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3-6 Troubleshooting and Diagnostics HP OmniBook 4100
Symptom Call Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
Sluggish startup or
shutdown
Run 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
forgotten
Verify 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 of
ownership. Password
removal is restricted to
certain sites. See page 5-1.
Power/Battery
Short battery
operating time
Turn down display
brightness.
Check power management
settings in BIOS Setup. Try
the default settings.
Inform user that certain
applications can cause
excess power usage. (User
can get power monitor from
www.intel.com and monitor
CPU load.)
Heavy modem use can affect
battery operating time.
Battery.
Motherboard.
Battery capacity often
decreases after a year or
more.
Does not run on
battery, empty
battery indication
Check battery contacts. If
available, try another battery.
Battery or contacts.
Motherboard.
Battery does not
charge
Check the power source.
Check battery contacts. If
available, try another battery
and ac adapter.
Check for high ambient
temperature and blocked air
vents.
Battery or contacts.
AC adapter.
Motherboard.
Fan.
DC-DC PCA.
Check ac adapter.
Check fan.
Second battery
does not work, main
battery works
Try swapping the two
batteries.
Check contacts on second
battery.
Second battery does not
charge until main battery is
fully charged.
Second battery or
contacts.
Motherboard.
Battery indicator is
inaccurate
Completely charge and
discharge the battery 2 to 4
cycles in the unit.
Motherboard. Try cycling the battery
charge.
Display
Dark display, no
light
Adjust display brightness.
Press Fn+F5 several times.
Try external monitor.
LCD module
(backlight).
LCD cable or
connections.
Inverter PCA.
LVDS PCA.
If an external monitor
displays no image, replace
the VGA PCA instead, then
motherboard.
White display Adjust display brightness. LCD module.
Inverter PCA.
LVDS PCA.