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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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.

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Port Replicator Components

Power Management

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

For content comments or questions, contact the Editor.

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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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.

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

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First Edition (Oct. 1998) Compaq Computer Corporation

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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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-

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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Preliminary Steps Clearing the Power-

On 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.

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NOTE:

If the problem is intermittent, check the computer several times to verify that the problem is solved.

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Miscellaneous Parts

Documentation and Software

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

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

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bottom of unit.

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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 Modem Heatspreader Processor Display Panel

Assembly

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

on bottom of unit.

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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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

| 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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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Connector Pin Signal

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

Data

Not defined

Ground

+5 VDC

Clock

Not defined

External VGA Monitor Connector

Connector Pin Signal

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Red Analog

Green Analog

Blue Analog

Not connected

Ground

Ground Analog

Not connected

Ground

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

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Connector Pin Signal

Unused

Tip

Ring

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

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Battery

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Battery Pack Operating Time

This section covers the following information concerning battery pack operating time:

● Increasing battery pack operating time

● Conditioning a battery pack

● Disposing of a used battery pack

Increasing Battery Pack Operating Time

Battery pack operating time differs depending on several variables. To avoid unnecessary replacement, consider the following variables when determining how long a charged battery pack should last:

● Power management settings

● Hardware configuration

● Software applications

● Installed options

● Display brightness

● Hard drive usage

● Changes in operating temperature

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Battery

● Type and number of installed PC Cards

NOTE:

The power consumption requirements for PC Cards vary widely. Some cards drain the battery pack very rapidly.

Battery pack operating time can be increased by as much as 50 percent by controlling the energy required by the computer and the energy stored in the battery pack.

Minimizing the Energy Required

To minimize the energy required by the computer, follow these steps:

● Set the power conservation levels in the Power Management utility to Maximum .

● Customize the timeout value to work more efficiently with the applications. The amount of battery life depends on the values

selected.

Maximizing the Energy Stored

To maximize the energy stored in the battery pack, follow these guidelines:

● Condition the battery pack at least every 30 days to improve overall battery performance.

● Keep a battery pack in the computer when using it with AC power to supply the battery pack with a constant trickle charge.

● Store the battery pack in a cool, dry place when not in use.

Conditioning a Battery Pack

CAUTION: To avoid a loss of data, ensure that all data is saved before discharging a battery pack.

To condition a battery pack, complete the following steps:

1. Plug in the AC adapter and allow the battery to charge until the fast charge arrow on the display disappears. Your battery gauge may

read 100 percent for a period of time before the arrow disappears. Do not unplug the AC adapter until the arrow disappears.

2. Unplug the AC adapter and allow the battery to drain until the computer reaches hibernation and turns itself off.

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Battery

CAUTION: Do not plug the AC adapter during this process or you will need to restart with step number

1. You may use the computer while the battery is draining.

3. Your battery is re-conditioned.

4. Plug in the AC adapter and begin using the computer.

The table below shows battery pack charge times by model.

Battery Charge Time

Computer On Line Off Line

Li ion Battery Pack 4.5 hours premature termination 2:50 hr

Disposing of a Used Battery Pack

In the interest of safeguarding our environment. Compaq Computer Corporation recommends that nickel metal hydride (NiMH) and lithium ion (Li ion) battery packs be recycled. Battery packs should be handled in accordance with country, state, province, or local regulations.

CAUTION: Never attempt to open or service a battery pack. Opening a battery pack not only damages the pack and makes it unusable, but also expose potentially harmful battery components.

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Compaq Discovery 1900 Series Portable Computer Models

Model 1905

Model 1906

Display

12. 1" TFT 12. 1" TFT

Processor

Intel Celeron/266-MHz w/128K Cache

Hard Drive

4.0-GB 4.0-GB

Modem

56.0 Kbps PCI Data/Fax 56.0 Kbps PCI Data/Fax

CD Drive

24X CD-ROM 24X CD-ROM

Model 1910

Model 1915

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

Pentium II/266-MHz w/512K or 256K 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

56.0 Kbps PCI Data/Fax or

56.0 Kbps PCI Data/Fax (International)

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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

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Controls and Lights

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

Backlight Switch Button

10. Left TouchPad Button

3.Instant

Internet Access Button

11. Power (On/Off) Light

4.Instant

Search Button

12. Scroll (Up/ Down) Button

5. Power

(On/Off) Button

13. Battery Charge Light

6. Instant

ECommerce (or Favorite Website) Button

14. Display Panel Release Button

7. Instant

E-Mail Button

15. Right TouchPad Button

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Power Management

Keyboard

16. Integrated Speakers

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Status Panel Lights

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

Status

Panel Lights

1. AC Adapter Light

2. Num Lock Light

3. Caps Lock Light

4. Scroll Lock Light

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Port Replicator Connectors

Port Replicator Components

Power Management

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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 and Top Wedge Components

Right Side Wedge Components

Rear Connectors

Port Replicator Connectors

Left Side

Components

1. Security Lock

2. Air Vent

3. PC Card Slots

4. PC Card Eject Levers

5. Hard Drive

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Port Replicator Components

Power Management

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Bottom of Unit

Left Side and Top Wedge Components

Right Side Wedge Components

Rear Connectors

Port Replicator Connectors

Right Side

Components

1. Battery Compartment

2. Volume Up/ Down Button

3. Headphone Jack

4. Microphone Jack

5. Air Vent

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Port Replicator Components

Power Management

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Left Side and Top Wedge Components

Right Side Wedge Components

Rear Connectors

Port Replicator Connectors

Bottom

of Unit

1. Wedge Interface Connector

2. Keyboard Eject Switch

3. Battery Release Lever

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Port Replicator Components

Power Management

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Rear Connectors

Port Replicator Connectors

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

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Port Replicator Components

Power Management

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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 Wedge Components

Rear Connectors

Port Replicator Connectors

Right Side

Components

of the

Removable

Drive

Wedge

1. Wedge Release Button

2. Diskette Drive or LS120 Drive Slot

3. Diskette Drive or LS120 Drive Eject Button

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Port Replicator Components

Power Management

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Right Side Wedge Components

Rear Connectors

Port Replicator Connectors

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

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Port Replicator Components

Power Management

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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Port Interface

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Rear Connectors

Port Replicator Connectors

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

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Port Interface

Port Replicator Components

Power Management

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

Power Management

Compaq Presario 1900 Series Portable Computers are equipped with Advanced Power Management (APM). This management system allows you to conserve battery power and customize the power saving settings to suit your individual needs.

● Power Management Settings

● Sleep

● Hibernation

● Rebooting After a Lockup

● Servicing Your Computer - Full Off Mode

Power Management Settings

Depending on your patterns of computer use, you can set different conditions, or Power Schemes, under which the computer will go into Sleep mode.

The optional settings are Home/Office Desk , Portable/Laptop , and Always

On .

From the default settings, you can change the following settings.

● When the computer goes into Sleep (Standby) mode

● When the screen times out and goes blank

● When the hard drive slows down

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Port Replicator Connectors

Port Replicator Components

Power Management

NOTE:

The setting for the hard drive must be less than or equal to the setting for the computer.

IMPORTANT:

If you are connected to a network, Compaq recommends you set System Standby to Never .

Sleep

Sleep mode is a low power mode, also referred to as Standby mode.

CAUTION: While in Sleep mode, your computer will maintain system information and open files. Unsaved

information will be lost if you turn off your system prior to system wake-up, or if you lose power while using the AC adapter .

Hibernation Mode

Hibernation mode occurs by pressing the Power button once. Your computer saves the content of your computer

memory to the hard drive. This is followed by the computer turning off.

The following table shows the conditions and indicators for getting in and out of the various power modes: Sleep, Hibernation, and Off.

Mode To Start To End Indicators Sleep

Manual - Fn+F4 key combination

Press any key or move the mouse

Flashing Power LED

Time-Out Default 15 minutes. If using battery power, system will not go to Sleep if on AC power

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Hibernate

Manual - Press Power Button once

Press Power button once

No Power LED, blank screen

Time Out Default - if low battery or after 1 hour of Sleep (system will not Hibernate if on AC power)

Off

Perform normal Windows shutdown using the Start button, or press and hold down the Power button for 4 seconds

Press Power button once

No Power LED, blank screen

Rebooting After a Lockup

Occasionally you may encounter a non-working keyboard or a locked screen. To restart your computer, press and

hold down the Power button for at least four seconds. This will cause a manual shutdown. Press the Power button once to start the computer.

If the computer still does not restart, follow these steps:

1. Press the Power button and hold it for four seconds to shut the computer down.

2. Remove the battery and unplug the AC power for at least 30 seconds.

3. Reinsert the battery or reconnect AC power and press the Power button once to restart.

Full Off (Main Power Off) Mode

If you need to install or replace components in your computer, you must turn the computer off completely . Follow the instructions above for putting the computer into Standard Off mode. Unplug the computer electrical cord from the outlet and remove the battery if installed.

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preliminary Steps

Before running POST, complete the following preliminary steps:

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

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

2. Run Compaq diagnostics.

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:

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.

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

these ports.

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.

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

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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.

2. Disconnect the

power cord.

3. Remove the battery

pack .

4. Remove the

keyboard.

5. Disconnect the

backlight cable from

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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.

7. Reassemble the

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.

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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:

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:

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

Probable Cause Recommended Action

DMA, timers, etc. Replace the system board.

162-System Options Not Set

Probable Cause Recommended Action

Configuration incorrect Run Computer Setup. CMOS reflects that an invalid

configuration has been set.

Run Computer Setup.

RAM failure 1. Replace the memory modules.

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.

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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

controller

1. Run Computer Checkup (TEST).

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.

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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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)

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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.

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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:

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

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

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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.

2. Replace the system board and retest.

202-xx Memory system ROM checksum

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

retest.

2. Install a new memory module and retest.

204-xx Address test failed 211-xx Random pattern test failed 214-xx Noise test failed 215-xx Random address test failed

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Keyboard Test Error Codes

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

disconnected, turn off the computer and connect the keyboard.

2. Replace the keyboard and retest.

3. Replace the system board and retest.

301-xx Failed Selftest/Interface Test 302-xx Failed Individual Key Test 304-xx Failed Keyboard Repeat Test

Parallel Printer Test Error Codes

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

2. Check power to the printer.

3. Install the loop-back connector and retest.

4. Check port and IRQ configuration.

5. Replace the system board and retest.

402-xx Failed Port Test

403-xx Printer pattern test failed

Diskette Drive Test

600 -xx

Diskette ID drive types test

failed

1. Replace the diskette media and retest.

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

3. Replace the diskette drive and retest.

4. Replace the system board and retest.

601-xx Diskette format failed 602-xx Diskette read test failed

603-xx

Diskette write, read, compare test

failed 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

699-xx

Diskette drive/media ID error 1. Replace media.

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

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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.

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

Hard drive format bad track test

failed 1709-xx

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 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 501-

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.

502-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 506-xx

Video 80 × 25 mode 8 × 8

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

508-xx

Video 320 × 200 mode color set 0

test failed 509-xx

Video 320 × 200 mode color set 1

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

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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

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.

2403-xx Video attribute test failed 2404-xx Video character set test failed

2405-xx

Video 80 × 25 mode 9 × 14

character cell test failed 2406-xx

Video 80 × 25 mode 8 × 8

character cell test failed 2408-xx

Video 320 × 200 mode color set 0

test failed 2409-xx

Video 320 × 200 mode color set 1

test failed 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

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.

2421-xx ECG/VGC 640 × 200 graphics

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

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

test failed 2424-xx ECG/VGC monochrome text mode

test failed

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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:

Replace the system board and retest.

2468-xx Advanced VGA DAC test

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 connected.

3. Verify that drivers are loaded and properly installed.

3305-xx CD/DVD drive seek test failed

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4. Replace the CD/DVD drive and retest.

5. Replace the system board and retest.

6600-xx ID test failed

6605-xx Read test failed

6608-xx Controller test failed

6623-xx Random read test failed

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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.

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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.

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Computer is beeping and battery LED icon is blinking.

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.

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

Volume is turned down too low. Adjust the volume.

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

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.

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

RTC battery is dead. Replace the RTC battery.

Battery charge does not last as long as expected.

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.

Turn off or disconnect external devices when not using them.

Battery pack is warm to the touch after charging.

Normal warming has occurred due to charging.

No action is required.

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

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.

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Battery pack has partially selfdischarged.

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.

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

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.

Open the CD/DVD loading tray, lay the compact disc or digital versatile disc in it (label side up), then close the tray.

CD is CD Plus or Pregap/Track 0 type.

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.

Check the drive letter in the path statement.

Not enough space is left on the diskette.

Use another diskette.

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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.

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

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.

Press any key or touch the Touch Pad.

Display has overheated. If computer is in direct sunlight,

move it and allow it to cool off.

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Display is blank and the Suspend icon is flashing.

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

Pad.

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

Display function was switched to the external monitor.

Use Fn + F2 to switch between LCD or CRT.

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

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

Restart the computer.

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.**

Improper backlight or display cable connections

Replace the display assembly.

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.

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.**

Defective system board. Replace the system board.

Backlight (brightness) cannot be adjusted with Fn + F7 (¯ ) or Fn + F8 (- ).***

Improper display cable connections.

1. Reseat the display cable to the system board.

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 single color on it, or has garbled graphics across the entire panel. This failure is for patterns across the entire panel (not just on one section).

Improper display cable connections

Reseat the display cable to the following until the problem is solved:

1. System board

2. Display assembly

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Defective display cable. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective system board. Replace the system board.

NOTE:

To perform a "self-test" on an external VGA color monitor, complete the following steps: The screen 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: To prevent loss of information, always maintain an up-to-date backup of your hard drive

at all times, in case of errors or failures.

Solving Hard Drive Problems

Problem Probable Cause Solution(s)

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

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.

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

failed.

Run Computer Checkup.

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

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.

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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 unplugged.

Ensure that all cables are properly and securely connected.

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.

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.

Embedded numeric keypad is disabled and Num Lock function is 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.

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

Ensure that the optional memory expansion card is installed correctly.

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

System ran out of memory for the application.

Check the application documentation for memory requirements.

Install additional memory.

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

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

Solving Minor Problems (continued)

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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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:

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

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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.

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

System Unit

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

1. Keyboards

2. Upper CPU Cover w/Palmrest and TouchPad 331423001 or 140678001

3. Speaker Assembly w/Cable 331420001

4. Battery Pack - Li ion 386500001 140664001

5. CPU Base Assembly Enclosure with System

Board and Speaker Assembly, (Bottom Plastics)

331414001 140671001

U.S. 331419-001 or 140676-001

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CPU Base Assembly Enclosure with Shield, (Bottom Plastics) (Not Shown)

331421001 140679001

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Boards

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

1. Processors

2. Hard Drive/Battery Charger

Board w/RTC Battery

331412001

3. Modem w/Shield, 56.0 Kbps

Data/Fax

331429001

4. Low Voltage Differential

Signal Board (For 13.3' Display Panel)

331411001

5. Voltage Converter Board 331413-

001

6. PC Card Assembly 102123-

001

7. Fan Assembly

(Not Shown)

331410001

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

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Display Panel Assembly

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

331409-001 or 140666-001

Display Panel Assembly w/Cable and Connector,

12.1 inch TFT

331408-001 or 140665-001

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Mass Storage Devices

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

Model

No.

Spare

Part

Number

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

1905, 1906, 1910, 1915, 1919 & 1920

331428001

2. LS-120 Drive

1922 & 1925

TDB

3. Hard Drive

4.8-GB

6.4-GB

4.0-GB

6.4-GB

10-GB

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

1922 & 1925

331415001

331416001

140672001

140673001

140674001

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DVD Drive w/ Interface Connector

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

1922 & 1925

331427001

140682-002

24X CD Drive w/cable

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

1922 & 1925

102122001

TBD

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Miscellaneous Hardware and Plastics Kit

System Unit Boards Display

Assembly Mass Storage

Devices

Miscellaneous Hardware and Plastics Kit

Miscellaneous Hardware and Plastics Wedge Kit

Miscellaneous Parts

Documentation and Software

Miscellaneous Hardware and Plastics Kit

Spare Part Number: 331418-001 (Models:

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

Spare Part Number: 140675-001

(Models: 1922 & 1925)

Description Quantity

1. Display Panel Assembly Hinge Cover, Left 1 each

2. Display Panel Assembly Hinge Cover, Right

1 each

3. CD/DVD Guide Rails 1 each

4. PC Card Placeholder 1 each

5. Display Panel Assembly Hinge Frame (Left and Right)

1 each

6. Heatspreader with Thermal Pad 2 each

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12.1 inch FPC Support Bracket (Not Shown)

1 each

Keyboard Eject Latch (Not Shown) 1 each

TouchPad Switch (Not Shown) 1 each

Scroll Button Switch (Not Shown) 1 each

Battery Eject Latch (Not Shown) 1 each

Display Screw Hole Covers (Not Shown)

4 each

Battery Knob Spring Coil (Not Shown) 2 each

Volume Switch Knob (Not Shown) 1 each

Display Eject Latch (Not Shown) 1 each

RJ11 Jack Assembly (Not Shown) 1 each

Rubber Feet (Not Shown) 2 each

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Miscellaneous Hardware and Plastics Wedge Kit

System Unit Boards Display

Assembly Mass Storage

Devices Miscellaneous

Hardware and Plastics Kit

Miscellaneous Hardware and Plastics Wedge Kit

Miscellaneous Parts

Documentation and Software

Miscellaneous Hardware and Plastics

Wedge Kit

Spare Part Number: 331424-001 (Models:

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

Spare Part Number: 140680-001

(Models: 1922 & 1925)

Description Quantity

1. Diskette Drive Shield 1 each

2. Alignment Pins (Left and Right) 2 each

3. DVD Drive Shield 1 each

4. Eject Mechanism Assembly w/Springs (Left and Right)

2 each

5. Rubber Feet 4 each

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6. Wedge to Port Replicator Interface Board

1 each

7. Reinforcement Bracket 1 each

Top and Bottom Wedge Cover (Not Shown)

331425001

System to Wedge Interface Board 1 each

Eject Plunger Knobs (Not Shown) 2 each

Plunger Spring Coil (Not Shown) 2 each

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Miscellaneous Parts

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

Number

1. AC 45W Adapter 358976-001

2. Integrated 10/100BaseT Ethernet Port Replicator

331407-001 or 140663-001

Miscellaneous Screw Kit (Not Shown)

331422-001

Y Cable Assembly (Not Shown)

102422-001

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

United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Documentation and Software

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

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

122314001 122314161 122314371 122314AA1 122314AD1 122314371 122314291 122314031 122314051 122314061 122314AK1

Quick Restore CD 2

Belgium

122314KK1

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

117894-001 US/PR

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● 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

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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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.

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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

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United States June 27, 2004

COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

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.

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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.

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COMPAQ

Maintenance & Service Guide

Presario 1900 Series

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preparing the Computer for Disassembly

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

Before beginning removal and replacement procedures, complete the following procedures:

1. Disconnect AC power and any external devices.

2. Remove the battery pack.

3. Remove any PC Cards.

4. Remove the wedge.

IMPORTANT:

The battery pack should be removed before performing any internal maintenance on the computer.

WARNING: Metal objects can damage the battery pack as well as the battery contacts in the battery

compartment. To prevent damage, do not allow metal objects to touch the battery contacts. Place only the battery pack for the Compaq Presario 1900 Series Portable Computers into the battery compartment. Do not force the battery pack into the bay if insertion does not occur easily.

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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

CAUTION: Do not crush, puncture, or incinerate the battery pack. Do not open a battery pack, as this

damages the pack, makes it unusable, and exposes potentially harmful battery components. There are no field-serviceable parts located inside the battery pack.

NOTE:

The Compaq Presario 1900 Series Portable Computers have several screws of various sizes which are not interchangeable. Care must be taken during reassembly to ensure that the correct screws are used in their correct location. During removal please keep respective screws with their associate sub-assembly.

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Compaq 1906, 1919, 1922, 1920, 1910 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual