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Dell Latitude LM Service Manual

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Dell Latitude LM Service Manual

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  • Page 1 Thank you for purchasing this Factory Service Manual CD/DVD from servicemanuals4u.com. Please check out our eBay auctions for more great deals on Factory Service Manuals: servicemanuals4u...
  • Page 2 ® ® ®...
  • Page 3 Microsoft Corporation; Intel and Pentium are registered trademarks of Intel Corporation; IBM is a registered trademark of International Business Machines Corporation. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own.

  • Page 4: Table Of Contents

    Contents Chapter 1 System Overview....... 1-1 System Features ..........1-1 Physical Description .
  • Page 5 Running the Dell Diagnostics........
  • Page 6 Audio Board ..........4-42 Main Board .
  • Page 7 Figure 4-29. I/R Device Removal ....... 4-36 Figure 4-30. Power Button Removal ......4-37 Figure 4-31.
  • Page 9 This First A prerequisite for using this manual to service Dell portable computers is a basic knowledge of IBM-compatible PCs and prior training in IBM-compatible PC troubleshooting techniques. In addition to information provided in this manual, Dell provides the Reference and Troubleshooting Guide for trouble- shooting procedures and instructions on using the Dell diagnostics to test portable computers, and the online System User’s Guide for information about...

  • Page 12: Chapter 1 System Overview

    This chapter provides an overview of the components and subsystems of these computers. The individual model names within the Dell Latitude LM portable family indi- cate the type and operating frequency of the microprocessor and display used in the computer. For example: •...

  • Page 13: Physical Description

    I/O panel microphone connector AC adapter service tag number connector expansion connector PC Card slots PS/2 connector Figure 1-2. Back View of the Portable Computer Dell Latitude LM Systems Service Manual...

  • Page 14: Status Display

    Status Display Figure 1-3. Status Display Panel The status display panel is located directly above the keyboard. This panel shows icons that indicate keyboard operation or suspend mode; CD-ROM, hard-disk drive, diskette drive, and PC Card activity; and status of the power source (AC power or batteries).

  • Page 15: Diskette-Drive Access Indicator

    The battery status indicator reflects the state of the main or secondary battery in the computer when the computer is off. No indicator means there is no battery (main or secondary) in the computer or, if present, the battery has been discharged. Dell Latitude LM Systems Service Manual...

  • Page 16: Battery Charge Gauge

    If the user forgets the password and does not have it on diskette, the computer cannot be accessed. In that case, the com- puter must be returned to Dell at the user’s expense. Dell technicians will erase the password by shorting C146, recharge the CMOS battery, and send the computer back at the user’s expense.

  • Page 17: System Power

    Turning off the hard-disk drive — To activate this feature, set the HARD-DISK option in the Power Menu of the Setup program. The computer automati- TIME-OUT cally turns the hard-disk drive back on the next time the microprocessor accesses the drive. Dell Latitude LM Systems Service Manual...

  • Page 18: Interrupt Assignments

    nterrupt Assignments Table 1-1. Interrupt Assignments IRQ Line Used/Available IRQ0 Generated by the system timer IRQ1 Generated by the keyboard controller to signal that the key- board output buffer is full IRQ2 Cascade to second interrupt controller IRQ3 Used by the infrared port (COM2) IRQ4 Used by the serial port (COM1) IRQ5...

  • Page 19: Technical Specifications

    Standard RAM ... . 8 MB on system board Maximum RAM ... 40 MB Dell Latitude LM Systems Service Manual...
  • Page 20 Table 1-2. Technical Specifications (Continued) Memory (Continued) Memory access time: tRAC ....70 ns tCAC ....20 ns BIOS address .
  • Page 21 Refresh rate (typical) ..70 Hz Response time (typical) ..300 ms Operating angle ... 0 (closed) to 135 1-10 Dell Latitude LM Systems Service Manual...
  • Page 22 Table 1-2. Technical Specifications (Continued) Dual-Scan Display (Continued) Dot pitch ....0.29 mm Power consumption..3.4 W Controls.
  • Page 23 Storage ....-20 to 50 C (-4 to 122 F) Battery performance features such as charge time, operating time, and life span can vary according to the conditions under which the computer and battery are used. 1-12 Dell Latitude LM Systems Service Manual...
  • Page 24 Weight (with hard-disk drive, diskette drive, battery, and two PC Card blanks): Dell Latitude LM P100SD ... 3.1 kg (6.9 lb) Dell Latitude LM P133ST... . 3.1 kg (6.9 lb)
  • Page 25 Storage ....0 m to 12,192 m (0 ft to 40,000 ft) Measured with the hard-disk drive in head-parked position. 1-14 Dell Latitude LM Systems Service Manual...

  • Page 26: Chapter 2 Initial Procedures

    These procedures can often reveal the source of a problem or indicate the correct starting point for troubleshooting the computer. Dell recom- mends that you perform these initial procedures in the order they are presented.
  • Page 27 9. Open the computer, and verify that it is free of any obvious physical damage. 10. Verify that the keyboard is free of any obvious physical damage and that its keys operate freely. 11. Verify that the touch pad and its associated buttons operate freely. Dell Latitude LM Systems Service Manual...

  • Page 28: Observing The Boot Routine

    Dell recommends that users make copies of the Dell Diagnostics Diskette. For instructions, see “Before You Start Testing” in Chapter 4 of the Dell Latitude LM Refer- ence and Troubleshooting Guide.
  • Page 29 • Any unusual sounds 5. Observe the display for the Diagnostics Menu of the Dell diagnostics. Does the Diagnostics Menu appear on the display? Yes. See “Running the Dell Diagnostics” in Chapter 3.

  • Page 30: Eliminating Resource Conflicts

    Dell for technical assistance. For instructions, see Chapter 5, “Getting Help,” in the Reference and Troubleshooting Guide or the “Contacting Dell” section of the online System User’s Guide.
  • Page 31 Dell Latitude LM Systems Service Manual...

  • Page 32: Beep Codes And Error Messages

    If a faulty computer does not emit beep codes or display system error messages to indicate a failure, you should load the diagnostics and run the appropriate tests to help isolate the source of the problem. See “Running the Dell Diagnos- tics” found later in this chapter.

  • Page 33: Table 3-1. Post Beep Codes

    RAM failure on data bits Faulty memory module or nnnn of low byte on memory faulty main board 2-1-2-3 Check ROM copyright Faulty main board notice failure 2-2-3-1 Interrupt mask register failure Faulty main board Dell Latitude LM Systems Service Manual...

  • Page 34: System Error Messages

    ystem Error Messages The following table lists (in alphabetical order) system error messages that may appear on the display during the boot routine or during normal computer operation. Table 3-2. System Error Messages Message Definition Probable Causes Connector loose or dis- Faulty or incorrectly Diskette drive A kette faulty.
  • Page 35 Faulty main board. set: nnnn CMOS battery dead. Faulty CMOS battery System battery or main board. is dead—Replace and run Setup Primary cache failed. Faulty microprocessor. System cache error—cache disabled Dell Latitude LM Systems Service Manual...
  • Page 36 Table 3-2. System Error Messages (Continued) Message Definition Probable Causes CMOS has been cor- BIOS has been updated. System CMOS rupted or modified, pos- checksum bad—run sibly by an application Setup program that changes data stored in CMOS. Memory not operating Faulty or improperly System RAM correctly.

  • Page 37: Running The Dell Diagnostics

    To start the diagnostics, turn off the computer, insert a diagnostics diskette into the diskette drive, and then turn on the computer. Starting the diagnostics causes the Dell logo screen to appear, followed by a message indicating that the diagnostics is loading. Before the diagnostics loads, a program tests the portion of main memory (RAM) required for loading the diagnostics.

  • Page 38: Removing And Replacing Parts

    Chapter 4 Removing and Replacing Parts his chapter provides procedures for removing and replacing components, assemblies, and subassemblies. Unless otherwise noted, each of the procedures in this chapter assumes the following: • The computer and any attached peripherals are turned off and the peripher- als disconnected from the computer’s I/O panel.

  • Page 39: Screw Identification And Tightening

    Where applicable, information about screw lengths is provided in illustrations. Before installing a screw, match the screw to the screw length graphics provided to check for correct length. Dell Latitude LM Systems Service Manual...

  • Page 40: Precautionary Measures

    recautionary Measures Before performing any of the procedures in this chapter, read the following warning. WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT: Before you start to work on the computer, per- form the following steps in the sequence indicated. 1.

  • Page 41: Figure 4-4. Hard-Disk Drive Removal

    Turn the computer over and push the lock towards the options bay. Slide the latch toward the back of the computer (the latch does not move all the way to the lock groove). device back of the computer lock latch Figure 4-5. Options Bay Lock and Latch Dell Latitude LM Systems Service Manual...

  • Page 42: Figure 4-6. Diskette Drive, Secondary Battery, Or Cd-Rom Removal

    Keep holding the latch with one hand while pulling the device (diskette drive, secondary battery, or CD-ROM) straight out of the options bay with the other. Figure 4-6. Diskette Drive, Secondary Battery, or CD-ROM Removal 7. Remove any PC Cards To remove a PC Card from the top connector, press the top eject button (identified by an arrow pointing up).

  • Page 43: Zif Connectors

    2. Orient the end of the interface cable with the ZIF connector, and insert the end of the cable into the connector. 3. While holding the cable in place, close the ZIF connector. To ensure a firm connection, make sure the ZIF connector is completely closed. Dell Latitude LM Systems Service Manual...

  • Page 44: Exploded Views Of Components And Assemblies

    xploded Views of Components and Assemblies LCD panel assembly latch (2) keyboard power/ suspend indicator heat sink bottom assembly diskette drive, secondary battery, or CD-ROM hard-disk drive main battery Figure 4-9. Exploded View—Computer Removing and Replacing Parts...

  • Page 45: Figure 4-10. Exploded View-Lcd Assembly

    LCD panel LCD panel flex cable latch power/suspend indicator hinge (2) inverter board back bezel inverter board connector stiffener microphone Figure 4-10. Exploded View—LCD Assembly Dell Latitude LM Systems Service Manual...

  • Page 46: Figure 4-11. Exploded View-Top Assembly

    keyboard flex cable keyboard keyboard screw heat sink cover (2) hinge cover LCD flex- cable cover touch pad button (2) power button spring assembly touch pad infrared lens touch pad bracket infrared board touch-pad button board speaker (2) panel board cable plastic housing (2) status-display...

  • Page 47: Figure 4-12. Exploded View-Bottom Assembly

    I/O panel door main board cache board I/O bracket bottom assembly memory module cover Figure 4-12. Exploded View—Bottom Assembly 4-10 Dell Latitude LM Systems Service Manual...

  • Page 48: Factory Repair Parts And Assemblies

    This section contains a parts list and procedures for removing and replacing fac- tory components and subassemblies. This information is provided for reference only. Dell does not recommend removal and replacement of these parts in the field. Table 4-1 lists the factory repair parts and assemblies available for the com- puter.
  • Page 49 CUS,CD ROM,4X,LMP,SANYO CD-ROM drive CD ROM,4X,LMP,SANYO Diskette Drive Assembly Diskette drive assembly CUST,FD,INT/EXT,LMP Diskette drive, internal/external FD,INT/EXT,LMP Case, upper PLSTC,UPR,FD,LMP Case, lower PLSTC,LWR,FD,LMP Cable, service kit CUST,CBL,FD,INT/EXT,LMP Connector, cable CBL,FD,INT/EXT,LMP * Customer-replaceable unit (CRU) 4-12 Dell Latitude LM Systems Service Manual...
  • Page 50 Table 4-1. Factory Repair Parts and Assemblies (Continued) Part or Assembly Name Order Name Hard-Disk Drive Assemblies Hard-disk drive, 540-MB, service CUS,HD,540MB,I,F2,12.5MM,NBK kit* Hard-disk drive, subassembly, SUBASSY,HD,540MB,LF2, 540-MB 12.5MM,NBK Hard-disk drive, 540-MB HD,540MB,I,F2,12.5MM,NBK Bracket, hard-disk drive BRKT,HD,12.5MM,LMP Screws, bracket SCR,3X.5X3,FLH,PNH,MS,ZPS,HD Hard-disk drive, 810-MB, service CUS,HD,810MB,12.5MM,NN,#1, kit*...
  • Page 51 Memory module, 32-MB, service CUS,MEM,32M,LMP Memory module, two 16-MB DIMM,16MB,LXP Miscellaneous Parts Cover, front, hard-disk drive BZL,HDD,LMP Cover, hinge/infrared lens, right CVR,PLSTC,IR,LMP Cover, hinge, left CVR,HNG,LF,LMP Cover, keyboard screws CVR,SCR,KYBD,LMP * Customer-replaceable unit (CRU) 4-14 Dell Latitude LM Systems Service Manual...
  • Page 52 Table 4-1. Factory Repair Parts and Assemblies (Continued) Part or Assembly Name Order Name Miscellaneous Parts (Continued) Cover, flex-cable CVR,HNG,CTR,LMP Insulator, expansion connector INSUL,CON,DCKG,LMP Insulator, main board INSUL,MYLAR,I/O,LMP Bracket, I/O BRKT,I/O,LMP Door, I/O DOOR,I/O,LMP Door, memory module DOOR,RAM,LMP Guide, hard-disk drive, left GDE,RL,LF,HD,LMP Assembly, base CVR,BTM,PLSTC,SYS,BAS,LMP...
  • Page 53 BTN,TPAD,LF,LMP Spring, touch pad or power button SPR,PWR,KNOB,LMP Button, power BTN,PWR,LMP Touch Pad Touch pad assembly ASSY,TPAD,LMP Cable, touch pad CBL,FLEX,TPAD,LMP Card, touch-pad switch SWT,CRD,TPAD,LMP Card, touch pad CRD,TPAD,LMP Insulator, touch pad INSUL,MYLAR,TPAD,LMP 4-16 Dell Latitude LM Systems Service Manual...

  • Page 54: Table 4-2. Naming Conventions

    Table 4-2. Naming Conventions Name in This Manual Name in Other Documents Main board Mother board assembly Processor board CPU daughter board Heat sink Daughter card heat-sink assembly Inverter board Invertor PWA Front bezel LCD bezel Flex-cable cover Top cover Back bezel LCD back plastics Bottom or base assembly...

  • Page 55: Deleting The Password

    1. Open the computer and remove the keyboard. See “Keyboard” found later in this chapter. 2. Place a short across the terminals of capacitor C146. 3. Allow time for the CMOS battery to recharge. 4-18 Dell Latitude LM Systems Service Manual...

  • Page 56: Hard-Disk Drive

    ard-Disk Drive hard-disk drive carrier flex-cable connector (screws E1–E6 are 4 mm) 4 mm Figure 4-14. Hard-Disk Drive Disassembly The hard-disk drive resides in a carrier that mounts in the computer’s hard-disk drive compartment on the front of the computer. Four screws secure the drive inside the carrier.

  • Page 57: Diskette Drive

    The diskette drive resides in a carrier that slides into the options drive bay on the right side of the computer. The diskette drive and carrier are replaced as a unit and are not disassembled. 4-20 Dell Latitude LM Systems Service Manual...

  • Page 58: Cd-Rom

    D-ROM CD-ROM and carrier Figure 4-16. CD-ROM Assembly The CD-ROM resides in a carrier that slides into the options drive bay on the right side of the computer. The CD-ROM and carrier are replaced as a unit and are not disassembled. Removing and Replacing Parts 4-21...

  • Page 59: Memory Module

    The following combinations are possible: • 16 MB — Install two 4-MB memory modules. • 24 MB — Install two 8-MB memory modules. • 40 MB — Install two 16-MB memory modules. 4-22 Dell Latitude LM Systems Service Manual...

  • Page 60: Lcd Assembly

    CD Assembly The LCD assembly consists of the display assembly and its related components. The subsections that follow provide removal and replacement procedures for the components of the LCD assembly. LCD assembly hinge covers (2) (screws H1–H4 are 5 mm) flex-cable cover 5 mm Figure 4-18.

  • Page 61: Front Bezel

    When replacing the front bezel, orient the bezel in its original position on the assembly and press firmly near each tab until the bezel snaps into place. 4-24 Dell Latitude LM Systems Service Manual...

  • Page 62: Lcd Panel

    LCD Panel There are two types of LCD panels: the dual-scan color display (STN) and the active-matrix color display (TFT). The removal process for both LCD panels is the same. LCD panel LCD flex cable power/ suspend indicator (screws H11–H14 upper are 6 mm) connector...

  • Page 63: Inverter Board

    3. Disconnect the power/suspend indicator connector. 4. Remove inverter board screws H15 and H16. 5. Remove the inverter board from the back bezel. Microphone The microphone cannot be removed separately; it is part of the inverter board. 4-26 Dell Latitude LM Systems Service Manual...

  • Page 64: Lcd Assembly Latches

    LCD Assembly Latches spring (2) latch (2) back bezel Figure 4-22. LCD Assembly Latches Removal To remove the LCD assembly latches, follow these steps: 1. Remove the front bezel. See “Front Bezel” found earlier in this section. 2. Place the back bezel down on a work surface. 3.

  • Page 65: Power/Suspend Indicator

    See “LCD Panel” found earlier in this section. 3. Remove the power/suspend indicator. Disconnect the power status connector from the inverter board. Lift the indi- cator out of the recess in the top of the back bezel. 4-28 Dell Latitude LM Systems Service Manual...

  • Page 66: Back Bezel

    Back Bezel back bezel Figure 4-24. Back Bezel Removal To remove the back bezel, follow these steps: 1. Remove the front bezel. See “Front Bezel” found earlier in this section. 2. Remove the LCD panel. See “LCD Panel” found earlier in this section. NOTE: Be careful when removing any part of the LCD flex cable.

  • Page 67: Keyboard

    1. Open the computer. 2. Remove the keyboard screw covers. 3. Remove keyboard screws S1 and S2. Lay the keyboard back against the LCD assembly or a prop to avoid detach- ing the keyboard cable. 4-30 Dell Latitude LM Systems Service Manual...
  • Page 68 4. Remove heat sink screws S3 and S4. Lift off the heat sink. CAUTION: Lift away the heat sink gently. Rough handling could damage the thermal pad on the bottom of the heat sink. 5. Disconnect the keyboard cable from the main board. Use a small flat-blade screwdriver to release the ZIF connector securing the keyboard cable.

  • Page 69: Top Assembly

    (screws SD1 and SD2 are 5 mm) hook main board 5 mm (screws SD3 and SD4 are 3 mm) 3 mm bottom assembly Figure 4-26. Top Assembly Removal 4-32 Dell Latitude LM Systems Service Manual...
  • Page 70 To remove the top assembly, follow these steps: 1. Remove the LCD panel. See “LCD Panel” found earlier in this chapter. 2. Remove the keyboard. See the previous section, “Keyboard.” 3. Remove side screws SD1 and SD2. 4. Disconnect the touch pad connector. Use a small flat-blade screwdriver to release the connector from the main board.

  • Page 71: Speakers

    3. Disconnect the speaker connectors from both ends of the status display board. 4. Remove the pieces of plastic tape holding the connector wires to the top assembly. 5. Remove the speakers from the top assembly. 4-34 Dell Latitude LM Systems Service Manual...

  • Page 72: Status Display Board

    Status Display Board top assembly infrared device connector speaker connector (2) status- (screws S7–S9 display are 6 mm) board connector status display board 6 mm Figure 4-28. Status Display Board Removal To remove the status display board, follow these steps: 1.

  • Page 73: I/R Device

    3. Dislodge the I/R device from the recess on the top assembly. Thread the I/R connector and wires through the opening on the top assembly. 4. Remove the I/R device from the top assembly. 4-36 Dell Latitude LM Systems Service Manual...

  • Page 74: Power Button

    Power Button power button spring Figure 4-30. Power Button Removal To remove the power button, follow these steps: 1. Remove the top assembly. See “Top Assembly” found earlier in this section. 2. Remove the status display board. See “Status Display Board” found earlier in this section. 3.

  • Page 75: Touch Pad

    4. Remove touch-pad bracket screws S14 and S15. Remove the touch pad bracket. 5. Remove the touch pad bracket and touch pad from the top assembly. 4-38 Dell Latitude LM Systems Service Manual...

  • Page 76: Bottom Assembly

    ottom Assembly This bottom assembly consists of a plastic base, the main board, and the main board components. The subsections that follow provide removal and replace- ment procedures for the components of the bottom assembly. processor board power supply board audio board main board cache board...

  • Page 77: Processor Board

    3. Remove the processor board from the main board. The processor board is held in place on the main board by two connectors. Use a chip removal tool to remove the processor board. 4-40 Dell Latitude LM Systems Service Manual...

  • Page 78: Power Supply Board

    Power Supply Board power supply board main board Figure 4-34. Power Supply Board Removal To remove the power supply board, follow these steps: 1. Open the cover. 2. Remove the top assembly. See “Top Assembly” found earlier in this chapter. 3.

  • Page 79: Audio Board

    On the other side of the main board, the audio board is held in place by a clasp and two projections. The clasp and projections are on a plastic holder. Lift out the plastic holder. 4-42 Dell Latitude LM Systems Service Manual...

  • Page 80: Main Board

    Main Board I/O panel cover I/O panel bracket main board (screws ST1–ST6 (screw ST9 (screw S18 are 6.5 mm) is 8 mm) is 4 mm) 6 mm 6.5 mm 4 mm (screws S19– (screws S16 and (screws ST7 and S20 are 5 mm) S17 are 4 mm) ST8 are 4.5 mm) 4.5 mm...
  • Page 81 When reinstalling the main board, bend the wall back to the vertical position. 10. Remove the main board. Lift the end of the board nearest the front of the computer, and pull the board up and out of the computer. 4-44 Dell Latitude LM Systems Service Manual...

  • Page 82: Cache Board

    Cache Board main board audio board cache board Figure 4-37. Cache Board Removal To remove the cache board, follow these steps: 1. Open the cover. 2. Remove the main board. See the previous subsection, “Main Board.” 3. Turn the main board over. 4.
  • Page 83 4-46 Dell Latitude LM Systems Service Manual...

  • Page 84: Index

    , 1-6 battery main, removal , 4-3 optional, removal , 4-4 Battery Activity indicator , 1-4 battery charge gauge Dell diagnostics , 1-5 , 3-6 Battery Status indicator dimming the display , 1-4 , 1-6 beep codes diskette drive bay...
  • Page 85 eliminating resource conflicts I/O panel , 2-5 , 1-2 error messages infrared device removal , 3-3, 3-6 , 4-36 infrared port , 4-3 , 1-2 expansion connector initial procedures , 1-2 beep codes , 3-1 exploded view system error messages , 3-3 bottom assembly , 4-10...
  • Page 86 POST beep codes about , 3-1 list of , 3-2 main battery location , 4-3 power removal , 4-3 computer , 1-6 main-battery compartment , 1-2 power button location , 1-2 memory removal , 4-37 maximum configuration , 1-1 system memory , 1-1 power conservation , 1-6...
  • Page 87 , 2-1 about , 1-3 initial user contact , 2-1 location , 1-2 POST beep codes , 3-1 running the Dell diagnostics subsystems , 3-6 system error messages , 3-3 testing , 3-6 visual inspection , 2-1 suspend mode...

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