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HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-7
Symptom Call Center:
Suggestions
Repair Center:
Likely Causes
Repair Center:
Comments
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.
For an OmniBook 4150B,
shut down and restart. During
boot at the F2 prompt, press
F6. This starts a process that
recalibrates the battery
gauge, possibly inproving
operating time. When the
discharge cycle ends, you
may have to unplug and
reconnect the ac adapter to
begin recharging.
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.
Reseat the VGA 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.
Erratic display LCD cable or
connections.
LCD module.
Bright or missing
pixels or lines
See quality statement on
page 5-2.
LCD module.
LCD cable or
connections.
See quality statement on
page 5-2.
For a 13-inch LCD,
noise or
discoloration when
the display is
moved
LCD cable
connection.
Remove the LCD shield and
check the flex cable
connection at the back of the
13-inch LCD module. Two
rubber spacers should be
behind the connector. After
the shield is installed, it
should be taped to the flex
cable. See the caution on
page 2-16. (Service notes
4100-04, 4100-05.)