Dell Inspiron 4000 Parts Manual

							Removing and Replacing Parts131
5Remove the M2 x 4-mm screw that secures the display flex cable to the 
display assembly through the flex-cable retention bracket (black 
plastic).
6Lift and rotate the top of the LCD panel out of the top cover.
Replacing the 14.1-Inch LCD Panel
 HINT: Use a magnetic 
screwdriver to reassemble 
the LCD panel in the 
display, and secure the 
right side first. Make sure 
to replace the magnet 
with the minus sign 
toward the bottom of the 
display. 1Place the bottom edge of the LCD panel in the bottom of the top 
cover, and elevate the top of the panel with your hand.
2Lay the LCD panel in the top cover.
3Reinstall the five M2 x 4-mm screws securing the LCD panel to the 
top cover.
Removing the Display-Feed Flex Cable
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
LCD panel connector
top flex cable connector
pull tab
bottom flex cable 
connector
inverter 
connector 
						

							132Removing and Replacing Parts
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1Remove the hard drive assembly.
2Remove the display assembly.
3Remove the display assembly bezel.
4Remove the tape that covers the connector to the LCD panel located 
at the top of the display-feed flex cable.
5Hold the connector at the top of the display-feed flex cable, and pull 
down and away to remove it from the LCD panel.
Display Assembly Latch
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
M2.5 x 5-mm screw (2)
bezel latch 
						

							Removing and Replacing Parts133
1Remove the hard drive assembly.
2Remove the display assembly.
3Remove the display assembly bezel.
4Remove the display assembly bezel latch by removing the two M2.5 x 
5-mm screws that secure it to the display assembly top cover.
Hinge Covers
Removing the Hinge Covers 
1Remove the display assembly.
2Remove the plastic hinge covers from the hinges.
Replacing the Hinge Covers
1Attach the display assembly to the bottom case assembly.
 HINT: The right hinge 
cover is labeled “R,” and 
the left hinge cover is 
labeled “L.” The labels 
face the back of the 
computer. 2Close the display assembly and snap the hinge covers in place over the 
hinges. 
						

							134Removing and Replacing Parts
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right hinge cover
left hinge cover 
						

							Removing and Replacing Parts135
Palm Rest Assembly
 Removing the Palm Rest Assembly
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Remove the keyboard.
 NOTICE: You must remove the display assembly before you remove the palm 
rest assembly; the display assembly hinges pass through the back of the palm 
rest assembly.
3
Turn the computer right-side up on the work surface, and remove the 
display hinge cover and display assembly.
4Turn the computer over and remove the three M2.5 x 12-mm screws 
labeled with a “circle P.”
5Remove the five M2 x 3-mm screws that secure the palm rest to the 
bottom case assembly:
M2.5 x 12-mm screws (3)M2 x 3-mm 
screws (2) 
						

							136Removing and Replacing Parts
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aRemove the two M2 x 3-mm screws located in the hard drive bay 
door and labeled with a “circle P.”
bRemove the remaining two M2 x 3-mm screws located on the back 
edge of the bottom case assembly, underneath the display 
assembly.
cTurn the bottom case assembly over. Remove the M2 x 3-mm 
screw located underneath the keyboard, on the right side of the 
bottom case assembly, next to the microprocessor thermal cooling 
assembly.
6Pull up on the loop attached to the palm rest flex cable connector to 
remove it from the interface connector on the system board assembly.
palm rest assembly
touch pad connectorbottom case assemblypalm rest flex cableM2 x 3-mm screw  
						

							Removing and Replacing Parts137
7Using the plastic scribe along the edge of the plastic, remove the palm 
rest assembly from the bottom case assembly.
Microprocessor Thermal Cooling 
Assembly
Removing the Microprocessor Thermal Cooling Assembly
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Turn the computer over and remove the keyboard assembly.
3Remove the display assembly.
captive screw (4)
thermal cooling assembly 
						

							138Removing and Replacing Parts
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4Loosen the four captive screws securing the microprocessor thermal 
cooling assembly.
5Remove the microprocessor thermal cooling assembly from the system 
board assembly.
6Remove the two M2.5 x 5-mm screws and the one M2 x 3-mm screw 
that secure the hybrid cooling fan to the system board.
 HINT: The fan power 
cable is long and can be 
pulled out from under the 
EMI shield to provide 
access to the connector.7Disconnect the fan power cable from the system board interface 
connector and remove the hybrid cooling fan.
 CAUTION: Do not block the keyboard screw hole when reinserting 
the fan cable.
M2.5 x 5-mm screw (2) M2 x 3-mm 
screw (1) 
						

							Removing and Replacing Parts139
Microprocessor Module
 NOTICE: Hold the microprocessor down while turning the cam screw to 
prevent intermittent contact between the cam screw and the microprocessor.
 NOTICE: Disconnect the computer and any attached devices from electrical 
outlets, and remove any installed batteries.
 NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or 
by touching an unpainted metal surface on the computer.
 NOTICE: Rea d “Preparing to Work Inside the Computer” before performing 
the following procedure.
1
Remove the hard drive assembly.
2Turn the computer over and remove the keyboard.
 NOTICE: To ensure maximum cooling for the microprocessor, do not touch 
the heat transfer areas on the thermal cooling assembly. The oils in your skin 
reduce the heat transfer capability of the thermal pads.
3
Remove the thermal cooling assembly.
 NOTICE: When removing the microprocessor module, pull the module 
straight up. Be careful not to bend the pins on the microprocessor module.
4
Remove the microprocessor module:
ZIF socket 
cam screwpin-1 corner
Type I ZIF socket
lo
ck
perpendicular 
screwdriver
processor die
(do not touch)
ZIF socket 
cam screwpin-1 corner
loc
k
Type II ZIF socketprocessor die
(do not touch) perpendicular 
screwdriver 
						

							140Removing and Replacing Parts
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 NOTICE: To avoid damaging the microprocessor while removing the cam 
screw, hold the screwdriver so that it is perpendicular to the microprocessor.
aUse a small flat-head screwdriver and rotate the ZIF socket cam 
screw 180 degrees to loosen the ZIF socket.
The ZIF socket cam screw secures the microprocessor assembly to 
the system board assembly. Take note of the arrow on the ZIF 
socket cam screw points to the front of the computer when 
engaged.
bUse a microprocessor extraction tool to remove the microprocessor 
module.
Replacing the Microprocessor Module
 HINT: To update or 
reflash the BIOS, see the 
Dell Portable Computer 
BIOS Update Guide 
for 
instructions
.
 NOTICE: After replacing the microprocessor module, update the BIOS using 
a flash BIOS update program floppy disk or CD.
 NOTICE: Seating the microprocessor module properly in the ZIF socket does 
not require force.
 NOTICE: A microprocessor module that is not properly seated can result in 
an intermittent connection or permanent damage to the microprocessor and 
ZIF socket.
1
Align the pin-1 corner of the microprocessor module with the pin-1 
corner of the microprocessor socket on the system board and insert the 
microprocessor module. 
 NOTICE: You must position the microprocessor module correctly in the ZIF 
socket to avoid permanent damage to the module and the socket.
When the microprocessor module is correctly seated, all four corners 
are aligned to the same height. If one or more corners of the module 
are higher than the others, the module is not seated correctly.
 NOTICE: Hold the microprocessor down while turning the cam screw to 
prevent intermittent contact between the cam screw and microprocessor.
2
Tighten the ZIF socket cam screw to secure the microprocessor 
module to the system board assembly.