3-6 Troubleshooting and Diagnostics HP OmniBook 2100/3000/3100 Symptom Call Center: Repair Center: Repair Center: Suggestions Likely Causes Comments Password has been forgotten Verify proper ownership, then follow the removal procedure with the owner and log the appropriate data—see page 5-1. An OmniBook 3000 may have to be shipped to an HP service center. The user must call Technical Support and provide proof of ownership. Password removal is restricted to certain sites. See page 5-1. OmniBook 3000 fan turns on, no display, cannot reset Audio PCA (rev 1.0). For an OmniBook 3000 with serial number TW745... or lower, replace the audio PCA if it is marked rev 1.0 on the corner of the PCA.
Also, if the smaller of the two connectors on the motherboard for mounting the audio PCA is tilted slightly, replace the motherboard. (Service note 3000-10.) 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 indicator 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. Check ac adapter. Check fan. Secondary battery does not work, main battery works Check secondary-battery contacts. Secondary battery does not charge until main battery is fully charged. Secondary 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 cables or connections. Inverter PCA. LVDS PCA. If an external monitor displays no image, replace the motherboard instead.