Dell Inspiron Lm Service Guide

							Removing and Replacing Parts 4-25
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.
.
Figure 4-20.  LCD Panel Removal
To remove an LCD panel, follow these steps:
1. Remove the front bezel.
See the previous subsection, “Front Bezel.”
2. Remove LCD panel screws H11, H12, H13, and H14.
3. Remove the LCD Panel.
NOTE:  Be careful when removing any part of the LCD flex cable.
Lift up the LCD panel, and disconnect the LCD flex-cable connector. Dis-
connect the LCD panel cable from the upper inverter-board connector. 
Disconnect the LCD flex cable from the lower inverter-board connector.
LCD panel
(screws H15 and 
H16 are 3 mm) H11
 H12  H13
 H14
(screws H11–H14 
are 6 mm) LCD flex cable
power/ 
suspend 
indicator
6 mm
3 mm
inverter board microphone
lower 
connectorupper 
connector
H15H16 
						

							4-26 Dell Latitude LM Systems Service Manual
Inverter Board
.
Figure 4-21.  Inverter Board Removal
To remove the inverter board, follow these steps:
1. Remove the front bezel.
See “Front Bezel” found earlier in this section.
2. Remove the LCD panel.
See the previous subsection, “LCD Panel.” 
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.
inverter board
 H15
 H16
power/suspend indicator
(screws H15 and H16 are 3 mm)
3 mm 
						

							Removing and Replacing Parts 4-27
LCD Assembly Latches
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. Use a scribe to pry the latches from the back bezel.
Be careful not to lose the small spring that is part of each latch. 
latch (2)
back bezel 
spring (2) 
						

							4-28 Dell Latitude LM Systems Service Manual
Power/Suspend Indicator
Figure 4-23.  Power/Suspend Indicator Removal
To remove the power/suspend indicator, 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. 
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.
power/suspend indicatorback bezel 
power/suspend 
indicator connector
inverter board 
						

							Removing and Replacing Parts 4-29
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.
3. Remove the inverter board.
See “Inverter Board” found earlier in this section.
4. Remove the latches.
See “LCD Assembly Latches” found earlier in this section.
5. Remove the power/suspend indicator.
See the previous subsection, “Power/Suspend Indicator.”
back bezel 
						

							4-30 Dell Latitude LM Systems Service Manual
Keyboard
This section provides the removal procedure for the keyboard. Also, it includes 
the removal procedure for the heat sink.
Figure 4-25.  Keyboard Removal
To remove the keyboard, follow these steps:
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.
screw covers (2)
S1
S2
S4S3
heat sink
keyboard cable
main board
(screws S1 and S2 are 3 mm)
(screws S3 and S4 are 5.5 mm)
5.5 mm
3 mm 
						

							Removing and Replacing Parts 4-31
4. Remove heat sink screws S3 and S4.
Lift off 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. 
6. Remove the keyboard from the computer.CAUTION:  Lift away the heat sink gently. Rough handling could
damage the thermal pad on the bottom of the heat sink.
CAUTION:  Lift away the cable only after the ZIF connector is
opened (see “ZIF Connectors” found earlier in this chapter). Pulling
the cable from the connector damages the conductive coating on the
end of the cable. 
						

							4-32 Dell Latitude LM Systems Service Manual
Top Assembly
The top assembly consists of the plastic palm rest and its related components. 
The subsections that follow provide removal and replacement procedures for 
the components of the top assembly.
Figure 4-26.  Top Assembly Removal
hinge cover (2)
keyboard
touch pad connector
main board
top assembly 
bottom assembly
(screws SD1 andSD2 are 5 mm)
 SD3
 5 mm  
SD4
hook
display close button
 SD1
 SD2
(screws SD3 andSD4 are 3 mm)
 3 mm
Production Note!!!  
						

							Removing and Replacing Parts 4-33
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.
5. Separate the top assembly from the bottom assembly.
Insert your fingertips or a scribe in the crevice between the top assembly 
and the bottom assembly, and lift up on the top assembly to release the hid-
den tabs spaced around the sides, front, and back.
When replacing the top assembly, orient the assembly in its original position 
on the bottom assembly and press firmly near each tab until the hidden tabs 
snap into place. 
6. Disconnect the status-display board connector.
Use a small flat-blade screwdriver to release the connector from the main 
board. Release the wire bundle from the hook on the I/O bracket. 
7. Remove the power supply board.
8. Disconnect the LCD flex-cable connector on the main board.
Remove flex-cable screws SD3 and SD4. There is a ground wire attached to 
screw SD4.  
9. Remove the top assembly from the computer.CAUTION:  Do not attempt to remove the LCD flex cable from the
top assembly. The two connectors on the cable will not pass through
the slot on the back of the top assembly.   
						

							4-34 Dell Latitude LM Systems Service Manual
Speakers
Figure 4-27.  Speakers Removal
To remove the speakers, follow these steps:
1. Remove the top assembly.
See the previous section, “Top Assembly.” 
2. Remove speaker screws S5, S6, S22, and S23.
Remove the plastic housing holding the 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.
S5(screws S22 and S23are 6 mm)
S6
plastic housing (2)
speaker (2)
speaker connectorstatus display board
top assembly
6 mm
(screws S5 and S6are 3 mm)
3 mm
S22
S23