    Does part number 820-1747-A correspond to 661-3613?

    Dtravis7 Could you send me the service manual for the imac g5?

    thanks

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