Dell Inspiron 13z (N311z, Mid 2011) - Manual (Page 72)

72 I/O Board
10 Lift the I/O board from the computer base.
Replacing the I/O Card
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the I/O board with the I/O slots on the computer base and place the
I/O board on the computer base.
3 Connect the speaker cable and the thermal-fan cable to the connectors on
the I/O board.
4 Replace the system board. See "Replacing the System Board" on page 60.
5 Replace the wireless Mini-Card. See "Replacing the Mini-Card" on
page 36.
1 I/O board 2 Speaker cable
1
2