Dell Vostro 470 (Mid 2012) - Manual (Page 33)

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Removing The System Board
1. Follow the procedures in Before Working Inside Your Computer.
2. Remove the cover.
3. Remove the memory modules.
4. Remove the expansion card.
5. Remove the heat sink.
6. Remove the processor.
7. Remove the hard drive.
8. Remove the optical drive.
9. Remove the memory card reader.
10. Disconnect and unthread all the cables on the system board.
Figure 32.
11. Remove the screws that secure the system board to the computer chassis.
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