HP Presario 1600 Presario 1650 Series Maintenance and Service Guide - Page 29

Maintenance & Service Guide

Presario 1600 Series

Models: 1650 and 1655

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Home Page

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Notice

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Preface

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Product Description

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Troubleshooting

Illustrated Parts Catalog

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Removal & Replacement Procedures

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Specifications

Pin Assignments

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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 Power-On

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.

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.

Problem

Probable Cause

Solution(s)

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.

Battery pack has partially self-

discharged.

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 Drive Problems

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

Solving CD Drive Problems

Problem

Probable Cause

Solution(s)

CD drive cannot read a compact disc.

Compact disc is upside down or is

improperly inserted in the CD drive.

Open the CD loading tray, lay the

compact 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.

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.

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.

Problem

Probable Cause

Solution(s)

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.


Defective display cable.


Defective display panel.


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.**



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.













**

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.

Problem

Probable Cause

Solution(s)

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







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.

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.

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)

HP Presario 1600 Presario 1650 Series Maintenance and Service Guide - Page 29

Solving Minor Problems - boot

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