Dell Inspiron 3668 User manual

Inspiron 3668
Service Manual
Computer Model: Inspiron 3668
Regulatory Model: D19M
Regulatory Type: D19M003

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make
better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or
loss of data and tells you how to avoid the problem.
WARNING: A WARNING indicates a potential for property damage,
personal injury, or death.
Copyright ©2017 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other
trademarks are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be
trademarks of their respective owners.
2017 - 01
Rev. A00

Contents
Before working inside your computer............................ 9
Before you begin ...................................................................................... 9
After working inside your computer............................. 10
Safety instructions........................................................11
Recommended tools.....................................................13
Screw list..................................................................... 14
Inside view of your computer....................................... 15
System board components...........................................16
Removing the computer cover .................................... 18
Procedure................................................................................................18
Replacing the computer cover .....................................19
Procedure................................................................................................19
Removing the front bezel ............................................20
Prerequisites........................................................................................... 20
Procedure................................................................................................21
Replacing the front bezel.............................................23
Procedure............................................................................................... 23
Post-requisites........................................................................................23
3

Removing the memory modules...................................24
Prerequisites........................................................................................... 24
Procedure............................................................................................... 24
Replacing the memory modules................................... 27
Procedure............................................................................................... 27
Post-requisites........................................................................................28
Removing the graphics card........................................ 29
Prerequisites........................................................................................... 29
Procedure............................................................................................... 29
Replacing the graphics card.........................................33
Procedure............................................................................................... 33
Post-requisites........................................................................................33
Removing the 3.5-inch hard drive................................34
Prerequisites........................................................................................... 34
Procedure............................................................................................... 34
Replacing the 3.5-inch hard drive................................ 39
Procedure............................................................................................... 39
Post-requisites........................................................................................39
Removing the 2.5-inch hard drives.............................. 40
Prerequisites........................................................................................... 40
Procedure............................................................................................... 40
Replacing the 2.5-inch hard drives...............................44
Procedure............................................................................................... 44
Post-requisites........................................................................................44
4

Removing the optical drive.......................................... 45
Prerequisites........................................................................................... 45
Procedure............................................................................................... 45
Replacing the optical drive.......................................... 50
Procedure...............................................................................................50
Post-requisites........................................................................................50
Removing the coin-cell battery.................................... 51
Prerequisites............................................................................................51
Procedure................................................................................................51
Replacing the coin-cell battery.................................... 54
Procedure............................................................................................... 54
Post-requisites........................................................................................54
Removing the wireless card.........................................55
Prerequisites...........................................................................................55
Procedure...............................................................................................55
Replacing the wireless card......................................... 58
Procedure............................................................................................... 58
Post-requisites........................................................................................59
Removing the antenna modules...................................60
Prerequisites...........................................................................................60
Procedure............................................................................................... 60
Replacing the antenna modules................................... 63
Procedure............................................................................................... 63
Post-requisites........................................................................................63
5

Removing the power-button module............................64
Prerequisites........................................................................................... 64
Procedure............................................................................................... 64
Replacing the power-button module............................ 67
Procedure............................................................................................... 67
Post-requisites........................................................................................67
Removing the chassis fan............................................ 68
Prerequisites........................................................................................... 68
Procedure............................................................................................... 68
Replacing the chassis fan............................................. 71
Procedure................................................................................................ 71
Post-requisites.........................................................................................71
Removing the power-supply unit..................................72
Prerequisites........................................................................................... 72
Procedure............................................................................................... 72
Replacing the power-supply unit..................................76
Procedure............................................................................................... 76
Post-requisites........................................................................................76
Removing the processor fan........................................ 77
Prerequisites............................................................................................77
Procedure................................................................................................77
Replacing the processor fan........................................ 80
Procedure............................................................................................... 80
Post-requisites........................................................................................80
6

Removing the processor heat-sink............................... 81
Prerequisites............................................................................................81
Procedure................................................................................................81
Replacing the processor heat-sink...............................83
Procedure............................................................................................... 83
Post-requisites........................................................................................83
Removing the system board........................................ 84
Prerequisites........................................................................................... 84
Procedure............................................................................................... 84
Replacing the system board.........................................87
Procedure............................................................................................... 87
Post-requisites........................................................................................ 87
BIOS setup program.................................................... 88
BIOS overview........................................................................................ 88
Entering BIOS setup program................................................................. 88
Clearing Forgotten Passwords................................................................88
Prerequisites..................................................................................... 88
Procedure......................................................................................... 88
Post-requisites..................................................................................90
Clearing CMOS Settings..........................................................................91
Prerequisites......................................................................................91
Procedure..........................................................................................91
Post-requisites..................................................................................93
Flashing the BIOS........................................................ 94
7

Getting help and contacting Dell..................................95
Self-help resources.................................................................................95
Contacting Dell....................................................................................... 95
8

Before working inside your
computer
NOTE: The images in this document may differ from your computer
depending on the configuration you ordered.
Before you begin
1 Save and close all open files and exit all open applications.
2 Shut down your computer. Click Start → Power → Shut down.
NOTE: If you are using a different operating system, see the
documentation of your operating system for shut-down instructions.
3 Disconnect your computer and all attached devices from their electrical outlets.
4 Disconnect all attached network devices and peripherals, such as keyboard,
mouse, and monitor from your computer.
5 Remove any media card and optical disc from your computer, if applicable.
6 After the computer is unplugged, press and hold the power button for 5 seconds
to ground the system board.
9

After working inside your
computer
CAUTION: Leaving stray or loose screws inside your computer may severely
damage your computer.
1 Replace all screws and ensure that no stray screws remain inside your computer.
2 Connect any external devices, peripherals, or cables you removed before
working on your computer.
3 Replace any media cards, discs, or any other parts that you removed before
working on your computer.
4 Connect your computer and all attached devices to their electrical outlets.
5 Turn on your computer.
10

Safety instructions
Use the following safety guidelines to protect your computer from potential damage
and ensure your personal safety.
WARNING: Before working inside your computer, read the safety
information that shipped with your computer. For more safety best
practices, see the Regulatory Compliance home page at www.dell.com/
regulatory_compliance.
WARNING: Disconnect all power sources before opening the computer
cover or panels. After you finish working inside the computer, replace all
covers, panels, and screws before connecting to the electrical outlet.
CAUTION: To avoid damaging the computer, ensure that the work surface
is flat and clean.
CAUTION: To avoid damaging the components and cards, handle them by
their edges, and avoid touching pins and contacts.
CAUTION: You should only perform troubleshooting and repairs as
authorized or directed by the Dell technical assistance team. Damage due to
servicing that is not authorized by Dell is not covered by your warranty. See
the safety instructions that shipped with the product or at www.dell.com/
regulatory_compliance.
CAUTION: Before touching anything inside your computer, ground yourself
by touching an unpainted metal surface, such as the metal at the back of
the computer. While you work, periodically touch an unpainted metal
surface to dissipate static electricity, which could harm internal
components.
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
or thumb-screws that you must disengage before disconnecting the cable.
When disconnecting cables, keep them evenly aligned to avoid bending any
connector pins. When connecting cables, ensure that the ports and
connectors are correctly oriented and aligned.
CAUTION: Press and eject any installed card from the media-card reader.
11

12

Recommended tools
The procedures in this document may require the following tools:
• Phillips screwdriver
• Plastic scribe
13

Screw list
The following table provides the list of screws that are used for securing different
components to the computer.
Table 1. Screw list
Component Secured to Screw type Quantity
Computer cover Chassis #6-32xL6.35 2
Chassis fan Chassis #6-32xL6.35 4
3.5-inch hard drive Side-chassis #6-32xL6.35 1
3.5-inch hard drive Hard-drive bracket #6-32xL3.6 4
Optical drive Side-chassis #6-32xL3.6 1
Optical drive Optical-drive
bracket
M2xL2 3
Wireless card System board M2xL3.5 1
Processor fan Processor heat sink M6xL10 4
Power-supply unit Chassis #6-32xL6.35 3
System board Chassis #6-32xL6.35 8
14

Inside view of your computer
1 system board 2 graphics card (PCIe x 16)
3 processor fan and heat-sink
assembly 4 memory module
5 optical drive 6 3.5-inch hard-drive assembly
7 2.5-inch hard-drive assembly 8 side-chassis
9 wireless card 10 power-supply unit
15

System board components
1 power-button cable connector 2 optical drive power-cable
connector
3 SATA 1 connector 4 SATA 0 connector
5 SATA 2 connector 6 SATA 3 connector
7 wireless-card slot 8 hard drive power-cable connector
9 power-supply unit cable connector 10 coin-cell battery
16

11 CMOS jumper 12 password jumper
13 service-mode jumper 14 graphics-card slot
15 PCIe x1 16 PCIe x1
17 chassis fan cable connector 18 processor socket
19 processor-fan cable connector 20 power-supply unit cable connector
21 memory-module slots (2)
17

Removing the computer cover
WARNING: Before working inside your computer, read the safety
information that shipped with your computer and follow the steps in Before
working inside your computer. After working inside your computer, follow
the instructions in After working inside your computer. For more safety best
practices, see the Regulatory Compliance home page at www.dell.com/
regulatory_compliance.
Procedure
1 Remove the two screws (#6-32xL6.35) that secure the cover to the chassis.
2 Release the computer cover by sliding it towards the back of the computer, lift
the cover off the chassis.
18

Replacing the computer cover
WARNING: Before working inside your computer, read the safety
information that shipped with your computer and follow the steps in Before
working inside your computer. After working inside your computer, follow
the instructions in After working inside your computer. For more safety best
practices, see the Regulatory Compliance home page at www.dell.com/
regulatory_compliance.
Procedure
1 Align the tabs on the computer cover with the slots on the chassis and slide it
towards the front of the computer.
2 Replace the two screws (#6-32xL6.35) that secure the computer cover to the
chassis.
19

Removing the front bezel
WARNING: Before working inside your computer, read the safety
information that shipped with your computer and follow the steps in Before
working inside your computer. After working inside your computer, follow
the instructions in After working inside your computer. For more safety best
practices, see the Regulatory Compliance home page at www.dell.com/
regulatory_compliance.
Prerequisites
Remove the computer cover.
20