HP Compaq NX4820 Manual

Maintenance and Service
Guide
HP Pavilion dv1400 Entertainment
Notebook PC
HP Compaq nx4820 Notebook PC
Compaq Presario V2400 Notebook PC
Document Part Number: 396166-002
November 2005
This guide is a troubleshooting reference used for maintaining
and servicing the computer. It provides comprehensive
information on identifying computer features, components, and
spare parts; troubleshooting computer problems; and performing
computer disassembly procedures.

© Copyright 2005 Hewlett-Packard Development Company, L.P.
Microsoft and Windows are U.S. registered trademarks of Microsoft
Corporation. Intel, Pentium, and Celeron are trademarks or registered
trademarks of Intel Corporation or its subsidiaries in the United States and
other countries. Bluetooth is a trademark owned by its proprietor and used
by Hewlett-Packard Company under license.
The information contained herein is subject to change without notice. The
only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing
herein should be construed as constituting an additional warranty. HP shall
not be liable for technical or editorial errors or omissions contained herein.
Maintenance and Service Guide
HP Pavilion dv1400 Entertainment Notebook PC
HP Compaq nx4820 Notebook PC
Compaq Presario V2400 Notebook PC
Second Edition November 2005
First Edition June 2005
Document Part Number: 396166-002

Maintenance and Service Guide iii
Contents
1 Product Description
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
1.2 Resetting the Computer. . . . . . . . . . . . . . . . . . . . . . . 1–4
1.3 Power Management. . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
1.4 External Components . . . . . . . . . . . . . . . . . . . . . . . . 1–6
1.5 Design Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . 1–36
2 Troubleshooting
2.1 Computer Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Accessing Computer Setup . . . . . . . . . . . . . . . . . . . . 2–2
Computer Setup Defaults . . . . . . . . . . . . . . . . . . . . . 2–2
Selecting from the File Menu . . . . . . . . . . . . . . . . . . 2–3
Selecting from the Security Menu . . . . . . . . . . . . . . 2–4
Selecting from the Tools Menu. . . . . . . . . . . . . . . . . 2–5
Selecting from the Advanced Menu . . . . . . . . . . . . . 2–6
2.2 Troubleshooting Flowcharts . . . . . . . . . . . . . . . . . . . 2–7

iv Maintenance and Service Guide
Contents
3 Illustrated Parts Catalog
3.1 Serial Number Location . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 Computer Major Components. . . . . . . . . . . . . . . . . . 3–2
3.3 Miscellaneous Plastics Kit . . . . . . . . . . . . . . . . . . . 3–20
3.4 Mass Storage Devices . . . . . . . . . . . . . . . . . . . . . . . 3–22
3.5 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–25
3.6 Sequential Part Number Listing . . . . . . . . . . . . . . . 3–27
4 Removal and Replacement Preliminaries
4.1 Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2 Service Considerations . . . . . . . . . . . . . . . . . . . . . . . 4–2
Plastic Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Cables and Connectors . . . . . . . . . . . . . . . . . . . . . . . 4–2
4.3 Preventing Damage to Removable Drives . . . . . . . . 4–3
4.4 Preventing Electrostatic Damage . . . . . . . . . . . . . . . 4–4
4.5 Packaging and Transporting Precautions . . . . . . . . . 4–5
4.6 Workstation Precautions . . . . . . . . . . . . . . . . . . . . . . 4–6
4.7 Grounding Equipment and Methods . . . . . . . . . . . . . 4–6

Contents
Maintenance and Service Guide v
5 Removal and Replacement Procedures
5.1 Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.2 Disassembly Sequence Chart . . . . . . . . . . . . . . . . . . 5–3
5.3 Preparing the Computer for Disassembly . . . . . . . . . 5–5
5.4 Hard Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–7
5.5 Computer Feet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–11
5.6 Memory Module . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–12
5.7 Mini PCI Communications Module . . . . . . . . . . . . 5–15
5.8 Optical Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–18
5.9 Switch Cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–20
5.10 Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–26
5.11 Display Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 5–32
5.12 Base Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–37
5.13 USB/S-Video Controller Board . . . . . . . . . . . . . . 5–44
5.14 Bluetooth Module . . . . . . . . . . . . . . . . . . . . . . . . . 5–46
5.15 Speaker Assembly. . . . . . . . . . . . . . . . . . . . . . . . . 5–48
5.16 RTC Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–50
5.17 Menu Control Button Board . . . . . . . . . . . . . . . . . 5–52
5.18 Heat Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–55
5.19 Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–57
5.20 Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–59
5.21 System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–61
5.22 LED Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–68

vi Maintenance and Service Guide
Contents
6 Specifications
A Connector Pin Assignments
B Power Cord Set Requirements
C Screw Listing
D Display Component Recycling
Index

Maintenance and Service Guide 1–1
1
Product Description
The HP Pavilion dv1400 Entertainment Notebook PC 1and the
HP Compaq nx4820 Notebook PC and Compaq Presario V2400
Notebook PC (both represented by 2) offer advanced modularity,
Intel® Pentium® M and Celeron® M processors, and extensive
multimedia support.
HP Pavilion dv1400, HP Compaq nx4820, and
Compaq Presario V2400

1–2 Maintenance and Service Guide
Product Description
1.1 Features
■The following processors are available, varying by
computer model:
❏Intel Pentium M 770 (2.13-GHz) with 400-MHz FSB
❏Intel Pentium M 760 (2.0-GHz) with 400-MHz FSB
❏Intel Pentium M 750 (1.8-GHz) with 400-MHz FSB
❏Intel Pentium M 740 (1.7-GHz) with 400-MHz FSB
❏Intel Pentium M 735a (1.7-GHz) with 400-MHz FSB
❏Intel Pentium M 730 (1.6-GHz) with 400-MHz FSB
❏Intel Pentium M 725 (1.6-GHz) with 400-MHz FSB
❏Intel Celeron M 380 (1.6-GHz) with 400-MHz FSB
❏Intel Celeron M 370 (1.4-GHz) with 400-MHz FSB
❏Intel Celeron M 360 (1.4-GHz) with 400-MHz FSB
❏Intel Celeron M 350 (1.3-GHz) with 400-MHz FSB
■14.0-inch WXGA (1280 × 768) TFT display with over
16.7 million colors, varying by computer model
■80-, 60-, or 40-GB high-capacity hard drive, varying by
computer model
■256-MB DDR synchronous DRAM (SDRAM) at 266 MHz,
expandable to 2.0 GB on models with Intel Mobile Pentium
M processors and 1.0 GB on models with Intel Celeron M
processors
■Microsoft® Windows® XP Home Edition or Windows XP
Professional, or Free DOS, varying by computer model
■Full-size Windows keyboard with embedded numeric keypad
■TouchPad pointing device with on button and dedicated
two-way scroll region
■Integrated 10/100 BASE-T Ethernet local area network
(LAN) network interface card (NIC) with RJ-45 jack
■Integrated high-speed 56K modem with RJ-11 jack

Product Description
Maintenance and Service Guide 1–3
■Integrated wireless support for Mini PCI IEEE 802.11b and
802.11b/g WLAN device
■Support for one Type II PC Card slots, with support for both
32-bit (CardBus) and 16-bit PC Cards
■External 65-watt AC adapter with 3-wire power cord
■6-cell or 12-cell Li-Ion battery pack
■Stereo speakers with volume up and down buttons
■Support for the following optical drives:
❏DVD+RW/R and CD-RW Double Layer Combo Drive
with LightScribe
❏DVD+RW/R and CD-RW Double Layer Combo Drive
❏DVD/CD-RW Combo Drive
❏DVD-ROM Drive
■Connectors:
❏External monitor
❏Universal Serial Bus (USB) v. 2.0
❏RJ-11 (modem)
❏RJ-45 (network)
❏Audio-out (headphone)
❏Audio-in (microphone)
❏Power
❏IEEE 1394 digital (select models only)
❏S-Video-out (select models only)
❏Infrared (HP Pavilion models only)
❏Parallel
❏Serial
❏Docking (select models only)
❏Digital memory card reader (select models only)

1–4 Maintenance and Service Guide
Product Description
1.2 Resetting the Computer
If the computer you are servicing has an unknown password,
follow these steps to clear the password. These steps also
clear CMOS:
1. Prepare the computer for disassembly (refer to Section 5.3,
“Preparing the Computer for Disassembly,” for more
information).
2. Remove the real time clock (RTC) battery (refer to
Section 5.16, “RTC Battery,” for more information).
3. Wait approximately 5 minutes.
4. Replace the RTC battery and reassemble the computer.
5. Connect AC power to the computer. Do not reinsert any
battery packs at this time.
6. Turn on the computer.
All passwords and all CMOS settings have been cleared.

Product Description
Maintenance and Service Guide 1–5
1.3 Power Management
The computer comes with power management features that
extend battery operating time and conserve power. The
computer supports the following power management features:
■Standby
■Hibernation
■Setting customization by the user
■Hotkeys for setting the level of performance
■Battery calibration
■Lid switch standby/resume
■Power button
■Advanced Configuration and Power Management (ACPM)
compliance

1–6 Maintenance and Service Guide
Product Description
1.4 External Components
The external components on the front of the HP Pavilion dv1400
are shown below and described in Table 1-1.
Front Components, HP Pavilion dv1400

Product Description
Maintenance and Service Guide 1–7
Table 1-1
Front Components
HP Pavilion dv1400
Item Component Function
1 Speakers (2) Produce stereo sound.
2Powerlight ■On: Computer is turned on.
■Blinking: Computer is in standby.
■Off: Computer is off.
3 IDE (Integrated Drive
Electronics) drive light
On or blinking: The internal hard drive or an
optical drive is being accessed.
4Batterylight ■Amber: The battery pack is charging.
■Green: The battery pack is fully charged.
■Off: The battery pack is discharging
or not inserted.
5 Display release latch Opens the computer.
6Audio-in
(microphone) jack
Connects an optional monaural
(single sound channel) microphone.
7Audio-out
(headphone) jack (2)
Connect optional headphones or powered
stereo speakers. Also connect the audio
function of an audio/video device such as
a television or VCR.

1–8 Maintenance and Service Guide
Product Description
The external components on the front of the HP Compaq nx4820
and Compaq Presario V2400 are shown below and described in
Table 1-2.
Front Components, HP Compaq nx4820 and
Compaq Presario V2400

Product Description
Maintenance and Service Guide 1–9
Table 1-2
Front Components
HP Compaq nx4820 and Compaq Presario V2400
Item Component Function
1 Speakers (2) Produce stereo sound.
2 Wireless button light
(select models only)
On: An integrated wireless device is
hardware enabled.
3Powerlight ■On: Computer is turned on.
■Blinking: Computer is in standby.
■Off: Computer is off.
4 IDE (Integrated Drive
Electronics) drive light
■On or blinking: The internal hard drive
or an optical drive is being accessed.
5Batterylight ■Amber: The battery pack is charging.
■Green: The battery pack is fully charged.
■Off: The battery pack is discharging
or not inserted.
6 Display release latch Opens the computer.
7Audio-in
(microphone) jack
Connects an optional monaural
(single sound channel) microphone.
8Audio-out
(headphone) jack
(2 on HP Pavilion
dv1400 models)
Connect optional headphones or powered
stereo speakers. Also connect the audio
function of an audio/video device such as
a television or VCR.

1–10 Maintenance and Service Guide
Product Description
The external components on the right side of the
HP Pavilion dv1400 are shown below and described in Table 1-3.
Right-Side Components, HP Pavilion dv1400

Product Description
Maintenance and Service Guide 1–11
Table 1-3
Right-Side Components
HP Pavilion dv1400
Item Component Function
1 USB connectors (2) Connect an optional USB device.
2 6-in-1 Digital Media
Reader (select models
only)
In Windows, supports digital memory cards.
3 1394 port
(select models only)
Connects an optional 1394a device such
as a scanner, digital camera, or digital
camcorder.
4 6-in-1 Digital Media
Reader light
(select models only)
On: A digital memory card is being
accessed.
5 Optical drive Supports an optical disc.
6S-Video-outjack
(select models only)
Connects an optional S-Video device, such
as a television, VCR, camcorder, projector,
or video capture card.

1–12 Maintenance and Service Guide
Product Description
The external components on the right side of the
HP Compaq nx4820 and Compaq Presario V2400 are shown
below and described in Table 1-4.
Right-Side Components, HP Compaq nx4820 and
Compaq Presario V2400

Product Description
Maintenance and Service Guide 1–13
Table 1-4
Right-Side Components
HP Compaq nx4820 and Compaq Presario V2400
Item Component Function
1 USB connectors (2) Connect an optional USB device.
2 Digital memory card
reader
(select models only)
In Windows, supports digital memory cards.
3 1394 port
(select models only)
Connects an optional 1394 device such
as a scanner, digital camera, or digital
camcorder.
4 Digital memory card
reader light
(select models only)
On: A digital memory card is being
accessed.
5 Optical drive Supports an optical disc.
6S-Video-outjack
(select models only)
Connects an optional S-Video device, such
as a television, VCR, camcorder, projector,
or video capture card.

1–14 Maintenance and Service Guide
Product Description
The external components on the rear and left side of the
HP Pavilion dv1400 are shown below and described in Table 1-5.
Rear and Left-Side Components, HP Pavilion dv1400