HP 4100 manual Power/Battery, Call Center Suggestions, Repair Center Likely Causes

Symptom

Sluggish startup or shutdown

Password has been forgotten

Power/Battery

Short battery operating time

Does not run on battery, empty battery indication

Battery does not charge

Second battery does not work, main battery works

Battery indicator is inaccurate

Display

Dark display, no light

White display

Call Center:

Suggestions

Run ScanDisk and Disk Defragmenter to check and optimize the hard drive.

Delete temporary and unneeded files.

Verify proper ownership, then follow the removal procedure with the owner and log the appropriate data—see page 5-1.

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.

Check battery contacts. If available, try another battery.

Check the power source.

Check battery contacts. If available, try another battery and ac adapter.

Check for high ambient temperature and blocked air vents.

Try swapping the two batteries.

Check contacts on second battery.

Second battery does not charge until main battery is fully charged.

Completely charge and discharge the battery 2 to 4 cycles in the unit.

Adjust display brightness. Press Fn+F5 several times. Try external monitor.

Adjust display brightness.

Repair Center: Likely Causes

Battery.

Motherboard.

Battery or contacts. Motherboard.

Battery or contacts. AC adapter. Motherboard.

Fan.

DC-DC PCA.

Second battery or contacts.

Motherboard.

Motherboard.

LCD module (backlight).

LCD cable or connections.

Inverter PCA.

LVDS PCA.

LCD module.

Inverter PCA.

LVDS PCA.

Repair Center:

Comments

Use same suggestions shown at left.

The user must call Technical Support and provide proof of ownership. Password removal is restricted to certain sites. See page 5-1.

Battery capacity often decreases after a year or more.

Check ac adapter.

Check fan.

Try cycling the battery charge.

If an external monitor displays no image, replace the VGA PCA instead, then motherboard.

3-6 Troubleshooting and Diagnostics HP OmniBook 4100