Dell Latitude LM User manual

Dell Latitude LM Service Manual Update 1

Dell

Latitude

Service Manual Update

his document updates information contained in the Dell Latitude LM Service

Manual.

ew S

stem Features

Additional system features include:

•Now available with a 166-MHz Intel®Pentium® microprocessor with

MMX™technology in the Dell Latitude LM M166ST, which has the same

features as other models of the computer.

•Support for a maximum of 72 MB of system memory by installing a

matched pair of 32-MB memory modules in the memory upgrade sockets on

the main board. (The standard minimum configuration is now 8 MB of non-

removable memory on the main board and two 4-MB memory modules in

the memory upgrade sockets.)

•The Pentium microprocessor with MMX technology has twice the internal

cache memory (32 KB) as the standard Pentium microprocessor.

•A NeoMagic 2093 video controller for a video subsystem that includes

1.1 MB of video memory.

•6X or 10X CD-ROM drives.

•Your computer may not appear exactly as shown in some of the figures in

the Service Manual. Conductive sponges or EMI shields may have been

added.

2 Dell Latitude LM Service Manual Update

echnical Specifications

The following information updates Table A-1, “Technical Specifications,” in

Appendix A.

Technical Specifications

Microprocessor

Microprocessor type/speed. . . Pentium microprocessor with MMX tech-

nology/166 MHz or Pentium microprocessor/

133 MHz

Internal cache . . . . . . . . . . . . . 32 KB (Pentium microprocessor with MMX

technology) or 16 KB (133-MHz Pentium

microprocessor)

External cache . . . . . . . . . . . . 256-KB write-back SRAM

Math coprocessor . . . . . . . . . . internal to the microprocessor

Memory

Architecture . . . . . . . . . . . . . . fast-page mode, two-way interleaved

Memory module

capacities . . . . . . . . . . . . . . . . 4, 8, 16, and 32 MB; memory modules must be

installed in matched pairs (two 4-MB modules,

two 8-MB modules, two 16-MB modules, or

two 32-MB modules)

Standard RAM . . . . . . . . . . . . 16 MB (8 MB of nonremovable memory on the

system board and two installed 4-MB memory

modules)

Maximum RAM. . . . . . . . . . . 72 MB

Memory access time:

tRAC . . . . . . . . . . . . . . . . 70 ns

tCAC . . . . . . . . . . . . . . . . 20 ns

BIOS address . . . . . . . . . . . . . F000:0000

Dell Latitude LM Service Manual Update 3

Video

Video type. . . . . . . . . . . . . . . . 64-bit (128-bit hardware accelerated) PCI

Video controller . . . . . . . . . . . NeoMagic 2093 (systems with MMX technol-

ogy) or NeoMagic 2070

Video memory. . . . . . . . . . . . . 1.1 MB (systems with MMX technology) or

896 KB

Battery

Type. . . . . . . . . . . . . . . . . . . . . lithium ion

Dimensions:

Height . . . . . . . . . . . . . . . . 22.0 mm (0.86 inch)

Depth. . . . . . . . . . . . . . . . . 219.0 mm (8.62 inches)

Width. . . . . . . . . . . . . . . . . 57.8 mm (2.27 inches)

Weight. . . . . . . . . . . . . . . . . . . 0.44 kg (0.97 lb)

Voltage . . . . . . . . . . . . . . . . . . 10.8 VDC

Capacity . . . . . . . . . . . . . . . . . 42 WH

Charge time (approximate):*

Computer on . . . . . . . . . . . 4 hours

Computer off. . . . . . . . . . . 3 hours

Operating time (approximate,

with no power management

features enabled)*. . . . . . . . . . 3 to 5 hours with one battery;

6 to 10 hours with two batteries

Life span (approximate)*. . . . . 500 discharge/charge cycles

Temperature range:

Charge and discharge . . . . 5° to 35°C (41°to 95°F)

Storage . . . . . . . . . . . . . . . -20° to 50°C (-4°to 122°F)

CD-ROM Drive

Form factor . . . . . . . . . . . . . . . 5.25 inches

Interface . . . . . . . . . . . . . . . . . IDE

Memory. . . . . . . . . . . . . . . . . . 128,000 bytes (data buffer memory)

* 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.

Technical Specifications (continued)

4 Dell Latitude LM Service Manual Update

dditional Parts and Assemblies

Removal and replacement procedures for all parts and assemblies are the same as

those described in Chapter 4, “Removing and Replacing Parts.” However, some

of the parts and assemblies used are different. The following information updates

Table 4-1, “Factory Repair Parts and Assemblies,” in Chapter 4.

CD-ROM Drive

(continued)

Voltage . . . . . . . . . . . . . . . . . . 5 V (single-voltage drive)

Access time. . . . . . . . . . . . . . . 250 m/sec

Data transfer rate:

Sequential. . . . . . . . . . . . . 150 KB/sec

900 KB/sec (6X)

1500 KB/sec (10X)

From buffer. . . . . . . . . . . . 14.4 MB/sec

Physical:

Height. . . . . . . . . . . . . . . . 17.0 mm (0.67 inch)

Width . . . . . . . . . . . . . . . . 130.6 mm (5.14 inches)

Depth . . . . . . . . . . . . . . . . 140.6 mm (5.56 inches)

Weight (no CD in tray). . . 0.35 kg (0.77 lb)

Factory Repair Parts and Assemblies

Part or Assembly Number Order Number

Board Assemblies

Board assembly, 166-MHz, service kit SVC,SYS,PLN,LMP166ST

Main board SYS,PLN,TFT,LMM

Processor board, 166-MHz CRD,PRCR,LMP166

Card, cache CRD,L2,CACHE,LMP

Heat sink, microprocessor,

subassembly SUBASSY,HTSNK,CPU,LMM

Screws, heat sink SCR,2X,4X4,PHH,MS,ZPS

Spacer/Bumper, rubber, flex cable BMPR,LCD,FPC,25X5X5M,LMP

Technical Specifications (continued)

Dell Latitude LM Service Manual Update 5

Board Assemblies

(continued)

Foil, metal EMI SHLD,EMI,AL,W/CNDCT

ADH,LMM

Insulator, power supply INSUL,MYLAR,BD,CONV,

DC-DC.LMP

Board, power supply CRD,CONV,DC-DC,LMM

Insulator, main board INSUL,MYLAR,BD,CONV,

DC-DC,LMP

Boards and Cards

Cable, flex, audio jack CBL,FLEX,JK,AUD,W/EMI,LM

CD-ROM

CD-ROM, service kit*CUS,CD ROM,6X,LMP

CD-ROM drive CD ROM,6X,LMP

CD-ROM, service kit*CUS,CD ROM,I,INT,10X,LMP

CD-ROM drive CD ROM,I,INT,10X,LM

Hard-Disk Drive Assemblies

Hard-disk drive, 2.1-GB, service kit*CUS,HD,2.1GB,I,F2,12.5MM

Hard-disk drive, 2.1-GB,

subassembly SUBASSY,HD,2.1G,F2,

12.5MM,NBK

Hard-disk drive, 2.1-GB HD,2.1GB,I,F2,12.5MM,IBM

Bracket, hard-disk drive BRKT,HD,12.5MM,LMP

Screws, bracket SCR,M3,0x0,5,PHH,NPL

LCD Assembly

LCD, IBM, service kit SVC,LCD/FPC/INV,TFT,LMM,IBM

Cable, TFT flex CBL,FLEX,LCD,TFT,IBM,W/

EMI,LM

LCD, SA, service kit SVC,LCD/FPC/INV,TFT,LMM,

SMSNG

LCD panel, active-matrix color

display (TFT), 12.1” LCD,TFT,SVGA,12.1”,LM,SMSNG

* Customer-replaceable unit (CRU)

Factory Repair Parts and Assemblies (continued)

Part or Assembly Number Order Number

6 Dell Latitude LM Service Manual Update

LCD Assembly

(continued)

Board, TFT inverter CRD,INVRTR,TFT,SMSNG,LM

Cable, TFT flex CBL,FLEX,LCD,TFT,SMSNG,LM

Bezel, TFT back CVR,BK,LCD,TFT,SMSNG,LM

LCD, LG, service kit SVC,LCD/FPC/INV,TFT,LMM,LG

LCD panel, active-matrix color

display (TFT), 12.1” LCD,TFT,SVGA,12.1”,LMP,LG

Board, TFT inverter CRD,INVRTR,TFT,LMP,LG

Cable, TFT flex CBL,FLEX,LCD,TFT,LG,

W/EMI,LM

Bezel, TFT back CVR,BK,LCD,TFT,LMP,LG

Memory

Memory module, 64-MB SODIMM,

service kit*CUS,MEM,64M,LMP

Memory module, two 32-MB DIMM,32MB,70NS,8X32,NBK,G

Miscellaneous Parts

Top cover, palmrest PLMRST,PLSTC,BLK,W/EMI,LM

Top Case Assembly

Guide rail, hard-disk drive, left RAIL,HD,LF,W/EMI PLD,LM

Guide rail, hard-disk drive, right GDE, RL,RT,HD,LMP

Case, base bottom CVR,BTM,PLSTC,BLK,

W/EMI,LM

* Customer-replaceable unit (CRU)

Factory Repair Parts and Assemblies (continued)

Part or Assembly Number Order Number

Dell Latitude LM Service Manual Update 7

MI Chan

The following EMI changes may have been made to your computer, and the

sections in Chapter 4 should be updated to reflect these changes.

Keyboard

The heat sink in your computer may be slightly different from the one shown in

Figure 4-25. There may be a conductive sponge added to your computer.

Top Assembly

If you have a Latitude MMX computer, use the following figure for the removal

and replacement procedure. The top assembly has two hard-disk drive contact

springs on the underside of the top assembly. There is also a conductive sponge

added to the top assembly (see the following figure).

Top Assembly Removal

hinge cover (2)

keyboard

touch pad

connector

main board

top assembly

bottom

assembly

(screws SD1 and

SD2 are 5 mm)

SD3

5 mm

SD4 hook

display close

button

SD1

SD2

(screws SD3 and

SD4 are 3 mm)

3 mm

kapton tape

EMI foil

heat sink

conductive sponge

8 Dell Latitude LM Service Manual Update

When you separate the top assembly from the bottom assembly, peal the kapton

tape from the EMI foil.

Before replacing the top assembly, replace the old EMI foil with a new EMI foil

and replace the old kapton tape with a new piece of kapton tape.

Bottom Assembly

The bottom assembly in your computer may have an I/O EMI shield and con-

ductive sponges in addition to the components shown in Figure 4-32.

Audio Board

The audio cable may be wrapped in EMI cloth.

hecking the Label

After replacing the old display, make sure the computer’s display label on the

back of the computer reflects the correct display in the computer by following

these steps:

1. Open the computer’s I/O panel door.

2. Check the label below the service tag (as you look at the back of the

computer).

If the label has the correct code for the display in the computer, no further

action is required.

If you replaced the display that was in the computer with a different display

(for instance, an IB display was replaced with an LG display), cross out the

preprinted code and write the code for the replacement display in the blank

space on the label.

If the computer does not have a display type label, place the blank label

(that came in the service kit) below the service tag and write in the code for

the display—for instance, IB, SA, or LG.

ain Board Switch

The following information supplements step 10 of the “Main Board” procedure

in Chapter 4:

•If you reinstall the main board with a Revision 5a main board, make sure the

DIP switch, SW2 (see the following figure), is set correctly for the type of

display, STN or TFT, in your computer.

•For an STN display, switches 1 and 4 are on and switches 2 and 3 are off.

•For a TFT display, switches 1 and 4 are off and switches 2 and 3 are on.

Dell Latitude LM Service Manual Update 9

Main Board Switches

If you are replacing the main board in a Latitude LM M166ST or in a Latitude

LM P133ST with the EMI cloth tape on the audio cable (system board #82224),

use the following procedure to adjust the EMI cloth-covered audio cable:

1. Remove the main board from the shipping container.

2. Remove the foam pad by sliding it out from under the audio cable.

3. Install the main board in the computer.

main

board

SW2

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