Introduction

The iMac uses an incredibly hard to get to power supply. It has 24-Pins. This will require taking the iMac fully apart.

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  • The iMac G3. This was a great computer for the time, and had plenty of features.

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Image 1/1:
  • 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.

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Image 1/3: Using a flathead screwdriver, work your way around the bottom cover, until it comes off. Image 2/3: Then, lift the bottom cover up and out, and set it aside. Image 3/3: Then, lift the bottom cover up and out, and set it aside.
  • 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.

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Image 1/3: It may be helpful to use a Phillips screwdriver to remove the thumbscrews. Image 2/3: It may be helpful to use a Phillips screwdriver to remove the thumbscrews. Image 3/3: It may be helpful to use a Phillips screwdriver to remove the thumbscrews.
  • Now, remove the DB-15 Video connector from the logic board.

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

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Image 1/3: Image 2/3: Image 3/3:
  • Remove the power cable from the logic board assembly.

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Image 1/2: Image 2/2:
  • Remove the front panel connector.

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Image 1/3: Now, grab the logic board assembly by the piece of plastic, and lift it out. Image 2/3: Now, grab the logic board assembly by the piece of plastic, and lift it out. Image 3/3: Now, grab the logic board assembly by the piece of plastic, and lift it out.
  • Now, remove these Phillips screws.

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

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Image 1/1:
  • 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.

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Image 1/3: Now, lift the bottom cover off. Image 2/3: Now, lift the bottom cover off. Image 3/3: Now, lift the bottom cover off.
  • Now, remove these screws.

  • Now, lift the bottom cover off.

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Image 1/3: There isn't a great position to put the iMac in to remove the front bezel. I recommend flipping it so it it like it would normally be positioned. Image 2/3: Remove these two Phillips screws. Image 3/3: Now, work your way around the bezel with a flathead screwdriver, and then, pivot it up towards the top, and remove it.
  • Removing the front bezel:

  • There isn't a great position to put the iMac in to remove the front bezel. I recommend flipping it so it it like it would normally be positioned.

  • Remove these two Phillips screws.

  • Now, work your way around the bezel with a flathead screwdriver, and then, pivot it up towards the top, and remove it.

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Image 1/3: Removal of the front bezel will reveal two screw covers on the top, pop them off with a Phillips screwdriver. Image 2/3: Now, use a Phillips screwdriver to remove the screws. Image 3/3: You can now remove the plastic.
  • Removing the translucent plastic:

  • Removal of the front bezel will reveal two screw covers on the top, pop them off with a Phillips screwdriver.

  • Now, use a Phillips screwdriver to remove the screws.

  • You can now remove the plastic.

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Image 1/3: Remove all 10 of these screws, and lift the EMI Shield off. Image 2/3: Remove all 10 of these screws, and lift the EMI Shield off. Image 3/3: Remove all 10 of these screws, and lift the EMI Shield off.
  • Removing the EMI Shield:

  • Remove all 10 of these screws, and lift the EMI Shield off.

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Image 1/1: Removal of the EMI shield will reveal two major circuit boards.
  • Power Supply:

  • Removal of the EMI shield will reveal two major circuit boards.

  • The Display Driver:

  • The Power Supply:

  • The power supply and driver board are dangerous, if you do not know what you are doing, you could severely injure or kill yourself.

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Image 1/2: Image 2/2:
  • Remove these three screws.

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Image 1/3: AC Power Image 2/3: To System Fan Image 3/3: Don't remove this. It comes free with the logic board power.
  • Now, swing the board out, and remove the following connectors:

  • AC Power

  • To System Fan

  • Don't remove this. It comes free with the logic board power.

  • To Display Driver

  • The connector that is attatched to the logic board; to remove it, simply thread it through the hole in the metal:

  • Now, you should be able to remove the power supply.

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Conclusion

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

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Chris Green

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