Dell OptiPlex 7440 All-In-One Owner's Manual

Removing the system board

1. Follow the procedure in Before Working Inside Your Computer.
2. Remove the:
   1. stand
   2. back cover
   3. cable cover
   4. speaker cover
   5. VESA mount bracket
   6. system-board shield
   7. memory
   8. optical drive
   9. hard drive
   10. heatsink
   11. power-supply unit
   12. converter board
   13. processor fan
3. Perform the following steps as shown in the illustration:
   1. Disconnect the optical-drive cable and hard-drive cable from the connectors on the system board [1].
   2. Disconnect the touch pad cable from the connector on the system board [2].
   3. Unthread the cable from the retention clips of the computer [3].
   
4. Perform the following steps as shown in the illustration:
   1. Remove the screws that secure the optical-drive cable and hard-drive cable to the system [1].
   2. Disconnect the optical-drive cable and hard-drive cable [2].
   
5. Disconnect all the cables that are connected to the system board.
   
6. Perform the following steps as shown in the illustration:
   1. Press the latches on either side of the connector and pull the LVDS cable to disconnect it from the system board [1,2].
   2. Lift the latch and disconnect the cable from the connector [3,4].
   
7. Perform the following steps as shown in the illustration.
   1. Remove the screws that secure the system board to the chassis [1].
   2. Slide the system board and lift it away from the chassis [2].