Dell Precision 3660 Manuel De Maintenance page 76

NOTE: Your computer's Service Tag is stored in the system board. You must enter the Service Tag in the BIOS setup program
after you replace the system board.
NOTE: Replacing the system board removes any changes that you have made to the BIOS using the BIOS setup program. You
must make the appropriate changes again after you replace the system board.
NOTE: Before disconnecting the cables from the system board, note the location of the connectors so that you can reconnect
the cables correctly after you replace the system board.
2. Remove the side cover.
3. Remove the front bezel.
4. Remove the fan duct.
5. Remove the memory module.
6. Remove the WLAN.
7. Remove the M.2 2230 SSD/M.2 2280
8. Remove the coin-cell battery.
9. Remove the graphics card.
10. Remove the powered GPU.
NOTE: This step is required only if the system is configured with powered GPU.
11. Remove the internal speaker.
12. Remove the intrusion switch.
13. Remove the 125 W heat-sink assembly
14. Remove the front chassis fan
15. Remove the liquid cooler.
16. Remove the processor.
About this task
The following image indicates the connectors on your system board.
76 Retrait et installation de composants
SSD.
or 65 W heat-sink
and rear chassis fan.
assembly.