Inspiron 7400 Service Manual

Installing the system board

1. Align the I/O ports on the system board to the I/O port slots on the palm-rest and keyboard assembly.
2. Using the alignment posts, slide and at angle and place the system board on the palm-rest and keyboard assembly.
3. Replace the screw (M2x2) that secures the system board to the palm-restand keyboard assembly.
   NOTE This step only applies to computers shipped with a 6-cell (78 Wh) battery configuration.

   NOTE Do not replace the screw in the location marked Inspiron 7300.
4. Connect the power-adapter port cable to the connector on the system board.
5. Connect the speaker cable to the connector on the system board.
6. Connect the keyboard cable to the connector on the system board and close the latch.
7. Connect the keyboard-backlight cable to the connector on the system board and close the latch.
8. Connect the touchpad cable to the connector on the system board and close the latch.
9. Connect the I/O-board cable to the connector on the system board and close the latch.
10. Adhere the tape that secures the I/O-board cable connector latch to the system board.
11. Connect the fingerprint-reader board cable to the connector on the system board and close the latch, if applicable.
12. Connect the coin-cell battery cable to the system board.
13. Connect the antenna cables to the wireless card on the system board.

    The following table provides the antenna-cable color scheme for the wireless card supported by your computer.

    Table 1. Antenna-cable color schemeThe following table provides the antenna-cable color scheme for the WLAN card of your computer.

    Connectors on the wireless card	Antenna-cable color	Silkscreen marking
    Main	White	MAIN	△ (white triangle)
    Auxiliary	Black	AUX	▲ (black triangle)

14. Place the wireless-card bracket on the wireless card.
15. Replace the screw (M2x2.5) that secures the wireless-card bracket to the system board.
16. Close the right-display hinge and align the screw holes on the right-display hinge with the screw holes on the palm-rest and keyboard assembly
17. Replace the two screws (M2x4) that secure the right-display hinge to the palm-rest and keyboard assembly.
18. Connect the display cable to the system board and close the latch.
19. Adhere the tape that secures the display-cable connector latch to the systemboard.