Compaq presario 1900, presario1 905, presario 1906, presario 1910, presario 1915 schematic

Compaq.com - Compaq Discovery 1900 Series Maintenance and Service Guide - Models: 1905, 1910, 1915, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/index.html (1 of 2)6/27/2004 5:04:32 AM

Welcome to the Maintenance & Service Guide (MSG). This online guide is designed to
serve the needs of those whose job it is to repair Compaq products. Many of the
components of the hardcopy MSG are contained in this online guide. The Notice,
contains the copyright and trademark information. The Preface shows symbol
conventions, Technician Notes and Serial Number locations on the unit.

Compaq.com - Compaq Discovery 1900 Series Maintenance and Service Guide - Models: 1905, 1910, 1915, and 1920

Port

This MSG will be periodically maintained and updated online as needed.

Replicator
Components

For content comments or questions, contact the

Power
Management

To report a technical problem, contact your Regional Support Center or IM Help
Center.

1.800.AT.COMPAQ

privacy and legal statement

Editor.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/index.html (2 of 2)6/27/2004 5:04:32 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Notice

The information in this guide is subject to change without notice.

COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL
ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.

This guide contains information protected by copyright. No part of this guide may be photocopied or
reproduced in any form without prior written consent from Compaq Computer Corporation.

Ó 1998 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.

Compaq, Presario Registered U. S. Patent and Trademark Office.

Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft Corporation.
Windows 98 is a trademark of Microsoft Corporation.

The software described in this guide is furnished under a license agreement or nondisclosure agreement.
The software may be used or copied only in accordance with the terms of the agreement.

Product names mentioned herein may be trademarks and/or registered trademarks of their respective
companies.

Maintenance and Service Guide

Compaq Presario 1900 Series Portable Computers

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/notice.html (1 of 2)6/27/2004 5:04:38 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

First Edition (Oct. 1998)
Compaq Computer Corporation

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/notice.html (2 of 2)6/27/2004 5:04:38 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1815, 1820, and 1825

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preface

This Maintenance and Service Guide is a troubleshooting guide that can be used for reference when servicing the
Compaq Presario 1900 Series Portable Computers.

Compaq Computer Corporation reserves the right to make changes to the Compaq Presario 1900 Series Portable
Computers without notice.

Symbols

The following words and symbols mark special messages throughout this guide.

WARNING: Text set off in this manner indicates that failure to follow directions in the warning could result in bodily
harm or loss of life.

CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or
loss of data.

IMPORTANT:

Text set off in this manner presents clarifying information or specific
instructions.

NOTE:

Text set off in this manner presents commentary, sidelights, or interesting points of
information.

Technician Notes

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/preface.html (1 of 2)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1815, 1820, and 1825

WARNING: Only authorized technicians trained by Compaq should repair this equipment. All troubleshooting and repair
procedures are detailed to allow only subassembly/module level repair. Because of the complexity of the individual boards
and subassemblies, the user should not attempt to make repairs at the component level or to make modifications to any
printed circuit board. Improper repairs can create a safety hazard. Any indications of component replacement or printed
circuit board modifications may void any warranty

Serial Number

When requesting information or ordering spare parts, the computer serial number should be provided to Compaq. The
serial number is located on the bottom of the computer.

Locating Additional Information

The following documentation is available to support this product:

Compaq Presario 1900 Series Portable Computer documentation set

Introducing Windows 98 Guide

Service Training Guides
Compaq Service Advisories and Bulletins

Compaq QuickFind
Compaq Service Quick Reference Guide

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/preface.html (2 of 2)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Compaq
Presario
1900 Series
Portable
Computers
are a new
generation
of
multimedia
portable
computers
with an
ultimate thin
and light­weight
design,
outstanding
audio and
video,
advanced
core
features,
and
attractive
styling.

The
Removable
Drive Wedge

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (1 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Connectors

Port
Replicator
Components

Power
Management

provides
multimedia
expansion
capability
with a DVD
or CD-ROM
Drive and a
Diskette
Drive or LS­120 Drive
integrated
into one
removable
component.

Compaq
Presario
1900 Series
Portable
Computers
also have an
optional
integrated
10/100BaseT
Ethernet
Port
Replicator
allowing the
user to
quickly and
easily attach
or detach
the
computer
from
peripheral
devices. It
contains a
full array of
ports, some
which are
accessible
while the
system is
docked to
the Port
Replicator.

This full-

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (2 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1.800.AT.COMPAQ

privacy and legal statement

function
Intel Celeron
and Pentium
II - based
portable
computer
provides full
desktop
functionality.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (3 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Preliminary Steps

Clearing the Power­On Password

Power-On Self Test
(POST)

Compaq Diagnostics

Diagnostic Error
Codes

Troubleshooting
Without Diagnostics

Solving Minor
Problems

Contacting Compaq
Support

This section covers troubleshooting information for the Compaq
Presario 1900 Series Portable Computers. The basic steps in
troubleshooting include:

1.

Follow the Preliminary Steps .

2.

Run the Power-On Self-Test
(POST).

3.

Follow the recommended
actions described in the
diagnostic tables, if you are
unable to run POST or if POST
displays an error message.

When following the recommended
actions in the Sections on POST and

Diagnostic Error Codes perform them

in the order listed. Rerun POST after
each recommended action until the
problem is solved and no error
message occurs. Once the problem is
solved, do not complete the remaining
recommended actions.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/trouble.html (1 of 2)6/27/2004 5:04:40 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

If the problem is
intermittent, check the

NOTE:

computer several times to
verify that the problem is
solved.

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/trouble.html (2 of 2)6/27/2004 5:04:40 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

This
section
provides
an
illustrated
parts
breakdown
and a
reference
for spare
parts for
the
Presario
1900
Series
Portable
Computer.

Miscellaneous
Parts

Documentation
and Software

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/illustra.html (1 of 2)6/27/2004 5:04:41 AM

The
computer
(1) serial
number
should be
provided to
Compaq
whenever
requesting
information
or ordering
spare
parts. The
serial
number is
located

on

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1.800.AT.COMPAQ

privacy and legal statement

bottom of
unit.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/illustra.html (2 of 2)6/27/2004 5:04:41 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal and Replacement Procedures

This section explains the removal and replacement procedures for the computer.

Serial Number

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack

Hard Drive

Keyboard

Memory
Module

Report the
computer
serial
number to
Compaq
when
requesting
information
or ordering
spare
parts. The
serial
number is
located

on
bottom of
unit.

Modem

Heatspreader

Processor

Display Panel
Assembly

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/removal.html (1 of 2)6/27/2004 5:04:42 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Upper CPU
Cover with
Palmrest and
TouchPad

Hard Drive/
Battery
Charger Board

Converter
Board

Low Voltage
Differential
Signal Board

Fan Assembly

System Board

Speaker
Assembly

Disassembling
the Wedge

DVD or CD
Drive

System to
Wedge
Interface
Board

Diskette Drive

Wedge to Port
Replicator
Interface
Board

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/removal.html (2 of 2)6/27/2004 5:04:42 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

| Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Specifications

This chapter covers the following specifications of Compaq Presario 1900 Series Portable
Computers:

Physical and Environmental

System Interrupts

System DMA

System I/O Addresses

System Memory Catalog

Display

Diskette Drive or LS-120 Drive

Hard Drive

CD ROM or DVD Drive

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/specific.html (1 of 2)6/27/2004 5:04:44 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/specific.html (2 of 2)6/27/2004 5:04:44 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Connector Pin Assignments

This appendix provides connector pin assignment tables for Compaq Presario 1900 Series Portable
Computers. For more information on connectors, refer to the section on Rear Connectors .

NOTE: The signals in all tables of this appendix are considered active high unless otherwise
indicated by an asterisk (*).

Parallel Connector

Pin Signal Pin Signal

1 Strobe* 10 Acknowledge*
2 Data Bit 0 11 Busy
3 Data Bit 1 12 Paper Out
4 Data Bit 2 13 Select
5 Data Bit 3 14 Auto Linefeed*
6 Data Bit 4 15 Error*
7 Data Bit 5 16 Initialize Printer*
8 Data Bit 6 17 Select In*
9 Data Bit 7 18-25 Signal Ground
* = Active low

Serial Connector

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (1 of 4)6/27/2004 5:04:45 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Connector Pin Signal

1

2

3

4

5

6

7

8

9

Carrier Detect

Receive Data

Transmit Data

Data Terminal Ready

Signal Ground

Data Set Ready

Ready to Send

Clear to Send

Ring Indicator

Keyboard/Mouse Connector

Connector Pin Signal

1

2

3

4

5

6

Data

Not defined

Ground

+5 VDC

Clock

Not defined

External VGA Monitor Connector

Connector Pin Signal

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (2 of 4)6/27/2004 5:04:45 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1

2

3

4

5

6

7

8

9

10

Red Analog

Green Analog

Blue Analog

Not connected

Ground

Ground Analog

Ground Analog

Ground Analog

Not connected

Ground

11

12

13

14

15

Monitor Detect

DDC2B Data

Horizontal Sync

Vertical Sync

DDC2B Clock

Universal Serial Bus Connector

Connector Pin Signal

1 Ground

2 D+

3 D-

4 Power

Modem Connector

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (3 of 4)6/27/2004 5:04:45 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Connector Pin Signal

1

2

3

4

5

6

Unused

Unused

Tip

Ring

Unused

Unused

This information was not available at time of publication.

Port Replicator Connector

Pin Signal Pin Signal Pin Signal Pin Signal

This information was not available at time of publication.

LAN Connector

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (4 of 4)6/27/2004 5:04:45 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Models and Features

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Compaq Discovery 1900 Series Portable Computer Models

Model
1905

Display 12. 1" TFT 12. 1" TFT
Processor Intel Celeron/266-MHz

w/128K Cache

Hard Drive 4.0-GB 4.0-GB

Model
1906

Intel Celeron/266-MHz
w/128K Cache

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Modem 56.0 Kbps PCI Data/Fax 56.0 Kbps PCI Data/Fax
CD Drive 24X CD-ROM 24X CD-ROM

Model
1910

Display 12.1" TFT or 13. 3" TFT 12. 1" TFT or 13.3" TFT
Processor Intel Celeron/300-MHz

w/128K Cache or
PII/300-MHz w/512
Cache

Hard Drive 6.4-GB or 4.8-GB 4.0-GB
Modem 56.0 Kbps PCI Data/Fax

or 56.0 Kbps PCI Data/
Fax I

Model
1915

Pentium II/266-MHz
w/512K or 256K Cache
or PII/300-MHz w/512
Cache

56.0 Kbps PCI Data/Fax
or

56.0 Kbps PCI Data/Fax
(International)

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage1.html (1 of 2)6/27/2004 5:04:46 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Connectors

Port
Replicator
Components

Power
Management

DVD or CD Drive 24X CD Drive or 4X DVD DVD or 24X CD Drive

Model
1919

Model
1920

Display 13. 3" TFT 13. 3" TFT
Processor Intel Celeron/300-MHz

w/128K Cache

Pentium II/300-MHz
w/256K Cache

Hard Drive 6.4-GB 4.0-GB or 6.4-GB
Modem K-56.0 Kbps PCI Data/

Fax

56.0 Kbps PCI Data/Fax
or

56.0 Kbps PCI Data/Fax
(International)

DVD Drive DVD Drive DVD Drive

Next Page

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage1.html (2 of 2)6/27/2004 5:04:46 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Controls and Lights

United States June 27, 2004

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

Port
Replicator
Components

Front of Unit

1. Display 9.
TouchPad

2.

Backlight
Switch
Button

3.Instant

Internet
Access
Button

4.Instant

Search
Button

5. Power

(On/Off)
Button

6. Instant

E­Commerce
(or
Favorite
Website)
Button

7. Instant

E-Mail
Button

10. Left
TouchPad
Button

11. Power
(On/Off)
Light

12. Scroll
(Up/
Down)
Button

13.
Battery
Charge
Light

14.
Display
Panel
Release
Button

15. Right
TouchPad
Button

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage2.html (1 of 2)6/27/2004 5:04:47 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

8.

Keyboard

16.
Integrated
Speakers

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage2.html (2 of 2)6/27/2004 5:04:47 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Status Panel Lights

Models and
Features

Controls and
Lights

Status Panel

Status

Panel
Lights

1. AC
Adapter
Light

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

2. Num
Lock
Light

3. Caps
Lock
Light

4. Scroll
Lock
Light

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage3.html (1 of 2)6/27/2004 5:04:48 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Connectors

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage3.html (2 of 2)6/27/2004 5:04:48 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Left Side Components

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side

Components

1. Security
Lock

2. Air Vent

3. PC Card
Slots

4. PC Card
Eject Levers

5. Hard Drive

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage4.html (1 of 2)6/27/2004 5:04:49 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage4.html (2 of 2)6/27/2004 5:04:49 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Right Side Components

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side

Components

1. Battery
Compartment

2. Volume Up/
Down Button

3. Headphone
Jack

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

4.
Microphone
Jack

5. Air Vent

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage5.html (1 of 2)6/27/2004 5:04:49 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage5.html (2 of 2)6/27/2004 5:04:49 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Bottom of Unit

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Bottom

of Unit

1. Wedge
Interface
Connector

2.
Keyboard
Eject
Switch

3. Battery
Release
Lever

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage6.html (1 of 2)6/27/2004 5:04:50 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage6.html (2 of 2)6/27/2004 5:04:50 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Left Side and Top Components of the Removable Drive Wedge

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Left Side
and Top

Components

of the

Removable

Drive Wedge

1. DVD
Drive or CD
ROM Drive

2. Wedge
Release
Button

3. System
to Wedge
Interface
Connector

4.
Alignment
Pins

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage8.html (1 of 2)6/27/2004 5:04:51 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage8.html (2 of 2)6/27/2004 5:04:51 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Right Side Components of the Removable Drive Wedge

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side

Components

Removable

Wedge

1. Wedge
Release
Button

2. Diskette
Drive or LS­120 Drive
Slot

3. Diskette
Drive or LS­120 Drive
Eject Button

of the

Drive

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage9.html (1 of 2)6/27/2004 5:04:52 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/npage9.html (2 of 2)6/27/2004 5:04:52 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Rear Connectors

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Rear

Connectors

1. Modem
Jack

2. USB Port

3. Keyboard/
Mouse Port

4. Serial
Port

5. Parallel
Port

6. External
Monitor Port

7. AC
Adapter

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage11.html (1 of 2)6/27/2004 5:04:52 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage11.html (2 of 2)6/27/2004 5:04:52 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Integrated 10/100BaseT Ethernet Port Replicator Connectors

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

Rear
Connectors

Port
Replicator
Connectors

Port
Replicator
Components

Power
Management

Integrated 10/100BaseT Ethernet

Port Replicator

Connectors

1. Keyboard/Mouse

2. AC Adapter

3. Serial Port

4. Parallel Port

5. External Monitor Port

6. Local Area Network (LAN)

7. Keyboard/Mouse

8. USB Port

9. MIDI/Game Pad/Joystick Port

10. Security Lock

1.800.AT.COMPAQ

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage12.html (1 of 2)6/27/2004 5:04:53 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage12.html (2 of 2)6/27/2004 5:04:53 AM

Port Interface

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Integrated 10/100BaseT Ethernet Port Replicator Components

Models and
Features

Controls and
Lights

Status Panel

Left Side
Components

Right Side
Components

Bottom of
Unit

Left Side
and Top
Wedge
Components

Right Side
Wedge
Components

CAUTION: The computer power switch should be

turned off before you connect or disconnect the port
replicator. Damage may occur to the computer if it is
"hot" plugged to the port replicator.

Integrated
10/100BaseT
Ethernet Port

Replicator

Components

1. Port
Replicator
Interface
Connector

2. Port
Replicator
Release Button

3. Keyboard/
Mouse
Connector

Rear
Connectors

Port
Replicator
Connectors

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage13.html (1 of 2)6/27/2004 5:04:54 AM

Port Interface

Port
Replicator
Components

Power
Management

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/npage13.html (2 of 2)6/27/2004 5:04:54 AM

HP E-mail support

Select your product

» Accessories
» Desktops & Workstations
» Digital Entertainment and Audio
» Digital Photography
» Fax/Copiers/Scanners
» Handheld Devices
» Home Networking
» Monitors and Projectors
» Networking
» Notebooks & Tablet PCs
» Options and Accessories
» Printing and Multifunction
» Servers
» Software
» Storage
» Supplies

HP E-mail support

Privacy statement Using this site means you accept its terms

© 2004 Hewlett-Packard Development Company, L.P.

http://h20180.www2.hp.com/apps/Nav?h_tool=email&h_lang=en&h_cc=us6/27/2004 5:05:05 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preliminary Steps

Before running POST, complete the following preliminary steps:

If a power-on password has been established, type the password and press the

1.

Enter key. If the password is not known, clear the password.

Run Compaq diagnostics.

2.

3.

Turn off the computer and its external devices.

4.

Disconnect any external devices that you do not want to test. Do not disconnect the
printer if you want to test it or use it to log error messages.

IMPORTANT:

Install loopback plugs in the serial and parallel connectors if you would like to test

5.

these ports.

If the problem only occurs when an external device is connected to the
computer, the problem may be related to the external device or its cable.
Verify this by running POST with and without the external device
connected.

6.

Ensure the hard drive is installed in the computer.

7.

Ensure that the battery pack is inserted in the computer and the computer is
connected to an external AC power source.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/prelim.html (1 of 2)6/27/2004 5:05:06 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

When the preliminary steps are completed, you are ready to run

1.800.AT.COMPAQ

privacy and legal statement

POST .

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/prelim.html (2 of 2)6/27/2004 5:05:06 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Clearing the Power-on Password

Clearing the power-on
password requires
removing all Setup
attributes that are
programmed in the CMOS.

If the password is not
known, clear it by
performing the following
steps:

1.

Turn off the
computer.

Disconnect the

2.

power cord.

3.

Remove the battery
pack .

Remove the

4.

keyboard.

Disconnect the

5.

backlight cable from

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/ponpass.html (1 of 2)6/27/2004 5:05:06 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

the connector on
the system board .

6.

Using a conductive
piece of material
(piece of wire or
tool) simultaneously
make contact with
the two pads
located at R37 on
the system board or
remove the RTC
battery located
under the battery

charger board for 5

seconds. The
password, together
with other Setup
attributes, will be
cleared.

1.800.AT.COMPAQ

privacy and legal statement

Reassemble the

7.

computer.

8.

Turn on the
computer to verify
that the power-on
password has been
cleared. If it has not
been cleared, repeat
Steps
1 through 7.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/ponpass.html (2 of 2)6/27/2004 5:05:06 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Power-On Self Test (POST)

Running POST

To run POST, complete the following steps:

United States June 27, 2004

Turn off the computer, then turn on the computer.

If POST does not detect any errors, the computer will not beep. This indicates successful completion of POST test.
POST has run successfully and boots from the hard drive (or from a bootable diskette if one is installed in the diskette
drive).

If POST detects errors, the errors are indicated by screen and/or audible messages. Refer to "Power-On Self-Test
(POST) Codes" in the tables for a list of POST codes and their relevant descriptions.

NOTE:

Probable Cause Recommended Action

DMA, timers, etc. Replace the system board.

Probable Cause Recommended Action

Configuration incorrect Run Computer Setup.
CMOS reflects that an invalid

configuration has been set.
RAM failure 1. Replace the memory modules.

If the system is not functioning well enough to run POST, or if the display is not functioning well enough to
show POST error messages, refer to the Troubleshooting tables.

Power-On Self-Test Messages

102-System Board Failure

162-System Options Not Set

Run Computer Setup.

2. Replace the system board.

Memory test data error 1. Replace the memory modules.

2. Replace the system board.

XX000YZZ RAM failure Replace the system board.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/power1.html (1 of 2)6/27/2004 5:05:07 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

XX000YZZ 201-Memory Error

Probable Cause Recommended Action

301-Keyboard Error

Probable Cause Recommended Action
Keyboard failure 1. Ensure the keys are not depressed during POST.

2. Reconnect the keyboard with the computer off.

3. Replace the keyboard.

304-Keyboard or System Unit Error

Probable Cause Recommended Action
Keyboard or system board error 1. Replace the keyboard.

2. Replace the TouchPad or mouse.

3. Replace the system board.

601-Diskette Controller Error

Probable Cause Recommended Action
Mismatch in drive type or failure in the diskette

1. Run Computer Checkup (TEST).

controller

2. Check and/or replace cables.

3. Replace the system board.

605-Diskette Drive Error

Probable Cause Recommended Action
Mismatch in drive type Run Computer Setup.

1780-Primary Hard Drive 0 Failure

Probable Cause Recommended Action
Disk 0 failed to respond 1. Run Computer Checkup (TEST).

2. Replace the hard drive.

Hard drive format error 1. Run Computer Checkup (TEST).

2. Replace the hard drive.

1782-Hard Drive Controller

Probable Cause Recommended Action
Hard drive controller failure 1. Run Computer Setup.

2. Replace the hard drive.

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/power1.html (2 of 2)6/27/2004 5:05:07 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Compaq Diagnostics

Compaq Diagnostics is installed on the hard drive of the computer. Run the Diagnostics
utilities when you want to view or test system information and if you have installed or
connected devices. If you run Compaq Diagnostics from a diskette, ensure that it is version

10.11 or later.

The Diagnostics menu includes the following utilities:

Computer Checkup (TEST)
View System Information (INSPECT)
Prepare Computer for a Compaq Service Call (RemotePaq)

If you have a difficult problem that seems unsolvable, run the Diagnostics utilities before
calling for support. Run Computer Checkup and select to save the device list to a file to print
or to save the log of errors. Run the View System Information (INSPECT) utility and select to
print or save that information. Have the files or the printed information available when you
call for support.

Computer Checkup (TEST)

Computer Checkup (TEST) determines whether the various computer components and
devices are recognized by the system and are functioning properly. You can display, print, or
save the information generated by Computer Checkup.

Follow these steps to run Computer Checkup:

1. Plug the computer into an external power source. (A low battery condition could

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/compaq.html (1 of 3)6/27/2004 5:05:08 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

interrupt the program.)

2. Turn on the external devices that you want to test. Connect the printer if you want to

print a log of error messages.

3. Insert the Compaq Diagnostics diskette in drive A.

4. Turn on or restart the computer. The computer starts from drive A, and the

Diagnostics Welcome screen appears.

5. Press Enter to continue. The Diagnostics menu appears.

6. Select Computer Checkup from the Diagnostics menu. A Test Option menu appears.

7. Select View the Device List from the Test Option menu. A list of the installed

Compaq devices appears.

8. If the list of installed devices is correct, select OK . The Test Option menu appears.

NOTE:

If the list is incorrect, ensure that any new devices are installed properly.

9. Select one of the following from the Test Option menu:

Quick Check Diagnostics. Runs a quick, general test on each device
with a minimal number of prompts. If errors occur, they are displayed
when the testing is complete. You cannot print or save the error
messages.

Automatic Diagnostics. Runs unattended, maximum testing of each
device with minimal prompts. You can choose the amount of times to run
the tests, stop on errors, or print/save a log of errors.

Prompted Diagnostics. Allows maximum control over testing the
devices. You can choose attended or unattended testing, decide to stop
on errors, or choose to print/save a log of errors.

10. Follow the instructions on the screen as the devices are tested. When testing is

complete, the Test Option menu appears.

11. Exit the Test Option menu.

12. Exit the Diagnostics menu.

View System Information (INSPECT)

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/compaq.html (2 of 3)6/27/2004 5:05:08 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

The View System Information (INSPECT) utility provides information about the computer and
installed or connected devices. You can display, print, or save the information.

Follow these steps to run View System Information (INSPECT) from the Compaq Diagnostics
diskette:

1. Turn on the external devices that you want to test. Connect the printer if you want to

print the information.

2. Insert the Compaq Diagnostics diskette in drive A.

3. Turn on or restart the computer. The computer starts from drive A, and the

Diagnostics Welcome screen appears.

4. Press Enter to continue. The Diagnostics menu appears.

5. Select View System Information (INSPECT) from the Diagnostics menu.

6. Select the item you want to view from the following list:

System Memory

ROM Audio

Keyboard Operating system

System ports System files

System storage Windows files

Graphics

7. Follow the instructions on the screen to cycle through the screens, to return to the list

and choose another item, or to print the information.

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/compaq.html (3 of 3)6/27/2004 5:05:08 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Diagnostic Error Codes

Diagnostic error codes occur if the system recognizes a problem while running the
Compaq Diagnostic program. These error codes help identify possibly defective
subassemblies.

The following tables list error codes, a description of the error condition, and the action
required to resolve the error condition.

IMPORTANT:

For the removal and replacement of a particular subassembly, see the section for

Removal and Replacement Procedures.

Select error codes by number or type:

101 through 114 Processor Test
200 through 215 Memory Test
300 through 304 Keyboard Test
401 through 403 Parallel Printer Test
600 through 699 Diskette Drive or LS-120 Test

Retest the system after completing each step. If the problem is resolved,
do not proceed with the remaining steps.

1101 Serial Test
1701 through 1736 Hard Drive Test
501 through 516 Video Test

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (1 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

2402 through 2456
2458 through 2480
3206 Audio Test
8601 through 8602 Touch Pad Pointing Device Test
3301 through 6623 CD/DVD Test

Processor Test Error Codes

Error

Code Description Recommended Action

101-xx CPU test failed Replace the processor and retest.
102-xx Coprocessor or Weitek Error 1. Run the Configuration and

Diagnostics Utilities.

2. Replace the processor board and

retest.
103-xx DMA page registers test failed Replace the system board and retest.
104-xx Interrupt controller master test

failed
105-xx Port 61 error
106-xx Keyboard controller self-test failed
107-xx CMOS RAM test failed
108-xx CMOS interrupt test failed
109-xx CMOS clock test failed
110-xx Programmable timer load data test

failed
113-xx Protected mode test failed
114-01 Speaker test failed 1. Check system configuration.

2. Verify cable connections to speaker.

3. Replace the system board and retest.

Memory Test Error Codes

200 -xx Memory machine ID test failed 1. Flash the system ROM and retest.
202-xx Memory system ROM checksum

2. Replace the system board and retest.

failed
203-xx Write/Read test failed 1. Remove the memory module and
204-xx Address test failed

retest.

2. Install a new memory module and

211-xx Random pattern test failed

retest.

214-xx Noise test failed
215-xx Random address test failed

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (2 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Keyboard Test Error Codes

300 -xx Failed ID Test 1. Check the keyboard connection. If

disconnected, turn off the computer

301-xx Failed Selftest/Interface Test

and connect the keyboard.

302-xx Failed Individual Key Test

2. Replace the keyboard and retest.

304-xx Failed Keyboard Repeat Test

3. Replace the system board and retest.

Parallel Printer Test Error Codes

401 -xx Printer failed or not connected 1. Connect the printer.

2. Check power to the printer.

402-xx Failed Port Test

3. Install the loop-back connector and
retest.

403-xx Printer pattern test failed

4. Check port and IRQ configuration.

5. Replace the system board and retest.

Diskette Drive Test

600 -xx

Diskette ID drive types test

failed
601-xx Diskette format failed

1. Replace the diskette media and
retest.

2. Check and/or replace the diskette
power and signal cables and retest.

602-xx Diskette read test failed

603-xx

Diskette write, read, compare test

failed

3. Replace the diskette drive and
retest.

4. Replace the system board and retest.

604-xx Diskette random read test failed
605-xx Diskette ID media failed
606-xx Diskette speed test failed
609-xx Diskette reset controller test failed
610-xx Diskette change line test failed
697-xx Diskette type error

698-xx

Diskette drive speed not within

limits

Diskette drive/media ID error 1. Replace media.
699-xx

2. Run the Configuration and
Diagnostics Utilities.

Serial Test Error Codes

1101-xx

Serial port test failed 1. Check port configuration

2. Replace the system board and retest.

Hard Drive Test Error Codes

1701-xx Hard drive format test failed 1. Run the Configuration and

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (3 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1702-xx Hard drive read test failed

1703-xx

Hard drive write/read/compare

test failed
1704-xx Hard drive random seek test failed
1705-xx Hard drive controller test failed
1706-xx Hard drive ready test failed
1707-xx Hard drive recalibration test failed

1708-xx

1709-xx

Hard drive format bad track test

failed

Hard drive reset controller test

failed
1710-xx Hard drive park head test failed
1715-xx Hard drive head select test failed

1716-xx

Hard drive conditional format test

failed

Diagnostics Utilities and verify drive
type.

2. Verify that all secondary drives have
secondary drive capability.

3. Replace the hard drive and retest.

4. Replace the system board and retest.

1717-xx Hard drive ECC* test failed
1719-xx Hard drive power mode test failed
1724-xx Network preparation test failed
1736-xx Drive monitoring test failed
* ECC = Error Correction Code

Video Test Error Codes

501-xx Video controller test failed The following apply to error codes 501­502-xx Video memory test failed
503-xx Video attribute test failed
504-xx Video character set test failed

505-xx

Video 80 × 25 mode 9 × 14

character cell test failed

xx through 516-xx:

1. Disconnect external monitor and test
with internal LCD display.

2. Replace the display assembly and
retest.

3. Replace the system board and retest.

506-xx

Video 80 × 25 mode 8 × 8

character cell test failed
507-xx Video 40 × 25 mode test failed

508-xx

509-xx

Video 320 × 200 mode color set 0

test failed

Video 320 × 200 mode color set 1

test failed
510-xx Video 640 × 200 mode test failed

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (4 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

511-xx

Video screen memory page test

failed
512-xx Video gray scale test failed
514-xx Video white screen test failed
516-xx Video noise pattern test failed
2402 -xx Video memory test failed The following steps apply to error codes
2403-xx Video attribute test failed
2404-xx Video character set test failed

2405-xx

2406-xx

2408-xx

2409-xx

Video 80 × 25 mode 9 × 14

character cell test failed

Video 80 × 25 mode 8 × 8

character cell test failed

Video 320 × 200 mode color set 0

test failed

Video 320 × 200 mode color set 1

test failed

2402-xx through 2456-xx:

1. Run the Configuration and
Diagnostics Utilities.

2. Replace the display assembly and
retest.

3. Replace the system board and retest.

2410-xx Video 640 × 200 mode test failed

2411-xx

Video screen memory page test

failed
2412-xx Video gray scale test failed
2414-xx Video white screen test failed

2416-xx Video noise pattern test failed

2418-xx ECG/VGC memory test failed

2419-xx ECG/VGC ROM checksum test

failed
2421-xx ECG/VGC 640 × 200 graphics

mode test failed
2422-xx ECG/VGC 640 × 350 16 color set

test failed

1. Run the Configuration and
Diagnostics Utilities.

2. Disconnect external monitor and test
with internal LCD display.

3. Replace the display assembly and
retest.

4. Replace the system board and retest.

2423-xx ECG/VGC 640 × 350 64 color set

test failed
2424-xx ECG/VGC monochrome text mode

test failed

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (5 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

2425-xx ECG/VGC monochrome graphics

mode test failed
2431-xx 640 × 480 graphics test failure

2432-xx 320 × 200 graphics (256 color

mode) test failure
2448-xx Advanced VGA Controller test

failed
2451-xx 132-column Advanced VGA test

failed
2456-xx Advanced VGA 256 Color

test failed
2458 -xx Advanced VGA BitBLT test The following step applies to error

codes 2458-xx through 2480-xx:

2468-xx Advanced VGA DAC test

Replace the system board and retest.

2477-xx Advanced VGA data path test

2478-xx Advanced VGA BitBLT test

2480-xx Advanced VGA LineDraw test

Audio Test Error Codes

3206 -xx Audio System Internal Error Replace the system board and retest.

TouchPad/Pointing Device Interface Test Error Codes

8601 -xx Mouse test failed 1. Replace the TouchPad and retest.

2. Replace the system board and retest.

8602-xx Interface test failed

CD/DVD Drive Test Error Codes

3301 -xx CD/DVD drive read test failed 1. Replace the CD/DVD and retest.

2. Verify that the speakers are

3305-xx CD/DVD drive seek test failed

connected.

3. Verify that drivers are loaded and
properly installed.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (6 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

6600-xx ID test failed

6605-xx Read test failed

6608-xx Controller test failed

6623-xx Random read test failed

Back to top

1.800.AT.COMPAQ

privacy and legal statement

4. Replace the CD/DVD drive and
retest.

5. Replace the system board and retest.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/error.html (7 of 7)6/27/2004 5:05:10 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting Without Diagnostics

This section provides information about how to identify and correct some common hardware, memory, and
software problems. It also explains several types of common messages that may be displayed on the screen. The
following pages contain troubleshooting information on:

Audio Memory
Battery/Battery gauge PC Card
CD/DVD drive Power
Diskette/Diskette drive Printer
Display Touch Pad
Hard drive Keyboard/Numeric keypad
Hardware Installation

Since symptoms can appear to be similar, carefully match the symptoms of the computer malfunction against the
problem description in the Troubleshooting tables to avoid a misdiagnosis.

WARNING: To avoid a potential shock hazard during troubleshooting procedures, disconnect all
power sources before removing the keyboard cover or the display bezel.

Before Replacing Parts

Verify that cables are connected properly to the suspected defective parts.

Run Computer Setup after connecting external devices.
Verify that all required device drivers are installed.
Verify that all required changes have been made to the CONFIG.SYS file.
Verify that all required changes have been made to the AUTOEXEC.BAT file.
Verify that all printer drivers have been installed for each application.

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20checked...1910%201915%201919%201920%201922%201925/tswo.html6/27/2004 5:05:11 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Solving Minor Problems

Some minor problems and possible solutions are outlined in the following tables. If the problem appears related to a
software application, check the documentation provided with the software.

Solving Audio Problems

Some common audio problems and solutions are listed in the following table.

Solving Audio Problems

Problem Probable Cause Solution(s)

Computer does not beep after the Power­On Self-Test (POST).

This is typical; it indicates successful
completion of the Power-On Self-Test
(POST).

No action is required.

Solving Battery Pack and Battery Gauge Problems

Some common causes and solutions for battery pack problems are listed in the following table. The "Solving Power
Problems" section in this chapter may also be applicable.

Solving Battery Pack and Battery Gauge Problems

Problem Probable Cause Solution(s)

Computer won't turn on when
battery pack is inserted and power
cord is unplugged.

Battery pack is discharged. Connect the computer to an external

power source and charge the battery
pack.

Replace the battery pack with a fully
charged battery pack.

Check the battery connectors on the
system board to verify they are
evenly spaced and that they are not
bent or broken.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (1 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Computer is beeping and battery LED
icon is blinking.

Computer battery LED icon (front on
the unit) blinks to indicate low
battery condition, but computer does
not beep.

Battery LED icon doesn't light and
battery pack won't fast charge.

You have to set the date and time
every time you turn on the
computer.

Battery charge is low. Immediately save any open file(s).

Then do any one of the following:

Connect the computer to an
external power source to
charge the battery pack.
Turn off the computer or
initiate Hibernation until you
can find another power source
or charge the battery pack.

Volume is turned down too low. Adjust the volume.

Battery pack is already charged. No action is necessary.
Battery pack was exposed to

temperature extremes.

Allow time for the battery pack to

return to room temperature.
Battery pack is at end of its life. Replace battery pack.
RTC battery is dead. Replace the RTC battery.

Battery charge does not last as
long as expected.

Battery pack is warm to the touch
after charging.

Battery pack operating time is far
less than the documented
average operating time.

Battery is being exposed to high
temperatures or extremely cold
temperatures.

Keep the battery pack within the
recommended operating temperature
range 50° F to 104° F (10° C to 40°
C) or recommended storage range

-4° F to 86° F (-20° C to 30° C ).
Recharge the battery pack.

Battery has partially self-discharged. Recharge the battery. Discharge the

battery completely and then
recharge it.

Power management is disabled. Set a power management level in

Computer Setup.

An external device or PC Card is
draining the battery.

Normal warming has occurred due to

Turn off or disconnect external
devices when not using them.

No action is required.

charging.

Power management is turned off or
disabled.

Enable power management in
Computer Setup and in Windows
Power Properties.

An external device or PC Card is
draining the battery.

Turn off or disconnect external
devices when not using them.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (2 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Battery pack has partially self­discharged.

Battery pack is being exposed to
high temperatures or extremely cold
temperatures.

Condition the battery pack by fully
charging, fully discharging, then fully
recharging it.

To maintain the charge, leave
battery packs in the computer when
it is connected to external power.

If the computer is disconnected from
external power for more than two
weeks, remove battery packs from
the computer to reduce the
discharge rate.

Keep the battery pack within the
recommended temperature ranges.
Operating: 50° F to 104° F
(10° C to 40° C)
Storage: -4° F to 86° F
(-20° C to 30° C )

Recharge the battery pack.

Solving CD/DVD Drive Problems

Some common causes and solutions for CD/DVD drive problems are listed in the following table.

Solving CD/DVD Drive Problems

Problem Probable Cause Solution(s)

CD/DVD drive cannot read a compact
disc or digital versatile disc.

Compact disc or digital versatile
disc is upside down or is
improperly inserted in the CD/DVD
drive.

CD is CD Plus or Pregap/Track 0
type.

Open the CD/DVD loading tray, lay

the compact disc or digital versatile

disc in it (label side up), then close

the tray.

Cannot read these type CDs in 24x.

Remove the CD.

Solving Diskette and Diskette Drive Problems

Some common causes and solutions for diskette and diskette drive problems are listed in the following table.

Solving Diskette and Diskette Drive Problems

Problem Probable Cause Solution(s)

Diskette drive cannot write to a
diskette.

Diskette is write-protected. Disable the diskette's write-protect

feature or use a diskette that is not
write-protected.

Computer is writing to the wrong
drive.

Not enough space is left on the
diskette.

Check the drive letter in the path
statement.

Use another diskette.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (3 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Drive error has occurred. Run Computer Checkup from the

Compaq Diagnostics diskette.

Diskette is not formatted. Format the diskette. At the system

prompt, enter

FORMAT A:

Diskette drive cannot read a diskette. The wrong type of diskette is being

used.

Use the type of diskette required by
the drive.

Diskette has a bad sector. Copy files to hard drive or another

diskette. Reformat bad floppy.

Drive error has occurred. Run Computer Checkup from the

Compaq Diagnostics diskette.

Diskette is not
formatted.

Format the diskette. At the system
prompt, enter

FORMAT A:

Cannot boot from diskette. Bootable diskette is not in drive A. Put the bootable diskette in drive A.

Diskette Boot has incorrect setting
in Computer Setup.

Run Computer Setup and set diskette
as first to boot.

Solving Display Problems

This section lists some common causes and solutions for computer display and external monitor problems.

You can perform a monitor self-test on an external VGA color or monochrome monitor by disconnecting the monitor
from the computer. To do so, complete the following steps:

1. Turn off the monitor.

2. Turn off the computer.

3. Disconnect the monitor signal cable from the computer.

4. Turn on the monitor and allow it to warm up for one minute.

The display should be white. A narrow black border may also appear on the left and right sides of the display. Either of
these displays indicates that the monitor is working properly.

Solving Display Problems

Problem Probable Cause Solution(s)

Screen is dim. Control for brightness (if applicable)

is not set properly.

Computer screen is in direct light. Tilt display or move computer.

Screen is blank. Screen save was initiated by Power

Management due to lack of user
activity.

Display has overheated. If computer is in direct sunlight,

Adjust the Brightness of the display
by using Fn + F7 (¯ ) or
Fn + F8 (- ).

Press any key or touch the Touch
Pad.

move it and allow it to cool off.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (4 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Display is blank and the Suspend icon
is flashing.

Internal display is blank and the
screen on an external monitor displays
information.

Internal display flashes or has garbled
characters when computer is
connected to external monitor.

The light tubes on the edge of the
display panel do not light up at all
and Power-On Self-Test (POST)
completes when the unit is powered
up.**

The light tubes on the edge of the
display panel do not light up at all
and Power-On Self-Test (POST) does
not complete when the unit is
powered up.**

System is in Suspend mode. Press any key or touch the Touch

Pad.

Display function was switched to the
external monitor.

Using 1024 × 768 or higher
resolution on external monitor and
have toggled back to internal
display, which supports up to
800 × 600.

Improper backlight or display

Use Fn + F2 to switch between LCD
or CRT.

Restart the computer.

Replace the display assembly.

cable connections

Defective inverter board. Replace the display assembly.

Defective display cable. Replace the display assembly.

Defective display panel. Replace the display assembly.

Defective system board. Replace the system board.

Defective system board. Replace the system board.

Backlight (brightness) cannot be
adjusted with Fn + F7 (¯ ) or

Improper display cable
connections.

1. Reseat the display cable to the
system board.

Fn + F8 (- ).***

2. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective display cable. Replace the display assembly.

Defective system board. Replace the system board.

Defective inverter board. Replace the display assembly.

Defective display cable. Replace the display assembly.

Defective system board. Replace the system board.

** This problem indicates that the backlight or its power circuitry has failed. Since you cannot observe the POST
result on the display panel when the backlight is not functioning, connect the unit to an external monitor before
powering the unit up. If an external monitor is not available, verify that POST completes by opening and closing
the display, listening for the single or double beep, and watching for the LEDs turn on at the front of the
computer.

This display panel has a continuous pattern
across it (e.g., a "jailbars" pattern), has a

Improper display cable
connections

Reseat the display cable to the

following until the problem is solved:
single color on it, or has garbled graphics
across the entire panel. This failure is for

1. System board

patterns across the entire panel (not just
on one section).

2. Display assembly

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (5 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Defective display cable. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective system board. Replace the system board.

To perform a "self-test" on an external VGA color monitor, complete the following steps: The screen

NOTE:

should be white. A narrow black border may also appear on the left and right sides of the display. Either
of these displays indicates that the monitor is working properly.

Solving Hard Drive Problems

Some common causes and solutions for hard drive problems are listed in the following table.

CAUTION:

at all times, in case of errors or failures.

Problem Probable Cause Solution(s)

Reading hard drive takes an
unusually long time after restarting
the computer.

Hard drive error occurs. Hard drive has bad sectors or has

Hard drive does not work. Hard drive is not seated properly. Turn off and unplug the computer,

To prevent loss of information, always maintain an up-to-date backup of your hard drive

Solving Hard Drive Problems

System entered Hibernation due to
low battery condition and is now
exiting from it.

Give the system time to restore the
previously saved data to its exact
state before Hibernation.

Run Computer Checkup.

failed.

remove the battery pack, and
remove and then reinstall the hard
drive.

Solving Hardware Installation Problems

Some common causes and solutions for hardware installation problems are listed in the following table.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (6 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Solving Hardware Installation Problems

Problem Probable Cause Solutions(s)

A new device is not recognized as part
of the computer system.

Cable(s) of new external device are
loose or power cables are

Ensure that all cables are properly
and securely connected.

unplugged.
Power switch of new external device

is not turned on.

Turn off the computer, turn on the
external device, then turn on the
computer to integrate the device
with the computer system.

Device is not seated properly. Turn off the computer and reinsert

the device.

Solving Keyboard/Numeric Keypad Problems

Some common causes and solutions for keyboard/numeric keypad problems are listed in the following table.

Solving Keyboard/Numeric Keypad Problems

Problem Probable Cause Solution(s)

Embedded numeric keypad on computer
keyboard is disabled.

Embedded numeric keypad is disabled and
Num Lock function is on.

Num Lock function is not enabled. Press the Shift + NumLk keys to

enable the Num Lock function and
embedded numeric keypad. The
Num Lock icon on the status panel
turns on.

External numeric keypad is
connected to the computer.

Disconnect the external numeric
keypad from the computer.

Solving Memory Problems

Some common causes and solutions for memory problems are listed in the following table.

Solving Memory Problems

Problem Probable Cause Solution(s)

Memory count during Power-On Self-Test
(POST) is incorrect.

"Out of Memory" message is displayed on
the screen or insufficient memory
error occurs during operation.

Optional memory expansion card
is installed incorrectly,
is incompatible with the computer,
or is defective.

System ran out of memory for the
application.

Ensure that the optional memory
expansion card is installed
correctly.

Check the application
documentation for memory
requirements.

Install additional memory.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (7 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Solving Minor Problems (continued)

1.800.AT.COMPAQ

privacy and legal statement

Too many TSR (terminate-and
stay-resident) applications are
running.

Remove from memory any TSR
applications that you do not need.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/solving.html (8 of 8)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Contacting Compaq Support

Obtain the following information before contacting Compaq Reseller Support:

Product name
Product serial number
Purchase date
Conditions under which the problem occurred
Any error messages that have occurred
Hardware configuration
Type of printer connected
Hardware/software being used
Printed result of Computer Checkup (TEST)
Printed copies of CONFIG.SYS and AUTOEXEC.BAT files, if possible

Shipping Preparation

To ship the computer, complete the following steps:

1. Back up the critical hard drive files. Ensure that backup tapes/diskette are not

exposed to electrical or magnetic fields while stored in transit.

2. Turn off the computer and external devices.

3. Disconnect the external devices from their power sources, then from the computer.

IMPORTANT:

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/compaq1.html (1 of 2)6/27/2004 5:05:13 AM

Ensure that there is no diskette in the diskette drive and that there are no
PC Cards in the PC slots.

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

4. Close the display and all exterior doors of the computer.

5. Pack the computer with sufficient packing material to protect it. Use the original

packing box or similar packaging.

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/compaq1.html (2 of 2)6/27/2004 5:05:13 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Boards

United States June 27, 2004

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

Miscellaneous
Parts

Documentation
and Software

Description Spare

1.

Processors

Part
Number

Pentium II/266-MHz w/512K Cache 400779-001

Hard Drive/Battery Charger

2.

Board w/RTC Battery

3. Modem w/Shield, 56.0 Kbps

Data/Fax

4.

Low Voltage Differential
Signal Board (For 13.3'
Display Panel)

5.

Voltage Converter Board 331413-

PC Card Assembly 102123-

6.

Fan Assembly

7.

(Not Shown)

331412­001

331429­001

331411­001

001

001

331410­001

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20checked...10%201915%201919%201920%201922%201925/boards.html6/27/2004 5:05:15 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Display Panel Assembly

United States June 27, 2004

System Unit

Boards

Display Panel
Assembly

Mass Storage
Devices

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

Miscellaneous
Parts

Documentation
and Software

Description Spare Part

Number

Display Panel
Assembly w/Cable

13.3 inch TFT

Display Panel
Assembly w/Cable
and Connector,

12.1 inch TFT

331409-001 or
140666-001

331408-001 or
140665-001

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MAN UALS/COMPAQ%20_%20checked...0%201915%201919% 201920%201922%201925/ display.html6/27/2004 5:05:16 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905 , 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Mass Storage Devices

United States June 27, 2004

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

Miscellaneous
Parts

Documentation
and Software

Description

1. Diskette
Drive w/
cable 1.44
MB, 3.5 inch

2. LS-120
Drive

3. Hard Drive

4.8-GB

6.4-GB

4.0-GB

6.4-GB

10-GB

Model

No.

1905,
1906,
1910,
1915,
1919 &
1920

1922 &
1925

1905,
1906,
1910,
1915,
1919,
& 1920

1905,
1906,
1910,
1915,
1919,
& 1920

1922 &
1925

1922 &
1925

1922 &
1925

Spare

Part

Number

331428­001

TDB

331415­001

331416­001

140672­001

140673­001

140674­001

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...0%201915%201919%201920%201922%201925/mass.html (1 of 2)6/27/2004 5:05:16 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905 , 1906, 1910, 1915, 1919, and 1920

1.800.AT.COMPAQ

privacy and legal statement

DVD Drive w/
Interface
Connector

24X CD Drive
w/cable

1905,
1906,
1910,
1915,
1919,
& 1920

1922 &
1925

1905,
1906,
1910,
1915,
1919,
& 1920

1922 &
1925

331427­001

140682-002

102122­001

TBD

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...0%201915%201919%201920%201922%201925/mass.html (2 of 2)6/27/2004 5:05:16 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Miscellaneous Parts

United States June 27, 2004

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Cables

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

Miscellaneous
Parts

Documentation
and Software

Description Spare Part

1. AC 45W Adapter 358976-001

2. Integrated
10/100BaseT
Ethernet Port
Replicator

Miscellaneous
Screw Kit
(Not Shown)

Y Cable Assembly
(Not Shown)

Number

331407-001 or
140663-001

331422-001

102422-001

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20checked...%201915%201919%201920%201922%201925/miscella.html6/27/2004 5:05:19 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Documentation and Software

United States June 27, 2004

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Hardware and
Plastics Kit

Miscellaneous
Hardware and
Plastics Wedge
Kit

Miscellaneous
Parts

Documentation
and Software

Description Spare Part Number

Quick Restore CD 1

122314­001
122314­161
122314-

US/PR
Mexico
APD
PRC
Korea
AUS
Japan
UK
France
Italy
Belgium

371
122314­AA1
122314­AD1
122314­371
122314­291
122314­031
122314­051
122314­061
122314­AK1

Quick Restore CD 2

Reference Guide

Quick Reference Guide Not Available

QuickFind for Windows, North America, Latin America, Asia Pacific Not Available

QuickFind for Windows, Europe, Middle East, Africa Not Available

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20ch ec...201915%201919%201920%201922%201925/docume.html (1 of 2)6/27/2004 5:05:20 AM

Belgium

117894-001 US/PR

122314­KK1

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

QuickFind is updated monthly. To complete the QuickFind part number, add the suffix from the
table below for the desired month. If you do not specify the 3-digit suffix, the default is the
current month in which the order is placed.

QuickFind Part Number Suffix

Suffix Month Suffix Month

-001 January -007 July

-002 February -008 August

-003 March -009 September

-004 April -010 October

-005 May -011 November

-006 June -012 December

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20ch ec...201915%201919%201920%201922%201925/docume.html (2 of 2)6/27/2004 5:05:20 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Electrostatic Discharge

A sudden discharge of static electricity from a finger or other conductor can destroy static­sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage
occurs. An electronic device exposed to electrostatic discharge (ESD) may not be affected at
all and will work perfectly throughout a normal cycle. Although, it may function normally for
a while, then degrade in the internal layers, reducing its life expectancy.

Networks built into many integrated circuits provide some protection, but in many cases, the
discharge contains enough power to alter device parameters or melt silicon junctions.

Generating Static

The table shows how different activities generate static electricity and at different
electrostatic voltage levels.

Typical Electrostatic Voltages

Relative Humidity

Event 10% 40% 55%

Walking across carpet 35,000 V 15,000 V 7,500 V
Walking across vinyl floor 12,000 V 5,000 V 3,000 V
Motions of bench worker 6,000 V 800 V 400 V
Removing DIPS from plastic tubes 2,000 V 700 V 400 V

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/electro.html (1 of 2)6/27/2004 5:05:21 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Removing DIPS from vinyl trays 11,500 V 4,000 V 2,000 V
Removing DIPS from Styrofoam 14,500 V 5,000 V 3,500 V
Removing bubble pack from PCBs 26,000 V 20,000 V 7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
NOTE: 700 volts can degrade a product.

Return to Removal & Replacement Procedures

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/electro.html (2 of 2)6/27/2004 5:05:21 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Service Considerations

Listed below are some of the considerations that you should keep in mind during the
disassembly and assembly of the computer.

Tool and Software Requirements

To service the computer, you need the following:

5 millimeter nut drivers (for screwlocks and standoffs)
Small, Phillips (P-Zero) screwdriver
Small, standard screwdriver
Small, pair of tweezers
Diagnostics software

Screws

The screws used in the computer are not interchangeable. If an incorrect screw is used
during the reassembly process, it can damage the unit. Compaq strongly recommends that
all screws removed during disassembly be kept with the part that was removed, then
returned to their proper locations.

IMPORTANT:

As each subassembly is removed from the computer, it should be placed
away from the work area to prevent damage.

Return to Removal & Replacement Procedures

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/service.html (1 of 2)6/27/2004 5:05:22 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/service.html (2 of 2)6/27/2004 5:05:22 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

United States June 27, 2004

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Cables and Connectors

Most cables used throughout the unit are ribbon cables. Cables must be handled with extreme care to
prevent damage. Apply only the tension required to seat or unseat the cables during insertion or
removal from the connector. Handle cables by the connector whenever possible. In all cases, avoid
bending, twisting, or tearing the cables, and ensure that the cables are routed in such a way that they
cannot be caught or snagged by parts being removed or replaced.

Cables

Use the following precautions when handling cables to avoid damage to the cable or computer:

Always handle cables by their connectors.
Avoid bending, twisting, or pulling on the cables.
Apply minimum required force when seating or unseating the cables from their
connectors.
Place the cables in such a manner that they cannot be caught or snagged by parts
being removed or replaced.
Handle flex cables with extreme care; they can tear easily.

CAUTION: When serving these computers, ensure that cables are placed in their proper
location during the reassembly process. Improper cable placement can cause severe damage to
the unit.

Select the desired illustration.

Removing a cable from a ZIF Connector .

The cable position for the speaker assembly.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/cables1.html (1 of 2)6/27/2004 5:05:22 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

Plastic Parts

Plastic parts can be damaged by the use of excessive force during disassembly and reassembly. When
handling the plastic parts, use care. Apply pressure only at the points designated in the maintenance
instructions.

Return to Removal & Replacement Procedures

1.800.AT.COMPAQ

privacy and legal statement

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/cables1.html (2 of 2)6/27/2004 5:05:22 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920

COMPAQ

STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |

Maintenance & Service Guide

Presario 1900 Series

Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925

Home Page | Notice | Preface | Product Description | Troubleshooting

|

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removing the Battery Pack

United States June 27, 2004

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack

Hard Drive

Keyboard

Memory
Module

Modem

Heatspreader

Processor

Display Panel
Assembly

Upper CPU
Cover with
Palmrest and
TouchPad

Hard Drive/
Battery
Charger Board

Converter
Board

To remove the
battery pack,
complete the
following steps:

1.

Prepare the
computer for
disassembly .

2.

Turn the unit
over.

Slide the

3.

battery pack
release button
located in the
center of the
bottom of the
unit.

Locate the

4.

battery pack on
the right, place
your thumb in
the groove, and
pull the battery
pack forward
from the unit.

To replace the battery
pack, complete the
following step.

file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20che...201915%201919%201920%201922%201925/BPack.html (1 of 2)6/27/2004 5:05:25 AM