HP Omnibook 4100 4150 Service Manual
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HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-3 · Separate Problems. If there is more than one symptom, separate them into distinct problems. · 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 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 suggestions for repairing units with certain failure symptoms. Swapping easily replaced modules with known-good modules is an ideal way to isolate the cause down to the module level. It is rare for more than one module to be responsible for one failure symptom. Therefore, replacement of more than one module for a particular symptom should be the exception rather than the normal expectation. After replacing a module, it is normal for the unit to be in a confused state and lock up when power is applied. If this occurs, press the system-off button to restart the computer in a known state. Verifying the Repair Before returning the repaired unit to the customer, verify the repair by running the following tests: · Basic Diagnostic Test. Run the basic test of the OmniBook diagnostic program (page 3-13). –and– · Function Tests. Run tests that check the repaired function, such as in the OmniBook diagnostic program (page 3-13). –and– · Failed Tests. Run any other tests that failed during troubleshooting.
3-4 Troubleshooting and Diagnostics HP OmniBook 4100/4150 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 menu)Tests Describes (AssetTools)Configures Floppy driveTests (FDD menu)Tests Describes (AssetTools)Describes KeyboardTests (KBD menu)Tests Describes (AssetTools) PointerTests (Misc menu)Describes (AssetTools)Configures AudioTests (System, Misc menus)Configures SerialTests* (Misc menu)Describes (AssetTools)Configures ParallelTests* (Misc menu)Describes (AssetTools)Configures Infrared Tests† (Misc menu)Describes (AssetTools)Configures PS/2 port Tests† (KBD, Misc menus) USB Tests† (System menu)Describes (AssetTools) Docking portTests (using docks) PCMCIATests (Misc menu)Tests Describes (AssetTools) AC adapterStatus (AssetTools) Docking productsTests ports and internal busStatus (AssetTools)Configures CD-ROM driveTests (IDE menu)Tests (with boot CD)Describes (AssetTools)Configures Other plug-in modulesDescribes (AssetTools) * The diagnostic test is more thorough if you use a loop-back connector.†Use an appropriate external device to exercise the port. See the help text for the tests in the menu.
HP OmniBook 4100/4150 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 1-15. Startup Does not boot on ac or batteryCheck the power source. Push system-off button. Unplug the ac adapter and remove all batteries, then reconnect power. Remove any RAM board and try again. Reinsert and try again.AC adapter. DC-DC PCA. RAM board. CPU module. Motherboard. VGA PCA. LCD module. Hard drive.For an OmniBook 4100 with serial number below TW 84099999, check CPU bottom plate. If plate is less than “Rev 4”, replace bottom plate. Also, make sure a square spacer is installed on top of the CPU top plate at the right-rear corner. (Service note 4100-03C.) Check ac adapter. Remove any RAM boards and retry. If power status light does not turn on, reprogram BIOS, replace DC-DC PCA, replace motherboard. If power status light turns on but display remains off, try external monitor. If monitor shows successful boot, replace LCD module. If monitor shows activity but BIOS does not complete, replace CPU module. If monitor is blank, replace VGA PCA, replace CPU module, replace motherboard. If power status light and display turn on, BIOS completes, but OS does not start from hard disk or from floppy drive, replace CPU module, then motherboard. If OS starts from floppy drive, reload hard drive, replace hard drive. OmniBook 4150 Series model beeps once, spins hard disk, repeats, but does not bootRAM board (OB 4150 Series).Make sure at least one RAM board is installed. Does not boot on battery (boots on ac)Check battery level on battery LEDs. Check battery contacts. If available, try another battery.Battery or contacts. DC-DC PCA. Motherboard.
3-6 Troubleshooting and Diagnostics HP OmniBook 4100/4150 SymptomCall Center: Suggestions Repair Center: Likely Causes Repair Center: Comments Does not boot from floppy driveCheck floppy drive contacts. Try using alternate connection (with or without floppy cable). Check boot order in BIOS Setup. Check that floppy boot is enabled in BIOS Setup.Floppy drive or contacts. Floppy cable. Motherboard. Error message such as “Invalid system disk” or “Auto IDE error”Check for a disk in floppy drive. Remove and reinsert hard drive. Check boot order in BIOS Setup.Hard drive contacts. Hard drive.If unit boots from floppy drive, check for corrupt files on hard drive, reload hard drive, replace hard drive. 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 of ownership. Password removal is restricted to certain sites. See page 5-1. Power/Battery Short battery operating timeTurn down display brightness. Check power management settings in BIOS Setup. Try the default settings. 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. W hen the discharge cycle ends, you may have to unplug and reconnect the ac adapter to begin recharging. Inform user that certain applications can cause excess power usage. (User can get power monitor from www.intel.com and monitor CPU load.) Some PC cards (PCMCIA) draw power even while not in use. Heavy modem use can affect battery operating time.Battery. Motherboard.Battery capacity often decreases after a year or more. For an F1629A OmniBook 4150† with certain serial numbers between TW 84257202 and TW 84358133, check the CPU module to see if it must be replaced—see Service note 4150-01. Does not run on battery, empty battery indicationCheck battery contacts. If available, try another battery.Battery or contacts. Motherboard.
HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-7 SymptomCall Center: Suggestions Repair Center: Likely Causes Repair Center: Comments Battery does not chargeCheck 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 worksTry 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 inaccurateCompletely 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. W hen 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 lightAdjust 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. W hite display Adjust display brightness. LCD module. Inverter PCA. LVDS PCA. Erratic display LCD cable or connections. LCD module. Bright or missing pixels or linesSee 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 movedLCD 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.)
3-8 Troubleshooting and Diagnostics HP OmniBook 4100/4150 SymptomCall Center: Suggestions Repair Center: Likely Causes Repair Center: Comments Hard disk Hard disk never spinsCheck the power source. Remove and reinsert the hard drive. Check the contacts.Hard drive or contacts. Motherboard. Hard drive case (flex cable).If the drive case is damaged, it can prevent proper operation. Hard disk makes clunking or scratching noiseBack up the drive immediately. W as the computer or drive dropped?Hard drive. Check the computer and drive for evidence of customer abuse. Hard disk makes buzzing or whining noiseBack up the drive immediately. Check for alternate noise sources, such as a PCMCIA drive or fan. If a keystroke causes the sound to change, it may be power supply noise.Depends on the source of the noise. Files are corrupted Run a virus scan program. Check the disk surface by running Scandisk (W indows 95/98) or Disk Administrator (W indows NT). Or boot to DOS and run CHKDSK to look for problems, run CHKDSK /f to fix. Use Recovery CD to restore original factory software.Use same suggestions shown at left. Drive capacity is less than normalCheck the disk surface by running Scandisk (W indows 95/98) or Disk Administrator (W indows NT). Check partitions using FDISK (W indows 95/98) or Disk Administrator (W indows NT).Hard drive. Use same suggestions shown at left. Recreate the Hibernate partition, then partition and format the disk. Floppy drive General problems Check floppy module contacts. Try using alternate connection (with or without floppy cable). Check settings in BIOS Setup.Floppy module or contacts. Floppy cable. Motherboard. Keyboard Some or all keys do not work properlyKeyboard. Motherboard. BIOS IC.Try reinserting the flex cable in the connector on the VGA PCA. PS/2 keyboard and mouse with Y- adapter do not workCheck devices separately. Y-adapter. PS/2 device. Motherboard.
HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-9 SymptomCall Center: Suggestions Repair Center: Likely Causes Repair Center: Comments Pointing stick General problems Check settings in Control Panel. Check that the pointing stick is enabled in BIOS Setup.Keyboard assembly. Motherboard.Try reinserting the flex cable in the connector on the VGA PCA. Special TrackPoint driver features not workingIf installed, remove TouchPad driver support using Add/Remove Program. In Mouse Properties, select the IBM TrackPoint driver from the track-point directory under \OmniBook\Drivers.Keyboard assembly. Motherboard. Click button doesn’t workTop case. Motherboard. For an OmniBook 4100: Drifting or erratic pointer using pointing stickFor an OmniBook 4100, check whether serial number is between TW 82000000 and TW 83599999.Keyboard assembly. For an OmniBook 4100 with serial number between TW 82000000 and TW 83599999, check the date code on the bottom of the keyboard. If the date code is “828”, replace the keyboard. (Service note 4100-02.) Touch pad General problems Check settings in Control Panel. Check pointing stick settings in Control Panel. The IBM TrackPoint driver can redefine touch pad operation. Check that the touch pad is enabled in BIOS Setup.Top case. Motherboard. Special TouchPad driver features not workingIf installed, remove IBM TrackPoint support using Add/Remove Program, then in Mouse Properties, select the standard PS/2 mouse. Disable the pointing stick in BIOS Setup, enable the touch pad. Run Setup.exe from the touch-pad subdirectory under \Omnibook\Drivers.Top case. Motherboard. Click button doesn’t workTop case. Motherboard.
3-10 Troubleshooting and Diagnostics HP OmniBook 4100/4150 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 (mute button 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).Speakers. VGA PCA (OB 4150†). Motherboard.Check operation using headphones or external speakers (audio jack PCA). Sound does not recordCheck settings in BIOS Setup. Check software controls for microphone—it should not be muted in recording panel. Note: The microphone should normally be muted in the master output panel.Inverter PCA (mic). Motherboard. VGA PCA (OB 4150†).Check operation using external microphone (audio jack PCA). Serial/Parallel General problems Check settings in BIOS Setup. Check settings in Control Panel (and in W indows NT Diagnostics).Motherboard. Use loop-back connector during test—see page 3-15. Infrared General problems Infrared communication is not supported in W indows NT 4.0. Infrared is disabled and no drivers installed as shipped. (Drivers are included.) Check settings in BIOS Setup. Standard IrDA and fast-IrDA are incompatible (they use different drivers). For fast-IrDA, check for DMA conflict with ECP parallel port.IR PCA. Motherboard. USB General problems USB is not supported in W indows NT 4.0.Motherboard.
HP OmniBook 4100/4150 Troubleshooting and Diagnostics 3-11 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 OmniBook website for installation instructions (page vi). Download current drivers from the card manufacturer’s website.Motherboard. PCMCIA socket.Using a flashlight, look for bent pins inside the PCMCIA socket. If both slots have problems, replace the motherboard. If only one slot has a problem, try replacing the PCMCIA socket. AC adapter Does not power the OmniBookTry another ac adapter, if available.AC adapter. DC-DC PCA. Motherboard.The ac adapter is not repairable—it must be replaced. Miscellaneous Clock loses time Plug in ac adapter for 24 hours to charge backup battery.Motherboard. Charge backup battery. Computer gets hot It is normal for the computer to get hot. Make sure the air vents are clear. DOS games and other programs that drive CPU usage toward 100% can contribute.Fan. Thermal connections. Heatsink damage.Check the fan. Check for proper contact between CPU and its top plate, and between heatpipe and heatsink.
3-12 Troubleshooting and Diagnostics HP OmniBook 4100/4150 SymptomCall Center: Suggestions Repair Center: Likely Causes Repair Center: Comments Computer pauses or runs sluggishlyMay be normal W indows behavior (background processing can affect response time). If the hard disk has spun down to conserve power, it can take several seconds to spin up. You can hear this. You can run BIOS Setup and change the hard disk time- out to match the Suspend time-out. Certain background operations (such as HP COE virus scans) can affect performance while they’re running. Some file browsers may be unresponsive while they’re processing a graphic image or waiting for broken network connections to time out. Check for overheating—see the previous symptom. Run BIOS Setup and try turning off smart CPU mode.CPU module. Motherboard.If computer slows after a period of continuous activity, check thermal connections and parts—see the previous symptom. Accessories Docking product I/O problemsCheck that ac power is connected. Check settings in BIOS Setup. Try using the corresponding OmniBook port.Docking product. Motherboard.Test the corresponding OmniBook ports while undocked. The port replicator and mini dock are not repairable—they must be exchanged. The docking system is repairable—see its service manual. For an F1629A OmniBook 4150† with certain serial numbers between TW 84257202 and TW 84358133, check the CPU module to see if it must be replaced—see Service note 4150-01. Can not boot from CD in CD-ROM driveCheck that the CD is bootable. During boot, do not press ESC before the F2 prompt— or check boot order in BIOS Setup.CD-ROM drive. The CD-ROM drive is not repairable—it must be exchanged. General plug-in module problemsCheck module contacts. Push system-off button.Plug-in module or contacts. Motherboard.Plug-in modules are not repairable—they must be exchanged. † Models called 4150† in this manual have no marking in the serial number, whereas models called 4150B have 4150 B after the serial number.