Dell Inspiron 14 N4120 User manual

Dell™ Inspiron™ N4110
Service Manual
Regulatory model: P20G Regulatory type: P20G001

Notes, Cautions, and Warnings
NOTE: A NOTE indicates important information that helps you make better use of
your computer.
CAUTION: A CAUTION indicates potential damage to hardware or loss of data if
instructions are not followed.
WARNING: A WARNING indicates a potential for property damage, personal
injury, or death.
____________________
Information in this document is subject to change without notice.
© 2011 Dell Inc. All rights reserved.
Trademarks used in this text: Dell™, the DELL logo, and Inspiron™ are trademarks of Dell Inc.;
Microsoft®, Windows®, and the Windows start button logo are either trademarks or registered
trademarks of Microsoft Corporation in the United States and/or other countries.
Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc.
is strictly forbidden.
Regulatory model: P20G Regulatory type: P20G001
2011-02 Rev. A00

Contents 3
Contents
1 Before You Begin. . . . . . . . . . . . . . . . . . . . 9
Recommended Tools. . . . . . . . . . . . . . . . . . . . 9
Turning Off Your Computer. . . . . . . . . . . . . . . . . 9
Before Working Inside Your Computer . . . . . . . . . 10
2 Top Cover. . . . . . . . . . . . . . . . . . . . . . . . . 13
Removing the Top Cover . . . . . . . . . . . . . . . . . 13
Replacing the Top Cover . . . . . . . . . . . . . . . . . 14
3Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Removing the Battery . . . . . . . . . . . . . . . . . . 15
Replacing the Battery . . . . . . . . . . . . . . . . . . 16
4 Module Cover . . . . . . . . . . . . . . . . . . . . . 17
Removing the Module Cover. . . . . . . . . . . . . . . 17
Replacing the Module Cover . . . . . . . . . . . . . . 18
5 Optical Drive . . . . . . . . . . . . . . . . . . . . . . 19
Removing the Optical Drive . . . . . . . . . . . . . . . 19

4Contents
Replacing the Optical Drive . . . . . . . . . . . . . . . 21
6 Memory Module(s). . . . . . . . . . . . . . . . . 23
Removing the Memory Module(s) . . . . . . . . . . . . 23
Replacing the Memory Module(s) . . . . . . . . . . . . 24
7 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . 27
Removing the Keyboard . . . . . . . . . . . . . . . . . 27
Replacing the Keyboard . . . . . . . . . . . . . . . . . 29
8 Palm-Rest Assembly . . . . . . . . . . . . . . . 31
Removing the Palm-Rest Assembly . . . . . . . . . . . 31
Replacing the Palm-Rest Assembly . . . . . . . . . . . 34
9 Hot-Key Board . . . . . . . . . . . . . . . . . . . . 37
Removing the Hot-Key Board . . . . . . . . . . . . . . 37
Replacing the Hot-Key Board . . . . . . . . . . . . . . 38
10 Power Button Board . . . . . . . . . . . . . . . 41
Removing the Power Button Board . . . . . . . . . . . 41
Replacing the Power Button Board . . . . . . . . . . . 42

Contents 5
11 Wireless Mini-Card(s) . . . . . . . . . . . . . . . 45
Removing the Mini-Card(s) . . . . . . . . . . . . . . . 45
Replacing the Mini-Card(s) . . . . . . . . . . . . . . . 47
12 Thermal Fan . . . . . . . . . . . . . . . . . . . . . . . 49
Removing the Thermal Fan . . . . . . . . . . . . . . . 49
Replacing the Thermal Fan . . . . . . . . . . . . . . . 50
13 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Display Assembly . . . . . . . . . . . . . . . . . . . . 53
Removing the Display Assembly . . . . . . . . . . 53
Replacing the Display Assembly . . . . . . . . . . 56
Display Bezel . . . . . . . . . . . . . . . . . . . . . . 57
Removing the Display Bezel . . . . . . . . . . . . 57
Replacing the Display Bezel . . . . . . . . . . . . 58
Display Panel . . . . . . . . . . . . . . . . . . . . . . 58
Removing the Display Panel . . . . . . . . . . . . 58
Replacing the Display Panel . . . . . . . . . . . . 59
Display Cable . . . . . . . . . . . . . . . . . . . . . . 60
Removing the Display Cable . . . . . . . . . . . . 60
Replacing the Display Cable . . . . . . . . . . . . 60
Hinge Caps . . . . . . . . . . . . . . . . . . . . . . . . 61
Removing the Hinge Caps . . . . . . . . . . . . . 61
Replacing the Hinge Caps . . . . . . . . . . . . . 62
Display Brackets. . . . . . . . . . . . . . . . . . . . . 62

6Contents
Removing the Display Brackets . . . . . . . . . . 62
Replacing the Display Brackets . . . . . . . . . . 63
14 Camera Module . . . . . . . . . . . . . . . . . . . 65
Removing the Camera Module. . . . . . . . . . . . . . 65
Replacing the Camera Module . . . . . . . . . . . . . 66
15 Hinge Cover . . . . . . . . . . . . . . . . . . . . . . 69
Removing the Hinge Cover. . . . . . . . . . . . . . . . 69
Replacing the Hinge Cover . . . . . . . . . . . . . . . 71
16 VGA Connector Board . . . . . . . . . . . . . . 73
Removing the VGA Connector Board . . . . . . . . . . 73
Replacing the VGA Connector Board . . . . . . . . . . 74
17 System Board . . . . . . . . . . . . . . . . . . . . . 77
Removing the System Board . . . . . . . . . . . . . . . 77
Replacing the System Board. . . . . . . . . . . . . . . 81
Entering the Service Tag in the BIOS . . . . . . . . . . 82
18 Speakers . . . . . . . . . . . . . . . . . . . . . . . . 83
Removing the Speakers . . . . . . . . . . . . . . . . . 83
Replacing the Speakers . . . . . . . . . . . . . . . . . 84

Contents 7
19 Coin-Cell Battery . . . . . . . . . . . . . . . . . . . 87
Removing the Coin-Cell Battery . . . . . . . . . . . . . 87
Replacing the Coin-Cell Battery. . . . . . . . . . . . . 88
20 Thermal Cooling Assembly . . . . . . . . . . . 89
Removing the Thermal Cooling Assembly . . . . . . . 89
Replacing the Thermal Cooling Assembly . . . . . . . 90
21 Processor Module . . . . . . . . . . . . . . . . . . 91
Removing the Processor Module . . . . . . . . . . . . 91
Replacing the Processor Module . . . . . . . . . . . . 92
22 Hard-Drive Assembly . . . . . . . . . . . . . . . 95
Removing the Hard-Drive Assembly. . . . . . . . . . . 95
Replacing the Hard-Drive Assembly . . . . . . . . . . 97
23 I/O Board . . . . . . . . . . . . . . . . . . . . . . . . . 99
Removing the I/O Board . . . . . . . . . . . . . . . . . 99
Replacing the I/O Board . . . . . . . . . . . . . . . . . 100
24 AC-Adapter Connector . . . . . . . . . . . . . 101
Removing the AC-Adapter Connector . . . . . . . . . . 101

8Contents
Replacing the AC-Adapter Connector . . . . . . . . . 102
25 Flashing the BIOS . . . . . . . . . . . . . . . . . 105

Before You Begin 9
1
Before You Begin
This manual provides procedures for removing and installing components in
your computer. Unless otherwise noted, each procedure assumes that the
following conditions exist:
• You have performed the steps in "Turning Off Your Computer" on page 9
and "Before Working Inside Your Computer" on page 10.
• You have read the safety information that shipped with your computer
.
• A component can be replaced or—if purchased separately—installed by
performing the removal procedure in the reverse order.
Recommended Tools
The procedures in this document may require the following tools:
• Small flat-blade screwdriver
•Phillipsscrewdriver
•Plasticscribe
• BIOS executable update program available at
support.dell.com
Turning Off Your Computer
CAUTION: To avoid losing data, save and close all open files and exit all open
programs before you turn off your computer.
1 Save and close all open files and exit all open programs.
2 Click the Start button and then click Shut Down .
The computer turns off after the operating system shutdown process
finishes.
3 Ensure that the computer is turned off. If your computer did not
automatically turn off when you shut down the operating system, press
and hold the power button until the computer turns off.

10 Before You Begin
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from
potential damage and to help to ensure your own personal safety.
WARNING: Before working inside your computer, read the safety information
that shipped with your computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at dell.com/regulatory_compliance.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist
grounding strap or by periodically touching an unpainted metal surface (such as a
connector on your computer).
CAUTION: Handle components and cards with care. Do not touch the components
or contacts on a card. Hold a card by its edges or by its metal mounting bracket.
Hold a component such as a processor by its edges, not by its pins.
CAUTION: Only a certified service technician should perform repairs on your
computer. Damage due to servicing that is not authorized by Dell is not covered by
your warranty.
CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab,
not on the cable itself. Some cables have connectors with locking tabs; if you are
disconnecting this type of cable, press in on the locking tabs before you
disconnect the cable. As you pull connectors apart, keep them evenly aligned to
avoid bending any connector pins. Also, before you connect a cable, ensure that
both connectors are correctly oriented and aligned.
CAUTION: To avoid damaging the computer, perform the following steps before
you begin working inside the computer.
1 Ensure that the work surface is flat and clean to prevent the computer
cover from being scratched.
2 Turn off your computer (see "Turning Off Your Computer" on page 9) and
all attached devices.
CAUTION: To disconnect a network cable, first unplug the cable from your
computer and then unplug the cable from the network device.
3 Disconnect all telephone or network cables from the computer.
4 Press and eject any installed cards from the 8-in-1 media card reader.
5 Disconnect your computer and all attached devices from their electrical
outlets.
6 Disconnect all attached devices from your computer.

Before You Begin 11
CAUTION: To help prevent damage to the system board, remove the main battery
(see "Removing the Battery" on page 15) before working inside the computer.
7 Remove the battery (see "Removing the Battery" on page 15).
8 Turn the computer top-side up, open the display, and press the power
button to ground the system board.

12 Before You Begin

Top Cover 13
2
Top Cover
WARNING: Before working inside your computer, read the safety information
that shipped with your computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at dell.com/regulatory_compliance.
CAUTION: Only a certified service technician should perform repairs on your
computer. Damage due to servicing that is not authorized by Dell is not covered by
your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist
grounding strap or by periodically touching an unpainted metal surface (such as a
connector on your computer).
CAUTION: To help prevent damage to the system board, remove the main battery
(see "Removing the Battery" on page 15) before working inside the computer.
Removing the Top Cover
1 Follow the instructions in "Before You Begin" on page 9.
2 Press and hold the release button that secures the top cover to the display
back cover.
3 Slide and lift the top cover.

14 Top Cover
Replacing the Top Cover
1 Follow the instructions in "Before You Begin" on page 9.
NOTE: Ensure that the Dell logo is facing towards the back of the computer while
replacing the top cover.
2 Align the top cover to the display back cover.
3 Slide the top cover until it clicks into place. Ensure that there are no gaps
between the top cover and display back cover.
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.
1 top cover 2 release button
1
2

Battery 15
3
Battery
WARNING: Before working inside your computer, read the safety information
that shipped with your computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at dell.com/regulatory_compliance.
CAUTION: Only a certified service technician should perform repairs on your
computer. Damage due to servicing that is not authorized by Dell is not covered by
your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist
grounding strap or by periodically touching an unpainted metal surface (such as a
connector on your computer).
CAUTION: To avoid damage to the computer, use only the battery designed for
this particular Dell computer. Do not use batteries designed for other Dell
computers.
Removing the Battery
1 Follow the instructions in "Before You Begin" on page 9.
2 Shut down the computer and turn it over.
3 Slide the battery lock latch until it clicks into place.
4 Slide the battery release latch to the unlock position.
5 Slide and lift the battery out of the battery bay.

16 Battery
Replacing the Battery
1 Follow the instructions in "Before You Begin" on page 9.
2 Slide the battery into the battery bay until it clicks into place.
3 Slide the battery lock latch to the lock position.
1 battery release latch 2 battery
3 battery lock latch
1
2
3

Module Cover 17
4
Module Cover
WARNING: Before working inside your computer, read the safety information
that shipped with your computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at dell.com/regulatory_compliance.
CAUTION: Only a certified service technician should perform repairs on your
computer. Damage due to servicing that is not authorized by Dell is not covered by
your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist
grounding strap or by periodically touching an unpainted metal surface (such as a
connector on your computer).
CAUTION: To help prevent damage to the system board, remove the main battery
(see "Removing the Battery" on page 15) before working inside the computer.
Removing the Module Cover
1 Follow the instructions in "Before You Begin" on page 9.
2 Remove the battery (see "Removing the Battery" on page 15).
3 Loosen the captive screw that secures the module cover to the computer
base.
4 Using your fingertips, release the tabs on the module cover from the slots on
the computer base.
5 Lift the module cover off the computer base.

18 Module Cover
Replacing the Module Cover
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the tabs on the module cover with the slots on the computer base
and gently snap the cover in place.
3 Tighten the captive screw that secures the module cover to the computer
base.
4 Replace the battery (see "Replacing the Battery" on page 16).
CAUTION: Before turning on the computer, replace all screws and ensure that no
stray screws remain inside the computer. Failure to do so may result in damage to
the computer.
1 captive screw 2 module cover
3 tabs (2)
2
3
1

Optical Drive 19
5
Optical Drive
WARNING: Before working inside your computer, read the safety information
that shipped with your computer. For additional safety best practices information,
see the Regulatory Compliance Homepage at dell.com/regulatory_compliance.
CAUTION: Only a certified service technician should perform repairs on your
computer. Damage due to servicing that is not authorized by Dell is not covered by
your warranty.
CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist
grounding strap or by periodically touching an unpainted metal surface (such as a
connector on your computer).
CAUTION: To help prevent damage to the system board, remove the main battery
(see "Removing the Battery" on page 15) before working inside the computer.
Removing the Optical Drive
1 Follow the instructions in "Before You Begin" on page 9.
2 Remove the battery (see "Removing the Battery" on page 15).
3 Remove the module cover (see "Removing the Module Cover" on
page 17).
4 Remove the screw that secures the optical-drive assembly to the computer
base.
5 Slide the optical-drive assembly out of the optical-drive compartment.

20 Optical Drive
6 Remove the two screws that secure the optical-drive bracket to the optical
drive.
7 Pull the optical-drive bezel to detach it from the optical drive.
1 optical-drive assembly 2 screw
2
1