dell latitude ls portable computers User Manual

							support.dell.com Dell Latitude LS Portable Computers Service Manual 23
8. Disconnect the flex cable from the ZIF connector on the back of the touch 
pad (see Figure 16).
The flex cable remains attached to the touch pad holder assembly.
Bottom Assembly
Figure 17.  Bottom Assembly   
 
The bottom assembly consists of the following field-replaceable components:
Reserve battery
RTC battery
Main battery
Modem
Fan assembly
Speaker
System board assembly
Main battery release latch
Bottom case assembly
reser ve 
batter y
fan
main battery 
compartment
system board 
assembly
bottom 
case covermain battery release 
latch location
RTC batter y
modemspeaker (shown with audio 
EMI shield removed) 
						

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Reserve Battery    
Figure 18.  Reserve Battery Removal
NOTICE: The reserve battery provides power to the computer’s     
nonvolatile random-access memory (NVRAM) when the computer is 
turned off. Removing the battery causes the computer to lose the  
user-settable parameters in NVRAM. If possible, make a copy of this 
information before you remove the reserve battery.
1. Remove the keyboard bezel.
2. Remove the keyboard assembly.
3. Peel the reserve battery away from the foam pad on the system board   
(see Figure 18).
The reserve battery is located between the memory module and the PC 
card bay, and is attached to the system board with an adhesive foam pad.
4. Disconnect the reserve battery cable from the connector on the system 
board.
5. Remove the remnants of the foam pad from the system board.
RTC Battery
NOTICE: Removing the real time clock (RTC) battery causes the 
computer to lose its date and time settings, which are used to identify 
when files are created or modified. You must enter the date and time 
settings after you replace the RTC battery.
1. Remove the keyboard bezel.
2. Remove the keyboard assembly.
reser ve batter y cable reserve battery 
						

							support.dell.com Dell Latitude LS Portable Computers Service Manual 25
3. Grasp the RTC battery and pull it out of the holder.
You may need to used a small flat-blade screwdriver to carefully pry the 
battery out of the holder.
Main Battery
See the “Preparing to Work Inside Your Computer” section found earlier in this 
manual for detailed instructions for removing the battery.
Modem
Figure 19.  Modem Removal
1. Remove the keyboard bezel.
2. Remove the display assembly.
3. Remove the keyboard assembly.
4. Remove the palmrest assembly.
5. Use a 5-mm socket wrench to remove the four 5-mm socket screws for the 
VGA and parallel ports located on the back of the bottom assembly.
6. Use a small flat-blade screwdriver to remove the two integrated drive 
electronics (IDE) connector screws at both ends of the IDE (media bay) 
connector located on the back of the bottom assembly.
M2 x 8.5-mm screw
modem retainer 
bracket
modem 
						

							26 Dell Latitude LS Portable Computers Service Manual
7. Remove the M2 x 8.5-mm screw that secures the modem retainer bracket 
and modem to the system board (see Figure 19).
The screw is located by the VGA port.
8. Remove the modem retainer bracket from the system board.
9. Pull the modem straight up to disconnect it from the system board.
10. Disconnect the modem cable from the connector on the system board.
To replace the modem, perform the following steps:
1. Connect the modem cable to the connector on the system board.
2. Align the connector on the bottom of the modem with the connector on 
the system board, and carefully press the modem onto the system board.
3. Put the modem retainer bracket in place.
4. Reinstall the M2 x 8.5-mm screw to secure the modem retainer bracket 
and modem to the system board.
5. Reinstall the two IDE connector screws at both ends of the IDE (media 
bay) connector located on the back of the bottom assembly.
6. Reinstall the four 5-mm socket screws for the VGA and parallel ports 
located on the back of the bottom assembly.
7. Reinstall the palmrest assembly.
8. Reinstall the keyboard assembly.
9. Reinstall the display assembly.
10. Reinstall the keyboard bezel. 
						

							support.dell.com Dell Latitude LS Portable Computers Service Manual 27
Fan 
Figure 20.  Fan Removal
1. Remove the keyboard bezel.
2. Remove the display assembly.
3. Remove the keyboard assembly.
4. Remove the palmrest assembly.
5. Carefully disconnect the fan wire connector from the system board       
(see Figure 20).
The male connector on the fan wire is keyed to fit into the female 
connector one way only.
6. Remove the two M2 x 3.5-mm screws that secure the fan to the bottom 
assembly (see Figure 20).
7. Remove the fan from the bottom assembly.
To replace the fan, perform the following steps:
1. Place the fan in the bottom case.
Make sure that the arrow that is stamped on top of the fan is pointing 
towards the thermal cooling solution.
2. Reinstall the M2 x 3.5-mm screws to secure the fan the bottom assembly.
3. Reconnect the fan wire to the connector on the system board assembly.
connector fan
M2 x 3.5-mm screws (2) 
						

							28 Dell Latitude LS Portable Computers Service Manual
4. Replace the palmrest assembly.
5. Replace the keyboard assembly.
6. Replace the display assembly.
7. Replace the keyboard bezel.
Speaker
Figure 21.  Speaker Removal 
1. Remove the keyboard bezel.
2. Remove the display assembly.
3. Remove the keyboard assembly.
4. Remove the palmrest assembly.
NOTICE: To ensure maximum cooling for the microprocessor, do not 
touch the glue side of the thermal conductive tape. The oils in your 
skin reduce the heat transfer capability on the glue side of the tape. 
5. Peel up the EMI adhesive sponge that connects the audio EMI shield to 
the thermal cooling solution (see Figure 21).
You only need to peel up the part of the sponge that lays on the thermal 
cooling solution. The end of the sponge that lays on the audio EMI shield 
can remain.
audio EMI 
shield
EMI adhesive sponge
speaker
speaker wire
connector
M2 x 3.5-mm 
screws (2) 
						

							support.dell.com Dell Latitude LS Portable Computers Service Manual 29
NOTICE: The audio EMI shield is attached to the USB connector   
housing with two-sided tape. To avoid bending the audio EMI shield, 
care must be taken when separating the audio EMI shield from the 
USB connector housing.
6. Using a small flat-blade screwdriver, carefully separate the audio EMI 
shield away from the USB connector housing.
Place the edge of the screwdriver between the audio EMI shield and the 
USB connector housing, and slowly pry the two apart.
7. Carefully disconnect the speaker wire connector from the system board.
The male connector on the speaker wire is keyed to fit into the female 
connector one way only.
8. Remove the two M2 x 3.5-mm screws that secure the speaker to the 
bottom assembly.
9. Remove the speaker from the bottom assembly.
10. Remove the rubber speaker gasket from the bottom assembly.
To replace the speaker, perform the following steps:
1. Reinstall the rubber speaker gasket in the bottom case.
The gasket is keyed, so it will fit in the bottom case one way only. 
2. Place the speaker in the bottom case.
3. The wire end of the speaker should face towards the center of the bottom 
assembly.
4. Reinstall the two M2 x 3.5-mm screws to secure the speaker to the 
bottom assembly.
5. Carefully connect the speaker wire to the connector in the system board 
assembly. 
The male connector on the speaker wire is keyed to fit into the female 
connector one way only.
6. Reinstall the audio EMI shield.
a. Carefully position the audio EMI shield so the section with the         
two-sided tape is over the USB connector housing. 
b. Press the audio EMI shield down so it attaches to the USB connector 
housing. 
c. Reattach the EMI adhesive sponge across the thermal cooling solution. 
						

							30 Dell Latitude LS Portable Computers Service Manual
7. Reinstall the palmrest assembly.
8. Reinstall the keyboard assembly.
9. Reinstall the display assembly.
10. Reinstall the keyboard bezel.
System Board Assembly 
6
Figure 22.  System Board Assembly Removal 
To remove the system board assembly, perform the following steps.
NOTICE: To avoid damaging the system board, you must remove the 
main battery before you service the computer.
PC Card cover
system board
fan assembly
M2 x 8.5-mm screw
audio I/O port cover audio EMI 
shield
fan wire connector
M2 x 4-mm 
screws (2)
thermal 
cooling solution
M2 x 3.5-mm 
screws (6)
modem retainer bracket
modem
reser ve batter y RTC batter y
bottom case 
assembly EMI clip 
location
EMI adhesive sponge
speaker
USB connector 
						

							support.dell.com Dell Latitude LS Portable Computers Service Manual 31
NOTICE: The processor is not replaceable. Do not attempt to remove 
the thermal cooling solution.
1. Remove the keyboard bezel.
2. Remove the display assembly.
3. Remove the keyboard.
4. Remove the palmrest assembly.
5. Use a 5-mm socket wrench to remove the four 5-mm socket screws for the 
VGA and parallel ports located on the back of the bottom case assembly.
6. Use a small flat-blade screwdriver to remove the two IDE connector 
screws at both ends of the IDE (media bay) connector located on the back 
of the bottom case assembly.
NOTICE: To ensure maximum cooling for the microprocessor, do not 
touch the glue side of the thermal conductive tape. The oils in your 
skin reduce the heat transfer capability on the glue side of the tape. 
7. Peel up the EMI adhesive sponge that connects the audio EMI shield to 
the thermal cooling solution (see Figure 22).
You only need to peel up the part of the sponge that lays on the thermal 
cooling solution. The end of the sponge that lays on the audio EMI shield 
can remain.
NOTICE: The audio EMI shield is attached to the USB connector    
housing with two-sided tape. To avoid bending the audio EMI shield, 
care must be taken when separating the audio EMI shield from the 
USB connector housing.
8. Using a small flat-blade screwdriver, carefully separate the audio EMI 
shield away from the USB connector housing.
Place the edge of the screwdriver between the audio EMI shield and the 
USB connector housing, and slowly pry the two apart.
9. Remove the two M2 x 4-mm screws that secure the audio I/O cover to the 
bottom case assembly.
10. Remove the audio I/O cover.
11. Remove the six M2 x 3.5-mm screws that secure the system board to the 
bottom case assembly.
White arrows on the system board assembly point to the  
M2 x 3.5-mm screws.
12. Remove the M2 x 8.5-mm screw that secures the modem retainer bracket.
13. Remove the modem retainer bracket from the bottom case assembly. 
						

							32 Dell Latitude LS Portable Computers Service Manual
14. Disconnect the speaker wire from the connector on the system board 
assembly.
15. Disconnect the fan wire from the connector on the system board 
assembly.
16. Lift the system board assembly out of the bottom case assembly.
To replace the system board assembly, perform the following steps:
1. Transfer the memory module(s) to the replacement system board 
assembly.
2. Place the new hard-disk drive EMI clip on the system board assembly     
(see Figure 23).
Figure 23.  Hard-Disk Drive EMI Clip
3. Place the system board assembly in the bottom case assembly.
The I/O ports should protrude comfortably through the openings at the 
back of the bottom case assembly.
4. Reconnect the fan wire to the connector on the system board assembly.
5. Reconnect the speaker wire to the connector on the system board 
assembly.
6. Replace the modem retainer bracket around the I/O ports and on top of the 
modem.
7. Reinstall the M2 x 8.5-mm screw on the right side of the modem to secure 
the modem retainer bracket to the system board assembly. 
The hole for the M2 x 8.5-mm screw is located by the VGA port.
8. Reinstall the six M2 x 3.5-mm screws that secure the system board 
assembly to the bottom case assembly.
White arrows on the system board assembly point to the screw holes.
One of the M2 x 3.5-mm screws passes through the hard-disk drive EMI 
clip (see Figure 23).
hard-disk drive 
EMI clip
M2 x 3.5-mm screw