Dell Latitude LT System Parts list manual

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____________________
Information in this manual is subject to change without notice.
© 1998 Dell Computer Corporation. All rights reserved.
Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarks used in this text:
Dell , the DELL logo, and Latitude are trademarks of Dell Computer 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.
December 1998 P/N 8829D

DISASSEMBLY AND REASSEMBLY
1.Here is the procedure for disassembling the Latitude LT computer. The product should be reassembled in the reverse order from disassembly.
2.The description of some components that can be disassembled and reassembled relatively easily may be omitted.
3.Before trying to disassemble the product, make sure of the wiring and the positions of the tapes and Mylars attached.
1. Keyboard, LCD unit
a.Remove the keyboard unit 3, upper cabinet 4, and LCD unit
Hfrom the lower cabinet I, following the flow chart.
Parts List
No. Part Name Q’ty
1Screw (M2 ×5) 8
2Screw (M2 ×8) 2
3Keyboard unit 1
4Upper cabinet 1
5Mike unit 1
6Screw (M2 ×6) 1
7Indicator cover 1
8Indicator cable 1
9LCD cable 1
10 Screw (M2 ×5) 4
11 Screw (M2 ×4) 2
12 LCD unit 1
13 Lower cabinet 1
[Cautions for reassembling]
1.The indicator cable 8should be wired by pushing it in the direc-
tion indicated by the arrow.
2.After attaching indicator cover 7, check that the pawl on the rear
side is securely engaged.
3.When installing the keyboard unit 3, align the projection of the
unit (item A) with the recess in the upper cabinet (item B).
12
11
8
94
A
A
6
7
A
B10 10
B
5
10
1
2
13
1
3
B
B
A
AA
2
1
1
11
8
Indicator cable
2
3
4
5
1
6
8
9
10
11
12
13
7
Dell Latitude LT Systems Parts Removal and Replacement Guide 1

2. Inverter PWB, LCD unit
a.Remove the LCD unit from the lower cabinet, following the proce-
dure 1-a.
b.Remove the LCD panel 4, inverter PWB F, and LCD unit G,
following the flow chart.
Parts List
No. Part Name Q’ty
1Screw-covering sheet 4
2Screw (M2 ×2.8) 2
3Screw (M2 ×6) 2
4LCD panel (display front
cabinet) 1
5Screw (M2 ×6) 4
6Hinge R 1
7Hinge L 1
8Main cable 1
9Inverter cable 1
10 Inverter PWB 1
11 LCD unit 1
12 LCD cover assembly 1
[Cautions for reassembling]
1.The LCD unit should be wired as follows:
1)After attaching the vinyl tapes, attach four copper foil tapes in
the order of A to D.
2)Make sure to attach the copper foil tape A to the screw A.
3)Make sure to attach the copper foil tape C to both the screw B
and backlight chassis.
4)Use caution not to block the holes A and B when attaching
vinyl tapes A and B.
5)Make sure to pass the main cable between the capacitor and
the resistor.
6)The main cable should be passed to the left side of the rib A
and the inverter cable to the right side of the rib B.
2.Attach the insulating sheet and inverter spacer to the inverter
PWB, using the following cautions:
3.Use caution not to get the high-voltage cable caught when tight-
ening the screw for the hinge L 7.
4.When setting the LCD panel 4onto the LCD cover assembly,
first fit the A and B of the 10 hooks indicated by dotted lines on
the LCD panel 4. Use caution not to get the inverter insulating
sheet caught.
A
B
1
3
4
1
3
1
2
1
2
5
6
9
10
11
7
8
12
Vinyl tape
Copper foil tape
Insulating sheet
Vinyl tape
Copper foil
tape
Vinyl tape
LCD unit
Copper foil
tape B
Reference X
Vinyl tape
Reference b
Reference Y
Reference a
Screw A
Reference Z Copper foil tape A
Rib A
Resistor
Capacitor
Reference eReference b
Hole B
Reference dVinyl tape B
Inverter cable
Main cable
Copper foil
tape D
Copper foil
tape C
Vinyl tape
Reference C
Hole A
Reference W
Screw B
Reference U
Rib B
Reference V Backlight chassis
CN2
CN2
CN1
Inverter spacer
Attach
Corner
Put it over and attach with
double-coated tape. Align the
edges.
Corner
Attach
Corner Insulating
sheetReference 1
Reference 2
Inverter PWB Corner
Attach with
double-coated tape
Attach inverter spacer,
aligning with the left
edge of connector CN2
(reference 1) and
reference 2.
CN2
Corner
Make sure to align the edges of the inverter PWB
with those of insulating sheet before attaching the
double-coated tape on the insulating sheet to the
back side of the inverter PWB (when CN2 is not
used).
3
Inverter PWB
Section A Cable
(high-voltage
cable)
Use caution not to get the inverter high-voltage
cable caught in the section A of the hinge L.
1
2
3
4
6
7
8
9
10
511
12
2 Dell Latitude LT Systems Parts Removal and Replacement Guide

3. Lower cabinet, built-in battery
replacement
a.Remove the keyboard, upper cabinet, and LCD unit from the
lower cabinet, following the procedure 1-a.
b.Remove the built-in battery, HDD unit assembly, and glide point
PWB, following the flow chart.
[Note] When replacement of
built-in battery is required,
follow the steps 1to 9
of the flow chart.
Parts List
No. Part Name Q’ty
1IR filter 1
2D-sub connector cover 1
3Power supply switch button 1
4IO connector cover 1
5Screw (M2 ×8) 3
6Heat dissipation plate
assembly 1
7Glide point pad assembly 1
8Glide point button 1
9Built-in battery assembly 1
12 Screw (M2 ×4) 1
13 HDD FPC 1
14 HDD unit assembly 1
15 Shut switch cable 1
16 Mike cable 1
17 Glide point FPC (fine) 1
18 Glide point FPC (thick) 1
19 Glide point PWB 1
20 Screw 4
21 HDD unit 1
[Cautions for reassembling]
1.Attach the glide point-covering sheet to the glide point PWB O,
using the following references:
2.Connect shut switch cable Kto connector CN23 of the main
PWB before installing HDD unit assembly J. Insert shut switch cable
Kconnector in the direction shown below.
3.Connect the shut switch cable Kto the main PWB CN23 before
installing the HDD unit J.
4.Connect the HDD FPC I to the rightmost pin of the HDD.
5.The shut switch cable Kand mike cable Lshould be wired as
shown below.
6.Connect glide point FFC (large) to glide point pad assembly 7.
Install glide point pad assembly 7to HDD chassis.
7.Install power supply switch button 3as shown below.
1
5
6
7
8
19
9
17
18
12
14
15
13
3
4
16
2
20
12
20
20
21
20
Glide point-covering sheet
Glide point PWB
Reference
Reference
CN24
CN23
White(Cable color)
Black(Cable color)
15
Empty pin
(4 pcs)
HDD PWB
surface Rightmost
pin
HDD FPC
Chassis
switch
cable
Pass under the HDD chassis.
Pass between
U21 and CN9. Mike
Mike cable
Pass
between
X4 and
U25.
Fix with
tape
M/B surface
Fix with tape
Insert into CN11
and pass rightward
Pass through the left side of U28.
Use caution
not to let the
cable run
under the
chassis hole.
U21
U25
X4
U33
U28
CN11
CN9
(LCB CONNECTOR)
3
As shown in the figure on
the left, the [:::] section of
the power switch button
cover should be located
at the right side.
Make sure the button is inserted in parallel to the cabinet.
(Otherwise, the rib might be broken leading to poor sliding
of the button.)
Right
Left
1
2
3
4
6
20
21
12
13
5
14
15
7
9
8
16
17
18
19
Dell Latitude LT Systems Parts Removal and Replacement Guide 3

4. Lower cabinet
a.Remove the keyboard, upper cabinet, and LCD unit from the
lower cabinet following the procedure 1-a.
b.Remove the built-in battery, HDD unit and others, following the
procedure 3-b.
c.Remove the lithium battery, speaker, IR-PS PWB and main
PWB, following the flow chart.
Parts List
No. Part Name Q’ty
1Lithium battery 1
2Speaker 1
3FFC (for IR-PS PWB) 1
4IR-PS PWB 1
5Expansion battery
connector cover 1
6Screw (M2 ×2.8) 2
7Screw (Ms ×4) 6
8Main PWB assembly 1
9LED PWB 1
10 LED FFC 1
11 Reset label 1
12 Rubber leg (oval) 4
13 Rubber leg (circle) 1
14 Lower cabinet assembly 1
[Cautions for reassembly]
1.Attach IR-PS PWB insulating sheet as shown in the figure below.
2.When setting main PWB assembly 8to the lower cabinet, insert
the knob and audio jack first.
3.Secure the main PWB assembly 8with 6 screws. The screws
should be tightened in the order of A to C. Use caution not to
damage LED FFC.
A
BC
7
6
9
7
7
8
10
12
12
12 5
3
21
13
4
11
10
12
14
Attach IR-PS PWB insulating
sheet, using rib A as a
reference.
Rib A
Insulating
sheet
1
2
3
4
6
7
8
9
10
5
11
12
13
14
4 Dell Latitude LT Systems Parts Removal and Replacement Guide

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