Skip to main content

iMac G3 Model M4984 Logic Board Replacement

What you need

  1. iMac G3 Model M4984 Logic Board Replacement, Logic Board: step 1, image 1 of 1
    • The iMac G3. This was a great computer for the time, and had plenty of features.

  2. iMac G3 Model M4984 Logic Board Replacement: step 2, image 1 of 1
    • Start by flipping the iMac upside-down. It may help to lay it on a towel, so you don't damage the screen, or scratch the face.

  3. iMac G3 Model M4984 Logic Board Replacement: step 3, image 1 of 3 iMac G3 Model M4984 Logic Board Replacement: step 3, image 2 of 3 iMac G3 Model M4984 Logic Board Replacement: step 3, image 3 of 3
    • Remove this Phillips screw.

    • Using a flathead screwdriver, work your way around the bottom cover, until it comes off.

    • Then, lift the bottom cover up and out, and set it aside.

  4. iMac G3 Model M4984 Logic Board Replacement: step 4, image 1 of 3 iMac G3 Model M4984 Logic Board Replacement: step 4, image 2 of 3 iMac G3 Model M4984 Logic Board Replacement: step 4, image 3 of 3
    • Now, remove the DB-15 Video connector from the logic board.

    • It may be helpful to use a Phillips screwdriver to remove the thumbscrews.

  5. iMac G3 Model M4984 Logic Board Replacement: step 5, image 1 of 3 iMac G3 Model M4984 Logic Board Replacement: step 5, image 2 of 3 iMac G3 Model M4984 Logic Board Replacement: step 5, image 3 of 3
    • Remove the power cable from the logic board assembly.

  6. iMac G3 Model M4984 Logic Board Replacement: step 6, image 1 of 2 iMac G3 Model M4984 Logic Board Replacement: step 6, image 2 of 2
    • Remove the front panel connector. (You may also need to remove an additional screw that connects the front panel connector to the logic board assembly).

  7. iMac G3 Model M4984 Logic Board Replacement: step 7, image 1 of 3 iMac G3 Model M4984 Logic Board Replacement: step 7, image 2 of 3 iMac G3 Model M4984 Logic Board Replacement: step 7, image 3 of 3
    • Now, remove these Phillips screws.

    • Now, grab the logic board assembly by the piece of plastic, and lift it out.

  8. iMac G3 Model M4984 Logic Board Replacement: step 8, image 1 of 1
    • The logic board assembly. This is the heart of the computer, it contains the motherboard, CPU, RAM, V-RAM, PRAM battery, the hard drive, and the optical drive.

Conclusion

To reassemble your device, follow these instructions in reverse order.

11 other people completed this guide.

Chris Green

Member since: 10/11/09

36,876 Reputation

49 Guides authored

Team

Master Techs Member of Master Techs

Community

322 Members

2,506 Guides authored

One Comment

Just did this on my Grape 333 Mhz and on my Lime 333 Mhz which come from from the same place. Actually, I'm surprised that the Grape's logic board has a white IrDA connector which its twin doesn't have...

Nicolas Zbinden - Reply

Add Comment

View Statistics:

Past 24 Hours: 1

Past 7 Days: 9

Past 30 Days: 58

All Time: 18,470