Dell Inspiron 14 3420 User manual

Dell Inspiron M4040/14-N4050/
3520 Owner’s Manual
Regulatory model: P22G Regulatory type: P22G001; P22G002

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.
____________________
© 2011-2012 Dell Inc. All rights reserved.
Trademarks used in this text: Dell™, the DELL logo, and Inspiron™are trademarks of Dell Inc.;
Bluetooth®is a registered trademark owned by Bluetooth SIG, Inc.; Microsoft®, Windows®, and the
Windowsstartbuttonlogo areeithertrademarksorregisteredtrademarksofMicrosoftCorporation
in the United States and/or other countries.
Regulatory model: P22G Regulatory type: P22G001; P22G002
2012 - 10 Rev. A01

Contents 3
Contents
1 Before You Begin. . . . . . . . . . . . . . . . . . . . 9
Recommended Tools. . . . . . . . . . . . . . . . . . . . 9
Turning Off Your Computer. . . . . . . . . . . . . . . . 10
Before Working Inside Your Computer . . . . . . . . . 10
2Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Removing the Battery . . . . . . . . . . . . . . . . . . 13
Replacing the Battery . . . . . . . . . . . . . . . . . . 14
3 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . 15
Removing the Keyboard . . . . . . . . . . . . . . . . . 15
Replacing the Keyboard . . . . . . . . . . . . . . . . . 17
4 Memory Module(s) . . . . . . . . . . . . . . . . . 19
Removing the Memory Module(s) . . . . . . . . . . . . 19
Replacing the Memory Module(s). . . . . . . . . . . . 20

4Contents
5 Optical Drive . . . . . . . . . . . . . . . . . . . . . 23
Removing the Optical Drive . . . . . . . . . . . . . . . 23
Replacing the Optical Drive . . . . . . . . . . . . . . . 24
6 Palm-Rest Assembly . . . . . . . . . . . . . . . 25
Removing the Palm-Rest Assembly . . . . . . . . . . . 25
Replacing the Palm-Rest Assembly . . . . . . . . . . . 28
7 Power Button Board . . . . . . . . . . . . . . . 31
Removing the Power Button Board . . . . . . . . . . . 31
Replacing the Power Button Board . . . . . . . . . . . 32
8HardDrive. . . . . . . . . . . . . . . . . . . . . . . 33
Removing the Hard Drive . . . . . . . . . . . . . . . . 33
Replacing the Hard Drive . . . . . . . . . . . . . . . . 35
9 Wireless Mini-Card . . . . . . . . . . . . . . . . 37
Removing the Mini-Card . . . . . . . . . . . . . . . . . 37
Replacing the Mini-Card. . . . . . . . . . . . . . . . . 38

Contents 5
10 Audio Board. . . . . . . . . . . . . . . . . . . . . . . 41
Removing the Audio Board . . . . . . . . . . . . . . . 41
Replacing the Audio Board . . . . . . . . . . . . . . . 42
11 Coin-Cell Battery . . . . . . . . . . . . . . . . . . . 43
Removing the Coin-Cell Battery . . . . . . . . . . . . . 43
Replacing the Coin-Cell Battery. . . . . . . . . . . . . 45
12 USB Board . . . . . . . . . . . . . . . . . . . . . . . . 47
Removing the USB Board . . . . . . . . . . . . . . . . 47
Replacing the USB Board . . . . . . . . . . . . . . . . 48
13 Thermal Cooling Assembly . . . . . . . . . . . 49
Removing the Thermal Cooling Assembly . . . . . . . 49
Replacing the Thermal Cooling Assembly . . . . . . . 50
14 Processor Module
(For Inspiron 14-N4050 Only) . . . . . . . . . 51
Removing the Processor Module . . . . . . . . . . . . 51
Replacing the Processor Module . . . . . . . . . . . . 52

6Contents
15 Hinge Cover . . . . . . . . . . . . . . . . . . . . . . 55
Removing the Hinge Cover. . . . . . . . . . . . . . . . 55
Replacing the Hinge Cover . . . . . . . . . . . . . . . 57
16 Display . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Display Assembly . . . . . . . . . . . . . . . . . . . . 59
Removing the Display Assembly . . . . . . . . . . 59
Replacing the Display Assembly . . . . . . . . . . 61
Display Bezel. . . . . . . . . . . . . . . . . . . . . . . 62
Removing the Display Bezel . . . . . . . . . . . . 62
Replacing the Display Bezel . . . . . . . . . . . . 63
Removing the Display Panel . . . . . . . . . . . . 63
Replacing the Display Panel . . . . . . . . . . . . 66
17 Camera Module . . . . . . . . . . . . . . . . . . . 69
Removing the Camera Module. . . . . . . . . . . . . . 69
Replacing the Camera Module . . . . . . . . . . . . . 70
18 System Board . . . . . . . . . . . . . . . . . . . . . 73
Removing the System Board . . . . . . . . . . . . . . . 73
Replacing the System Board . . . . . . . . . . . . . . . 75
Entering the Service Tag in the BIOS . . . . . . . . . . 76
19 Flashing the BIOS . . . . . . . . . . . . . . . . . 77

Contents 7

8Contents

Before You Begin 9
1
Before You Begin
This manual provides procedures for removing and installing components in
your computer. Before you begin any procedure in this book, ensure that:
• You have performed the steps in "Turning Off Your Computer" on page 10
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

10 Before You Begin
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 Shut down your computer.
•Windows8
Move your mouse pointer to the upper-right or lower-right corner of
the screen to open the Charms sidebar, and then click
Settings →
Power → Shut down .
•Windows7
Click Start and then click Shut Down .
The computer turns off after the operating system shutdown process is
completed.
NOTE: If you are using a different operating system, see the documentation of
your operating system for shut-down instructions.
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.
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from
potential damage and 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
www.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.

Before You Begin 11
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 10, 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 3-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.
CAUTION: To help prevent damage to the system board, remove the main battery,
see "Removing the Battery" on page 13, before working inside the computer.
7 Remove the battery. See "Removing the Battery" on page 13.
8 Turn the computer top-side up, open the display, and press the power
button to ground the system board.

12 Before You Begin

Battery 13
2
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
www.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 Turn off the computer and turn it over.
3 Slide the battery lock latch to the unlock position until it clicks into place.
4 Slide and hold the battery release latch in the unlock position.
5 Slide and lift the battery out of the battery bay.

14 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

Keyboard 15
3
Keyboard
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
www.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 13, before working inside the computer.
Removing the Keyboard
1 Follow the instructions in "Before You Begin" on page 9.
2 Remove the battery. See "Removing the Battery" on page 13.
CAUTION: The keycaps on the keyboard are fragile, easily dislodged, and
time-consuming to replace. Be careful when removing and handling the keyboard.
3 Turn the computer over and open the display as far as possible.
4 Using a plastic scribe, release the four tabs that secure the keyboard to the
palm rest and ease the keyboard up until it clears off the palm rest.

16 Keyboard
CAUTION: Be extremely careful when removing and handling the keyboard.
Failure to do so could result in scratching the display panel.
5 Without pulling hard on the keyboard, hold it towards the display.
6 Lift the connector latch that secures the keyboard cable to the connector
on the system board and remove the keyboard cable.
7 Lift the keyboard off the computer.
1 plastic scribe 2 tabs (4)
3 keyboard
2
1
3

Keyboard 17
Replacing the Keyboard
1 Follow the instructions in "Before You Begin" on page 9.
2 Slide the keyboard cable into the connector on the system board. Press
down on the connector latch to secure the keyboard cable to the connector
on the system board.
3 Slide the tabs on the keyboard into the slots on the palm rest.
4 Gently press around the edges of the keyboard to lock the four tabs
securing the keyboard.
5 Close the display and turn the computer over.
6 Replace the battery. See "Replacing the Battery" on page 14.
1 keyboard cable 2 keyboard
1
2

18 Keyboard

Memory 19
4
Memory Module(s)
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
www.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 13, before working inside the computer.
You can increase your computer memory by installing memory modules on
the system board. For information on the type of memory supported by your
computer, see the Specifications at support.dell.com/manuals.
NOTE: Memory modules purchased from Dell are covered under your
computer warranty.
Your computer has two user-accessible SODIMM sockets, labeled DIMM A
and DIMM B, that can be accessed from the bottom of the computer.
Removing the Memory Module(s)
1 Follow the instructions in "Before You Begin" on page 9.
2 Remove the battery. See "Removing the Battery" on page 13.
3 Remove the keyboard. See "Removing the Keyboard" on page 15.
CAUTION: To prevent damage to the memory module connector, do not use tools
to spread the memory module securing clips.
4 Use your fingertips to carefully spread apart the securing clips on each end
of the memory-module connector until the module pops up.
5 Remove the memory module from the memory-module connector.

20 Memory
Replacing the Memory Module(s)
CAUTION: If you need to install memory modules in two connectors, install a
memory module in the connector labeled “DIMM A” before you install a memory
module in the connector labeled “DIMM B.”
1 Follow the instructions in "Before You Begin" on page 9.
2 Align the notch in the memory module with the tab in the
memory-module connector.
3 Slide the memory module firmly into the slot at a 45-degree angle, and
press the memory module down until it clicks into place. If you do not hear
the click, remove the memory module and reinstall it.
NOTE: If the memory module is not installed properly, the computer may not boot.
1 memory-module connector 2 securing clips (2)
3 memory module
1
2
3