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iMac G5 20" Model A1076 Inverter Replacement

iMac G5 20" Model A1076 Inverter Replacement

Walter Galan

Walter Galan and 6 other contributors

Last updated on April 25, 2024

No estimate
Moderate

Introduction

Go to step 1

Use this guide to replace your display inverter.

What you need

Parts

Tools

  • Phillips #1 Screwdriver
    Phillips #1 Screwdriver
  • Spudger
    Spudger

Show more…

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  1. iMac G5 20" Model A1076 Inverter Replacement, Rear Panel: step 1, image 1 of 1

    • Lay the iMac display-side down on a flat surface (putting a cloth under the screen to protect it from bumps).

    • Loosen the three Phillips screws securing the rear panel to the iMac.

    • These screws are captive in the iMac. The center screw will stop turning after about 3.5 turns and the outer screws will stop turning after about 5.5 turns. Do not try to remove these screws from your iMac.

    Edit

  2. iMac G5 20" Model A1076 Inverter Replacement: step 2, image 1 of 2 iMac G5 20" Model A1076 Inverter Replacement: step 2, image 2 of 2

    • Lift the rear panel slightly near the bottom of the iMac.

    • Pull the rear panel toward yourself and remove it from the iMac.

    Edit

  3. iMac G5 20" Model A1076 Inverter Replacement, RAM: step 3, image 1 of 2 iMac G5 20" Model A1076 Inverter Replacement, RAM: step 3, image 2 of 2

    • Rotate each of the two RAM retaining arms away from the RAM chip.

    • The chip will partially pop out at the same time as the arms are pulled out to either side.

    • Pull the RAM chip straight away from its socket.

    • Repeat this process for the other RAM chip.

    • Be sure the RAM arms are rotated fully outward before installing new RAM chips.

    Edit

  4. iMac G5 20" Model A1076 Inverter Replacement, Inverter: step 4, image 1 of 1

    • Remove the following three screws securing the inverter to the chassis:

    • Two 7.9 mm Phillips.

    • One 26 mm Phillips.

    • When reinstalling the inverter, be careful to route the purple and black cables around the screw mount. It is very easy to pinch the cable and damage the insulation.

    Edit

  5. iMac G5 20" Model A1076 Inverter Replacement: step 5, image 1 of 2 iMac G5 20" Model A1076 Inverter Replacement: step 5, image 2 of 2

    • Slide the inverter toward the edge of the mid-plane, then lift it out of the iMac.

    • Be careful to not pry up against the RAM brackets.

    • When reinstalling the inverter, press the blue and white cables down in the edge of the midplane before lowering the inverter down into the midplane. The black cable can be routed near the hard drive thermal sensor cable.

    Edit

  7. iMac G5 20" Model A1076 Inverter Replacement: step 6, image 1 of 1

    • Disconnect the large inverter cable connector from the inverter by pulling straight away from its socket.

    Edit

  8. iMac G5 20" Model A1076 Inverter Replacement: step 7, image 1 of 1

    • Disconnect the small inverter cable connector by pulling it straight away from its socket.

    Edit

  9. iMac G5 20" Model A1076 Inverter Replacement: step 8, image 1 of 1

    • Disconnect the hard drive thermal sensor cable from the thermal sensor board on the hard drive bracket by pulling the cable away from the heat sink.

    Edit

  10. iMac G5 20" Model A1076 Inverter Replacement: step 9, image 1 of 1

    • Gently pull the black inverter cable to disconnect it from the logic board.

    • If you have trouble plugging this cable back in during reinstallation, remove the fan duct for more room to work.

    Edit

  11. iMac G5 20" Model A1076 Inverter Replacement: step 10, image 1 of 1

    • Flip up the inverter cable cover from its left edge and lift it out of the chassis.

    Edit

  12. iMac G5 20" Model A1076 Inverter Replacement: step 11, image 1 of 1

    • De-route the inverter cables from the inverter cable cover hook.

    Edit

  13. iMac G5 20" Model A1076 Inverter Replacement: step 12, image 1 of 3 iMac G5 20" Model A1076 Inverter Replacement: step 12, image 2 of 3 iMac G5 20" Model A1076 Inverter Replacement: step 12, image 3 of 3

    • Remove the inverter cables from the inverter cable cover, and disconnect both connectors.

    Edit

  14. iMac G5 20" Model A1076 Inverter Replacement: step 13, image 1 of 2 iMac G5 20" Model A1076 Inverter Replacement: step 13, image 2 of 2

    • If you wish to replace just the inverter board, use a spudger to pry off its plastic cover.

    Edit
Conclusion

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

4 other people completed this guide.

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