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  1. Dell Optiplex 745 Motherboard Replacement, Motherboard: étape 1, image 1 de 3 Dell Optiplex 745 Motherboard Replacement, Motherboard: étape 1, image 2 de 3 Dell Optiplex 745 Motherboard Replacement, Motherboard: étape 1, image 3 de 3
    • Orientate the computer so the case lock is on the left corner, like so.

    • Pull the tab that locks the casing in place.

    • While the tab is pulled, lift the casing off the computer.

  2. Dell Optiplex 745 Motherboard Replacement: étape 2, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 2, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 2, image 3 de 3
    • Lift the three tabs locking the face into place. (The plastic prying tool makes this easier.)

    • Pull the plastic face off of the computer.

  3. Dell Optiplex 745 Motherboard Replacement: étape 3, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 3, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 3, image 3 de 3
    • Pinch the two tabs locking the fan mount (annotated in a blue square).

    • Pull the mount up and out of the computer.

  4. Dell Optiplex 745 Motherboard Replacement: étape 4, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 4, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 4, image 3 de 3
    • Pull the orange connector out of the CD drive (annotated in an orange square).

    • Pull out the smaller connector (annotated in a black square). Tweezers make it easier but aren't required.

  5. Dell Optiplex 745 Motherboard Replacement: étape 5, image 1 de 2 Dell Optiplex 745 Motherboard Replacement: étape 5, image 2 de 2
    • Pull the CD drive lock (annotated in blue) straight up.

    • While holding the lock up, pull out the CD drive.

  6. Dell Optiplex 745 Motherboard Replacement: étape 6, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 6, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 6, image 3 de 3
    • Unscrew the two screws (annotated with red circles) holding the GPU heatsync in place.

    • Swing it open then pull it straight up.

  7. Dell Optiplex 745 Motherboard Replacement: étape 7, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 7, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 7, image 3 de 3
    • Unscrew the two screws (annotated with a red circle).

    • Pull out the hinge for the GPU heatsync.

  8. Dell Optiplex 745 Motherboard Replacement: étape 8, image 1 de 1
    • Pull out the yellow and black connector that is connected to the Motherboard.

  9. Dell Optiplex 745 Motherboard Replacement: étape 9, image 1 de 2 Dell Optiplex 745 Motherboard Replacement: étape 9, image 2 de 2
    • Pull out the large white power connector that is connected to the Motherboard.

    • Use the plastic prying tool to pull it up.

    • Alternate sides when prying until it comes loose.

  10. Dell Optiplex 745 Motherboard Replacement: étape 10, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 10, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 10, image 3 de 3
    • Unscrew the three screws (annotated in red).

    • Slide out the AC adapter.

    • If all the cables are detached, it should slide right out. If not, detach the remaining cables.

  11. Dell Optiplex 745 Motherboard Replacement: étape 11, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 11, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 11, image 3 de 3
    • Remove the blue wire connected to the Motherboard.

    • Remove the orange wire connected to the Motherboard.

    • Remove the wide grey connector from the Motherboard.

    • Use the yellow handle to pull it up.

  12. Dell Optiplex 745 Motherboard Replacement: étape 12, image 1 de 2 Dell Optiplex 745 Motherboard Replacement: étape 12, image 2 de 2
    • Remove the last wire connected to the Motherboard.

    • Remove the grey wire connected to the fan.

  13. Dell Optiplex 745 Motherboard Replacement: étape 13, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 13, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 13, image 3 de 3
    • Unscrew the two screws holding the Motherboard down (annotated with the red circles).

  14. Dell Optiplex 745 Motherboard Replacement: étape 14, image 1 de 2 Dell Optiplex 745 Motherboard Replacement: étape 14, image 2 de 2
    • Carefully lift the right side of the Motherboard.

    • After lifting it above the fan, pull it to the right to remove the Motherboard.

  15. Dell Optiplex 745 Motherboard Replacement: étape 15, image 1 de 3 Dell Optiplex 745 Motherboard Replacement: étape 15, image 2 de 3 Dell Optiplex 745 Motherboard Replacement: étape 15, image 3 de 3
    • Starting with the left side, insert the new Motherboard.

    • Once the ports are lined up, set down the right side of the Motherboard.

    • Then screw it back in and reassemble.

Conclusion

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

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James Raymond

Membre depuis le 31/05/2016

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Un commentaire

Thank you and your contributors for providing this guide. I did not replace motherboard but three 2200 u capacitors on it. The thing works again!

Antti Huhtala - Réponse

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