Dell Inspiron 17R (5720, Mid 2012) - Manual (Page 76)

76 | System Board
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.
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.
1 Close the display and turn the computer over.
2 Disconnect the subwoofer cable from the system-board connector.
1 subwoofer cable routing 2 subwoofer cable
1 2
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