HP Omnibook 900 Service Manual

HP OmniBook 900 Troubleshooting and Diagnostics 3-1
3 
Troubleshooting and Diagnostics
This chapter includes troubleshooting and diagnostic information for testing the functionality of the
OmniBook and identifying faulty modules:
 · Troubleshooting information
  Troubleshooting the problem (page 3-2).
  Verifying the repair (page 3-3).
  Suggestions for troubleshooting (page 3-4).
 · Diagnostic tools
  OmniBook hardware diagnostic program (page 3-12).
  Power-on self-test (page 3-18).
  Sycard PCCtest...

3-2 Troubleshooting and Diagnostics HP OmniBook 900
Troubleshooting
The suggestions in this section can help isolate and repair the cause of a problem. To ensure quality
repair, HP recommends that you follow the basic troubleshooting steps shown in the illustration
below.
 
 Figure 3-1. Basic Troubleshooting Steps
Troubleshooting the Problem
Record pertinent information about the unit:
  Model and serial number.
  Operating system and version.
  BIOS version.
  Accessories and peripherals used.
Analyze...

HP OmniBook 900 Troubleshooting and Diagnostics 3-3
 · Consider Causes. Keep in mind possible causes for each problem. Use the diagnostic tools and
troubleshooting suggestions to help find possible causes.
  The OmniBook diagnostic program is the primary hardware troubleshooting tool—it tests
most components using automatic and interactive tests. The table on page 3-4 shows how you
can use the different diagnostic tools to isolate the cause.
  The troubleshooting suggestions on page 3-5 include general...

3-4 Troubleshooting and Diagnostics HP OmniBook 900
Suggestions for Troubleshooting
 Table 3-1. Scope of Diagnostic Tools
FunctionOmniBook
Diagnostics
Power-On
Self-Test
Sycard
PCCtest 450
DMI/TopTools
(if installed)
BIOS Setup
BootupTests Describes
(SafeTools)Configures
ProcessorTests
(System menu)Tests Describes
(AssetTools)
MemoryTests
(Memory menu)Tests Describes
(AssetTools)Describes
BatteriesDescribes
(AssetTools)
DisplayTests (Video,
Mem,User menus)Describes
(AssetTools)
Hard diskTests
(IDE...

HP OmniBook 900 Troubleshooting and Diagnostics 3-5
If you can’t isolate the cause of a problem using the diagnostic tools, you can use the suggestions in
the following table to help find the problem.
 Table 3-2. Troubleshooting Suggestions
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
To help determine likely causes, check to see what replaceable modules are involved in the system function and
what roles they play. See the table on page 1-14.
Startup
Does not boot...

3-6 Troubleshooting and Diagnostics HP OmniBook 900
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Sluggish startup or
shutdownRun ScanDisk and Disk
Defragmenter to check and
optimize the hard drive.
Delete temporary and
unneeded files.Use same suggestions
shown at left.
Password has been
forgottenVerify proper ownership, then
follow the removal procedure
with the owner and log the
appropriate data—see page
5-1.The user must call Technical
Support and provide proof...

HP OmniBook 900 Troubleshooting and Diagnostics 3-7
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
W hite display Adjust display brightness. LCD module.
Motherboard.
Erratic display LCD flex cable or
connections.
LCD module.Make sure the LCD module
and flex cable have small
foam pads attached—see
page 2-10.
Bright or missing
pixels or linesSee quality statement on
page 5-2.LCD module.
LCD flex cable or
connections.See quality statement on
page 5-2.
Hard disk
Hard...

3-8 Troubleshooting and Diagnostics HP OmniBook 900
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Keyboard
Some or all keys do
not work properlyKeyboard.
Motherboard.
BIOS IC.Try reinserting the flex cable
in the connector on the
motherboard.
PS/2 keyboard and
mouse with Y-
adapter do not workCheck devices separately. Y-adapter.
PS/2 device.
Motherboard.
Pointing stick
General problems Check settings in Control
Panel.
Check that the pointing stick
is enabled in BIOS...

HP OmniBook 900 Troubleshooting and Diagnostics 3-9
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Audio
Sound does not
playCheck settings in BIOS
Setup.
Increase sound volume
(Fn+UP and software
controls).
Check whether mute is active
(Fn+F7 and software
controls).
Check for sound resource
conflicts in Device Manager
(W indows 95/98) or
Administrative Tools or
Control Panel System
(W indows NT).Speaker.
Motherboard.Check operation using
headphones or external...

3-10 Troubleshooting and Diagnostics HP OmniBook 900
SymptomCall Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
PCMCIA
General problems Make sure Card Executive is
installed for W indows NT.
If the card requires an IRQ,
check that there is one
available.
Check for conflicts or refresh
the device list in Device
Manager (W indows 95) or
Administrative Tools or
Control Panel System
(W indows NT).
Reboot the computer.
Try the card in the other slot
or in another computer.
Check the...