Dell Latitude LM User manual

Dell Latitude LM Service Manual Update 1
Dell
®
Latitude
®
LM
Service Manual Update
T
his document updates information contained in the Dell Latitude LM Service
Manual.
N
ew S
y
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
T
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
A
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
E
MI Chan
g
es
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.
C
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.
M
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