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iMac G3 Model M4984 Power Supply Replacement

Introduction

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

What you need

  1. iMac G3 Model M4984 Power Supply Replacement, iMac G3 Model M4984 Power Supply Replacement: 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 Power Supply 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 Power Supply Replacement: step 3, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 3, image 2 of 3 iMac G3 Model M4984 Power Supply 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 Power Supply Replacement: step 4, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 4, image 2 of 3 iMac G3 Model M4984 Power Supply 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 Power Supply Replacement: step 5, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 5, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 5, image 3 of 3

    • Remove the power cable from the logic board assembly.

  7. iMac G3 Model M4984 Power Supply Replacement: step 6, image 1 of 2 iMac G3 Model M4984 Power Supply Replacement: step 6, image 2 of 2

    • Remove the front panel connector.

  8. iMac G3 Model M4984 Power Supply Replacement: step 7, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 7, image 2 of 3 iMac G3 Model M4984 Power Supply 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.

  9. iMac G3 Model M4984 Power Supply 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.

  10. iMac G3 Model M4984 Power Supply Replacement: step 9, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 9, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 9, image 3 of 3

    • Now, remove these screws.

    • Now, lift the bottom cover off.

  11. iMac G3 Model M4984 Power Supply Replacement: step 10, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 10, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 10, image 3 of 3

    • 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.

  12. iMac G3 Model M4984 Power Supply Replacement: step 11, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 11, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 11, image 3 of 3

    • 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.

  13. iMac G3 Model M4984 Power Supply Replacement: step 12, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 12, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 12, image 3 of 3

    • Removing the EMI Shield:

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

  14. iMac G3 Model M4984 Power Supply Replacement: step 13, image 1 of 1

    • 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.

  15. iMac G3 Model M4984 Power Supply Replacement: step 14, image 1 of 2 iMac G3 Model M4984 Power Supply Replacement: step 14, image 2 of 2

    • Remove these three screws.

  16. iMac G3 Model M4984 Power Supply Replacement: step 15, image 1 of 3 iMac G3 Model M4984 Power Supply Replacement: step 15, image 2 of 3 iMac G3 Model M4984 Power Supply Replacement: step 15, image 3 of 3

    • 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.

Conclusion

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

Author

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Member since: 09/24/09

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