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HP OmniBook 900 Service Manual

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HP OmniBook 900

Service Manual

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Summary of Contents for HP HP OmniBook 900

  • Page 1: Service Manual

    ® HP OmniBook 900 Service Manual For other Service and User Manuals, go to www.ManualDepot.com...
  • Page 2 Hewlett-Packard Co. shall not be liable for any errors or for incidental or consequential damages in connection with the furnishing, performance, or use of this manual or the examples herein.

  • Page 3: Table Of Contents

    Power-On Self-Test ......................3-17 Sycard PCCtest 450 CardBus Card (Optional)..............3-20 Desktop Management Interface (DMI)................3-21 BIOS Setup Utility....................... 3-23 4. Replaceable Parts .......................4-1 5. Reference Information ....................5-1 Password Removal Policy ......................5-1 Hewlett-Packard Display Quality Statement ................5-2 HP OmniBook 900...
  • Page 4 Table 2-9. Removing Bottom Case Components ................2-25 Table 3-1. Scope of Diagnostic Tools ....................3-4 Table 3-2. Troubleshooting Suggestions....................3-5 Table 3-3. OmniBook Diagnostic Error Codes ..................3-14 Table 3-4. POST Terminal-Error Beep Codes ...................3-17 Table 3-5. POST Messages ........................3-18 HP OmniBook 900...

  • Page 5: Replaceable Parts

    Table 3-6. BIOS Setup Menus and Parameters ................. 3-23 Table 4-1. OmniBook Replaceable Parts .................... 4-3 Table 4-2. Assembly-Component Breakdown..................4-6 Table 4-3. Accessory Replaceable Parts....................4-6 Table 4-4. Part Number Reference ...................... 4-7 Table 5-1. OmniBook 900 LCD Guidelines (TFT) ................5-3 HP OmniBook 900...
  • Page 6 Introduction This service manual provides reference information for the HP OmniBook 900. It is intended to be used by HP-authorized service personnel in the installation, servicing, and repair of these products. The manual is designed self-contained. It is intended that you can follow this manual without having equipment available.

  • Page 7: Product Information

    Product Information The HP OmniBook 900 provides desktop-quality performance and expandability in a highly portable form. It uses high-performance component technologies that make it capable of serving as a desktop computer that you can conveniently take anywhere. Table 1-1. OmniBook 900 Models...

  • Page 8: Table 1-2. Product Comparisons

    On, Standby, Suspend, Hibernate, Off. Hibernate, Off. Hibernate, Off. Hibernate, Off. Intel Mobile Pentium or Mobile Pentium II processor. This chapter describes • Features and operation (below). • Specifications (page 1-9). • Internal design (page 1-12). Product Information HP OmniBook 900...

  • Page 9: Features And Operation

    Infrared port Audio jacks Main status lights Hard disk drive Figure 1-2. OmniBook - Side View Kensington Serial Parallel Video Docking Kensington lock slot port port port port lock slot Figure 1-3. OmniBook - Rear View HP OmniBook 900 Product Information...

  • Page 10: Turning The Omnibook On And Off

    No-power/stopped state. Everything is shut down Press and hold the blue power new session. (battery continues charging if ac adapter is button until the display shuts connected). Computer reboots at turn-on and down. restores network connections. Product Information HP OmniBook 900...

  • Page 11: Checking The Status Of The Omnibook

    In addition, the battery module has five lights that indicate its charge level. To view the lights, you have to remove the battery and press the pad on the back next to the connector. The number of lights that turn on indicates the charge. HP OmniBook 900 Product Information...

  • Page 12: Using Fn Hot Keys

    • You select the CD-ROM drive as the boot device. You can do this during reboot by pressing ESC to cancel the OmniBook screen, then ESC to display the boot-device menu for a one- time selection. Product Information HP OmniBook 900...

  • Page 13: System Resources

    A0000 - BFFFF Video C0000 - CBFFF Video BIOS CC000 - DBFFF* Free** DC000*- FFFFF System BIOS * Approximate boundary. ** Valid uses for memory addresses CC000-DBFFF: Upper memory blocks (UMBs). PC card memory windows. HP OmniBook 900 Product Information...

  • Page 14: Table 1-9. System Input/Output Addresses (100-3Ff)

    PCMCIA controller 3F0-3F5 Floppy controller Internal hard disk (primary IDE controller) Floppy controller 3F8-3FF COM1 (serial port) Table 1-10. DMA Channels Sound record Sound playback Floppy drive LPT1 (ECP parallel port) Cascade Free Free Free Product Information HP OmniBook 900...

  • Page 15: Specifications

    4-Mbps IrDA-compliant infrared port. Expandability One Type III or two Type II 16-/32-bit PC Card slots (3.3- and 5-V support). CardBus enabled. External plug-in module bay for accessory modules. Optional port replicator, mini dock, and docking system. HP OmniBook 900 Product Information...
  • Page 16 CPU: Intel Mobile Pentium II processor. South Bridge: PIIX4E. Video: NeoMagic MagicGraph NM2200 (NMG5). Audio: NeoMagic MagicGraph NM2200 (NMG5) and NeoMagic Audio NMA2. CardBus: TI PCI 1225. Keyboard controller: National PC87570. Super I/O: SMC 769. 1-10 Product Information HP OmniBook 900...

  • Page 17: Table 1-12. Omnibook 900 Accessories

    Mini dock (tray: page 4-6) • • • F1453A Monitor stand (short) for F1451A and F1452A • • F1468A Docking module bay adapter • • • F1477A Docking system and monitor stand (tall) (tray: page 4-6) HP OmniBook 900 Product Information 1-11...

  • Page 18: Internal Design

    Cards Motherboard Speaker The power switch and lid Hard Disk switch are contained on Battery Drive the motherboard. All external connections are made to the Keyboard motherboard. (pointing stick) Figure 1-4. Replaceable Module Diagram 1-12 Product Information HP OmniBook 900...

  • Page 19: Table 1-13. Functional Structure

    I/O controller, infrared transmitter/receiver. Motherboard Keyboard controller, PS/2 processor, PS/2 connector. PS/2 port Motherboard Bus controller (South Bridge), USB connector. Motherboard Docking logic, docking connector. Docking port PCMCIA Motherboard PCMCIA controller. PCMCIA socket PCMCIA connectors. HP OmniBook 900 Product Information 1-13...

  • Page 21: Removal And Replacement

    Symbols like this throughout this chapter show approximate full-size screw outlines. You can use them to verify the sizes of screws before you install them. Installing a wrong-size screw can damage the unit. (The symbol at the left represents an M2.5×5mm T-head screw.) HP OmniBook 900 Removal and Replacement...

  • Page 22: Table 2-2. Required Equipment

    HDD case, PCMCIA socket 3.5 – 4.0 3.0 – 3.4 M2.5 (8 mm long) 4.0 – 4.5 3.4 – 3.9 except those in next line 2.0 – 2.5 1.7 – 2.2 for HDD case Removal and Replacement HP OmniBook 900...

  • Page 23: Removing The Battery (User-Replaceable)

    2. Slide the battery’s front panel to the right. 3. Pull the battery out of the bay. Figure 2-1. Removing the Battery Reassembly Notes • Make sure the front panel of the battery is open before inserting the battery. HP OmniBook 900 Removal and Replacement...

  • Page 24: Removing A Ram Board (User-Replaceable)

    Do not touch the heatsink until it has cooled. It could be hot if the computer was running recently. 6. Release the two latches at the sides of the RAM board, so the free edge of the board pops up. 7. Pull the board out of the connector. Removal and Replacement HP OmniBook 900...

  • Page 25: Removing The Hard Disk Drive (User-Replaceable)

    • Small Phillips screwdriver. Removal Procedure 1. Unplug the ac adapter, if present, and remove the battery. 2. Turn the unit bottom side up and remove the hard drive screw from the bottom case. HP OmniBook 900 Removal and Replacement...

  • Page 26: Figure 2-3. Removing The Hard Disk Drive

    Do not cover the vent hole in the top surface of the hard drive or in the case. If you cover the hole, the hard drive could fail prematurely. • The small plastic tabs on the connector face the top of the drive, and the metal shield fits behind the tabs. Removal and Replacement HP OmniBook 900...

  • Page 27: Replacing Small Parts (User-Replaceable)

    Open the door about 45° and flex the door until one side tab releases. Door, hard disk Insert a small flat-blade screwdriver under the foot and pry it loose. To replace, firmly Foot press the adhesive side of the foot into the recess. HP OmniBook 900 Removal and Replacement...

  • Page 28: Removing The Lcd Module (Hp Authorized Service Providers Only)

    8. Lift up the right edge of the LCD module about 90°. 9. Using a small flat-blade screwdriver, insert the tip under the narrow end of the flex cable connector—not the wide end—and twist the screwdriver to release the connector from the LCD module. Removal and Replacement HP OmniBook 900...

  • Page 29: Figure 2-5. Removing The Lcd Module

    If a pad is missing, replace the LCD module. One pad on the LCD flex cable behind the connector that plugs into the LCD module. If the pad is missing, replace the flex cable. HP OmniBook 900 Removal and Replacement...

  • Page 30: Removing The Keyboard (Hp Authorized Service Providers Only)

    Do not touch the heatsink until it has cooled. It could be hot if the computer was running recently. 6. Release the pointing stick flex cable from the motherboard. 7. Release the keyboard flex cable from the motherboard, then remove the keyboard. 2-10 Removal and Replacement HP OmniBook 900...

  • Page 31: Figure 2-6. Removing The Keyboard

    • Fold the keyboard back into place. Slip its front tabs into the slots, then snap the back edge into place. • Push the keyboard toward the back as you tighten the two screws. This helps engage the tab at the back-center of the keyboard. HP OmniBook 900 Removal and Replacement 2-11...

  • Page 32: Removing The Cpu Module (Hp Authorized Service Providers Only)

    4. At the side of the CPU module near the back-right corner, pry up the corner of the CPU module about 1-2 mm. Then pry up the back-left corner. Lift off the CPU module. 2-12 Removal and Replacement HP OmniBook 900...
  • Page 33 Install or replace thermal pads on the heatsink that are missing or damaged. Do not install screws in the middle area of the heatsink. The only screws in the CPU area are at the four corners of the CPU module. HP OmniBook 900 Removal and Replacement 2-13...

  • Page 34: Removing The Display Assembly (Hp Authorized Service Providers Only)

    6. Close the display and turn over the computer. 7. Remove the two screws from the back corners of the bottom case. 8. Open the display about 90°, then lift if off. 2-14 Removal and Replacement HP OmniBook 900...

  • Page 35: Figure 2-8. Removing The Display Assembly

    Figure 2-8. Removing the Display Assembly Reassembly Notes • The flex cable wraps around the post only about 1/2 turn. • Insert the display power wires into the notch in the top case before installing the hinge cover. HP OmniBook 900 Removal and Replacement 2-15...

  • Page 36: Removing The Top Case (Hp Authorized Service Providers Only)

    (2 inches), then pull it forward with your fingers. Pull and work the top case until the middle snap releases. The left hinge support comes off with the top case. The right hinge support stays in the bottom case. 2-16 Removal and Replacement HP OmniBook 900...

  • Page 37: Figure 2-9. Removing The Top Case

    • It may be easier to plug in the touch pad flex cable while you are lowering the top case onto the bottom case—rather than waiting until after the top case is fully installed. HP OmniBook 900 Removal and Replacement...

  • Page 38: Removing The Motherboard Or Bottom Case (Hp Authorized Service Providers Only)

    9. Remove the four hex standoffs in the CPU area. 10. Lift the front of the motherboard about 7 cm (3 inches), then slide the motherboard forward until it comes out of the bottom case. 2-18 Removal and Replacement HP OmniBook 900...

  • Page 39: Figure 2-10. Removing The Motherboard

    Fan. (Do not press or spin the fan blade with your finger.) Mylar insulator (inside the bottom case). • Install the original serial number label and a new overlay—see the steps below if you have to make a new serial number label. HP OmniBook 900 Removal and Replacement 2-19...
  • Page 40 If you installed a new motherboard with a new BIOS IC, the IC contains only enough basic programming to boot the OmniBook. After installing the motherboard, you must reprogram the IC. Hewlett-Packard prefers that you program the IC with the latest BIOS. You can download it from the OmniBook website (see page vi)—follow the directions provided.

  • Page 41: Removing The Bios Ic (Hp Authorized Service Providers Only)

    A replacement BIOS IC contains only enough basic programming to boot the OmniBook. After installing the IC, you must reprogram it. Hewlett-Packard prefers that you program the IC with the latest BIOS. You can download it from the OmniBook website (see page vi)—follow the directions provided.

  • Page 42: Figure 2-11. Removing The Bios Ic

    • Push the keyboard toward the back as you tighten the two screws. This helps engage the tab at the back-center of the keyboard. • Reprogram the IC by programming the BIOS—see the note above. 2-22 Removal and Replacement HP OmniBook 900...

  • Page 43: Removing Other Components (Hp Authorized Service Providers Only)

    2. Remove the additional assemblies and follow the special steps indicated in the tables below. Components are separated into these groups: • Display components (page 2-24). • Top case components (page 2-25). • Bottom case components (page 2-25). HP OmniBook 900 Removal and Replacement 2-23...

  • Page 44: Table 2-7. Removing Display Components

    Latch, display 1. Remove the display bezel (see page 2-8). 2. Remove the two screws holding the latch, then lift out the latch. LCD module See page 2-8. 2-24 Removal and Replacement HP OmniBook 900...

  • Page 45: Table 2-8. Removing Top Case Components

    Remove the eight screws from the heatsink and lift off Heatsink the heatsink. Reassembly Notes: Install or replace thermal pads on the heatsink that are missing or damaged. IC, BIOS See page 2-20. HP OmniBook 900 Removal and Replacement 2-25...
  • Page 46 Support, hinge (right) Hard drive (page 2-5). Remove the screw holding the right hinge support near the back-right corner, then lift out the support. Keyboard (page 2-10). Display (page 2-14). Top case (page 2-16). 2-26 Removal and Replacement HP OmniBook 900...

  • Page 47: Troubleshooting And Diagnostics

     Sycard PCCtest 450 PC Card (page 3-20).  Desktop Management Interface (page 3-21).  BIOS Setup utility (page 3-23). Caution Do not unnecessarily remove the CPU module from the motherboard. The CPU connector is easily damaged during removal and insertion. HP OmniBook 900 Troubleshooting and Diagnostics...

  • Page 48: Troubleshooting

    Using the customer’s information, try to duplicate the problem. Determine how the problem differs from proper behavior. Also, take note of the functions that do work properly. • Separate Problems. If there is more than one symptom, separate them into distinct problems. Troubleshooting and Diagnostics HP OmniBook 900...

  • Page 49: Verifying The Repair

    Run the basic test of the OmniBook diagnostic program (page 3-12). –and– • Function Tests. Run tests that check the repaired function, such as in the OmniBook diagnostic program (page 3-12). –and– • Run any other tests that failed during troubleshooting. Failed Tests. HP OmniBook 900 Troubleshooting and Diagnostics...

  • Page 50: Suggestions For Troubleshooting

    * The diagnostic test is more thorough if you use a loopback connector. † Use an appropriate external device to exercise the port. See the help text for the tests in the menu. Troubleshooting and Diagnostics HP OmniBook 900...

  • Page 51: Table 3-2. Troubleshooting Suggestions

    “Invalid drive. check for corrupt files on Hard drive. system disk” or hard drive, reload hard drive, Remove and reinsert hard “Auto IDE error” replace hard drive. drive. Check boot order in BIOS Setup. HP OmniBook 900 Troubleshooting and Diagnostics...
  • Page 52 LCD module If an external monitor light (backlight). displays no image, replace Press Fn+F5 several times. the motherboard. LCD flex cable, power Try external monitor. cable, or Check for very low ambient connections. temperature. Motherboard. Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 53 Try reseating the external module bay cable and the Accessory floppy module into the bay. cable. Try using alternate External module bay. connection (with accessory Motherboard. floppy cable or external module bay). Check settings in BIOS Setup. HP OmniBook 900 Troubleshooting and Diagnostics...
  • Page 54 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. Click button doesn’t Touch pad. work Top case. Motherboard. Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 55 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. General problems USB is not supported in Motherboard. Windows NT 4.0. HP OmniBook 900 Troubleshooting and Diagnostics...
  • Page 56 Check for proper contact Make sure computer is not between heatsink, thermal resting on a soft surface. pads, CPU, and Northbridge DOS games and other programs that drive CPU usage toward 100% can contribute. 3-10 Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 57 Plug-in module or Plug-in modules are not module problems module, in external bay, on contacts. repairable—they must be cable, and on OmniBook exchanged. External module bay. connector. Motherboard. Push system-off button and reboot. HP OmniBook 900 Troubleshooting and Diagnostics 3-11...

  • Page 58: Diagnostic Tools

    • On an OmniBook with a factory software installation, run diaginst from the \Dmi\Hpdiags directory on the hard disk. –or– If TopTools is installed, use the DiagTools page to create the disk. 3-12 Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 59 If any test fails, the error is logged (error code and description) and displayed temporarily (error code). If several errors occur, look for patterns that might indicate a common cause. See the table HP OmniBook 900 Troubleshooting and Diagnostics 3-13...

  • Page 60: Figure 3-3. Serial And Parallel Loopback Connectors

    0073h Bad CMOS RAM size. Reset the system, then 00A0h No repair. (ESCD not supported.) run BIOS Setup and check settings. Replace 00A1h Replace the BIOS IC. Replace the the motherboard. motherboard. 3-14 Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 61 Make sure the floppy disk is fully inserted. 0220h Replace the motherboard. 03AAh Check the connectors on the floppy drive, 0240h Replace the hard disk. Replace the external module bay, and motherboard. motherboard. Replace the floppy drive. HP OmniBook 900 Troubleshooting and Diagnostics 3-15...
  • Page 62 Select the correct speed replace the speaker. for the device. Replace the motherboard (or Video Tests dock component, if applicable). 0900h - Replace the motherboard. 0920h 8000h (See LCD Test near end of table.) 3-16 Troubleshooting and Diagnostics HP OmniBook 900...

  • Page 63: Power-On Self-Test

    RAM failure on data bits xxxx of low byte of memory bus 1-4-1-1 RAM failure on data bits xxxx of high byte of memory bus 2-1-2-3 Check ROM copyright notice 2-2-3-1 Test for unexpected interrupts HP OmniBook 900 Troubleshooting and Diagnostics 3-17...

  • Page 64: Table 3-5. Post Messages

    You may have to replace the cache. See your dealer. A disabled cache slows system performance considerably. 02F0: CPU ID: CPU socket number for Multi-Processor error. 02F4: EISA CMOS not writeable ServerBIOS2 test error: Cannot write to EISA CMOS. 3-18 Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 65 Displays the address nnnn of the upper limit of Upper Memory Blocks, indicating released segments of the BIOS which can be reclaimed by a virtual memory manager. Video BIOS shadowed Video BIOS copied to shadow RAM. HP OmniBook 900 Troubleshooting and Diagnostics 3-19...

  • Page 66: Sycard Pcctest 450 Cardbus Card (Optional)

    • CardBus (32-bit) test, TESTCB (version 2.05). Requires the CardBus configuration header. Run the test for the Texas Instruments PCI1225 socket controller—suggested commands Upper slot: TESTCB -b69 -1 -v -jsd000 Lower slot: TESTCB -b69 -0 -v -jsd000 -k6 3-20 Troubleshooting and Diagnostics HP OmniBook 900...

  • Page 67: Desktop Management Interface (Dmi)

    OmniBook: • A README.TXT file. • A Windows online help file describing Hewlett-Packard’s implementation of DMI (group and attribute definitions). Since not all Hewlett-Packard enhanced features are supported on all models, this document also describes any restrictions that apply.
  • Page 68 Hewlett-Packard, to define a standard method of managing the physical and logical components of personal computers. Hewlett-Packard has developed a number of extensions to DMI to allow the enhanced features of HP OmniBook computer to be managed with DMI, including features such as passwords and tattooing (identifying a computer using a unique string of characters).

  • Page 69: Bios Setup Utility

    Sets whether internal pointing devices are automatically Auto disabled when an external PS/2 pointing device is detected, or whether both internal and external devices are active. This is required for the scroll wheel on a PS/2 mouse to function. HP OmniBook 900 Troubleshooting and Diagnostics 3-23...
  • Page 70 If boot security is enabled, sets whether a password is stored Disabled Lock on the hard disk. Secures data on the disk if the disk is moved to another computer. Floppy Boot Sets whether the floppy drive is a boot device. Enabled 3-24 Troubleshooting and Diagnostics HP OmniBook 900...
  • Page 71 Load Previous Values Discards Setup changes since last save, stays in Setup. Does not affect Security and date/time changes. Save Changes Saves Setup changes, and stays in Setup. Security settings are saved when changed. HP OmniBook 900 Troubleshooting and Diagnostics 3-25...

  • Page 73: Replaceable Parts

    This chapter contains an exploded view of the OmniBook and the following lists of parts: • OmniBook replaceable parts (page 4-3). • Assembly-component breakout (page 4-6) • Accessory replacement parts (page 4-6). • Part number reference (page 4-7). HP OmniBook 900 Replaceable Parts...

  • Page 74: Figure 4-1. Exploded View

    Display components (see page 4-5). Figure 4-1. Exploded View Replaceable Parts HP OmniBook 900...

  • Page 75: Table 4-1. Omnibook Replaceable Parts

    22 Keyboard, Swiss 5182-5171 22 Keyboard, UK English 5182-5173 22 Keyboard, US English 5182-5165 Label, regulatory F1711-60929 23 Latch, display F1711-60916 24 LCD module (12" TFT, IBM) F1711-60939 F1711-69039 Lens, infrared F1711-60928 Overlay, serial number 7121-7525 HP OmniBook 900 Replaceable Parts...
  • Page 76 These hard drives are the preferred drives at the time of publication. Drives shipped in units are subject to change without notice. For current information about preferred and approved drives for these products, see the latest versions of service notes HDD4G-01 and HDD6G-01. Replaceable Parts HP OmniBook 900...

  • Page 77: Figure 4-2. Display Components

    Figure 4-2. Display Components HP OmniBook 900 Replaceable Parts...

  • Page 78: Table 4-2. Assembly-Component Breakdown

    RAM board, 32MB SDRAM 1818-7413 F1456-69001 RAM board, 64MB SDRAM 1818-7414 F1457-69001 RAM board, 128MB SDRAM 1818-7549 F1622-69001 Tray, docking “D” (OB900 with docking system) F1477-60958 Tray, standard “D” (OB900 with port replicator, mini dock) F1452-60909 Replaceable Parts HP OmniBook 900...

  • Page 79: Table 4-4. Part Number Reference

    Port replicator F1452-60901 Mini dock F1452-60909 Tray, standard “D” (OB900) F1453-60901 Monitor stand (short) F1455-80001 Adapter, auto/airline (75W) F1460-60962 Holder, business card F1460-60984 Screw, M2.5×5mm F1460-60990 Screw, M2.5×4mm F1462-60901 OmniBook Performance 98 Group training kit HP OmniBook 900 Replaceable Parts...
  • Page 80 F1711-60935 Standoff, M2×9mm hex (CPU) F1711-60936 Standoff, 4-40UNC hex (I/O) F1711-60937 Cover, hinge (left, right pair) F1711-60938 Hinge, display (left, right pair) F1711-60939 F1711-69039 LCD module (12" TFT, IBM) F1711-60941 Recovery CD, English (OB900, W95/98) Replaceable Parts HP OmniBook 900...
  • Page 81 These drives are the preferred drives at the time of publication. Drives shipped in units are subject to change without notice. For current information about preferred and approved drives for these products, see the latest versions of service notes HDD4G-01 and HDD6G-01. HP OmniBook 900 Replaceable Parts...

  • Page 83: Reference Information

    It may not be disclosed or distributed outside those locations. Password removal is strictly controlled. Hewlett-Packard and authorized support providers must ensure with written evidence that the OmniBook being “cleansed” is actually in the possession of the unit’s actual and current owner.

  • Page 84: Hewlett-Packard Display Quality Statement

    Hewlett-Packard Display Quality Statement TFT display manufacturing is a high precision but imperfect technology and manufacturers cannot currently produce large displays that are cosmetically perfect. Most, if not all, TFT displays will exhibit some level of cosmetic imperfection. These cosmetic imperfections may be visible to the customer under varying display conditions and can appear as bright, dim, or dark spots.

  • Page 85: Table 5-1. Omnibook 900 Lcd Guidelines (Tft)

    Any occurrence of triple bright dots (or triple dark dots). • Any occurrence of 2 bright or dark dots within 20 mm. Definitions of imperfections: Bright or dark dot: A subpixel (red, green, or blue dot) that is stuck on or off. HP OmniBook 900 Reference Information...
  • Page 88 1. Product Information 2. Removal and Replacement 3. Troubleshooting and Diagnostics 4. Replaceable Parts 5. Reference Information Part Number Printed in U.S.A. 1/99 F1711-90015...

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