Dell Inspiron 15R Owner's Manual page 51

Procedure
NOTE: Your computer's Service Tag is stored in the system board. You must enter
the Service Tag in the BIOS after you replace the system-board assembly.
NOTE: Before disconnecting the cables from the system board, note the location
of the connectors so that you can reconnect them correctly after you replace the
system-board assembly.
Remove the screws that secure the power-adapter port bracket to the computer
1
base.
Lift the power-adapter port bracket off the computer base.
2
1
2
1 screws (2)
50
| System Board
2 power-adapter port bracket