Dell Inspiron 3000 Service Manual

							Removing and Replacing Parts 4-45
Base Assembly
The base assembly consists of the following components: 
•IR lens
•Processor board
•LVDS board (13.3-inch LCD only)
•USB board
•Main board
•Audio bezel
•Audio board
•PC Card cage
•Latch assembly
•BIOS door
•Rubber feet
The following subsections provide removal and replacement procedures for 
most of the components of the base assembly. Procedures for the BIOS door, 
rubber feet, and 13.3-inch bumpers are not shown because they are obvious. 
The procedures in this subsection assume that the palmrest assembly and LCD 
assembly have been removed. 
						

							4-46 Dell Inspiron 3000 Series Service Manual
 
Figure 4-29.  Base Assembly 
base assembly
main board
audio board
LVDS board(13.3-inch LCD only)
IR lens
processor board
audio bezel
PC Card cage
USB boardconnector JP16 
						

							Removing and Replacing Parts 4-47
IR Lens
Figure 4-30.  IR Lens Removal 
Remove the IR lens by gently pulling straight up on the lens with the fingers of 
one hand.   
IR lens 
						

							4-48 Dell Inspiron 3000 Series Service Manual
Processor Board
Figure 4-31.  Processor Board Removal
Remove the processor board from the main board.
The processor board is held in place on the main board by connectors JP18 and 
JP19. Using the fingers of one hand, gently remove the processor board from 
the main board by pulling straight up. Do not rock the processor board to 
remove it. This may damage the two connectors on the processor board or the 
main board. 
There is a rubber bumper on the upper right corner of the processor board. The 
bumper assists in keeping the processor board in place. If you install a replace-
ment processor board, be sure to apply a bumper in that corner of the processor 
board. Also, there is heat-sink thermal pad on top of the microprocessor and this 
may need to be reinstalled.
When reinstalling the Inspiron M166ST, M200ST, M233ST, or M233XT pro-
cessor board, press down on the white dot on top of the board. The white dot 
indicates the best spot to apply pressure to seat the processor correctly on con-
nectors JP18 and JP19. (White dot references on the Inspiron D233ST, 
D233XT, and D266XT processor boards are not necessary.) 
main board
processor board
connector JP18
connector JP19
rubber bumper 
						

							Removing and Replacing Parts 4-49
LVD S B o a rd
The LVDS board is present on computers with a 13.3-inch LCD. If you have a 
12.1-inch LCD, skip this subsection.  
Figure 4-32.  LVDS Board Removal
To remove the LVDS board, follow these steps:
1. Remove LVDS board screw G2.
This is the other screw that you left in place when you removed the 
13.3-inch LCD cable harness from connector JP1 on the LVDS board.
2. Remove the LVDS board from the main board.
The LVDS board is held in place on the main board by connectors JP8 and 
JP12.
3. Remove the LVDS board from the computer.
LVDS board
main board
G2
(screw G2
is 3 mm)
3 mm
connector JP8
connector JP12
connector JP1 
						

							4-50 Dell Inspiron 3000 Series Service Manual
USB Board
Figure 4-33.  USB Board Removal
To remove the USB board, follow these steps:
1. Remove USB board screw U1.
2. Disconnect the USB board from connector JP9 on the main board.
With the fingers of one hand, gently pull the USB board straight up about 
1/4-inch to free it from connector JP9. Then turn the board slightly to the 
right to remove it from the corner of the main board and the base assembly. 
(screw U1is 5 mm)
5 mm
U1
connector JP9
USB board 
						

							Removing and Replacing Parts 4-51
Main Board
Figure 4-34.  Main Board Removal 
To remove the main board, follow these steps:
1. Remove the processor board.
2. If one is installed, remove the LVDS board. Otherwise, go to step 3.
3. Remove the USB board.
4. Remove main board screws M1, M2, and M3.
5. Remove standoff nuts ST1, ST2, and ST3.
6. Remove the main board from the base assembly.
Lift the end of the board nearest the front of the computer, and pull the 
board up and out of the computer.
Remove the I/O panel bracket only if you have to replace it. The I/O panel 
bracket can be removed from the main board by removing standoff nuts ST4 
through ST11. Use a 5-mm nut driver to remove standoff nuts ST4-ST9 and 
a 6-mm nut driver for ST10 and ST11.
If the threads on the two hinge blocks are damaged, the I/O panel bracket 
will have to be replaced.
(screws M1, M2, M3, 
and ST4–ST9 are 5 mm) main boardST11
ST10
ST4–ST9
ST1 I/O panel bracket
(standoffs ST1, ST2, ST3, 
ST10, and ST11 are 6 mm)
6 mm
5 mm
ST2
ST3M1
M2 M3
hinge blocks (2) 
						

							4-52 Dell Inspiron 3000 Series Service Manual
Audio Bezel
Figure 4-35.  Audio Bezel Removal
Remove the audio bezel by gently pulling it from the three audio jacks on the 
left side of the main board. This bezel usually drops out when the main board is 
removed from the computer.
audio bezel 
						

							Removing and Replacing Parts 4-53
Audio Board
Figure 4-36.  Audio Board Removal 
To remove the audio board, follow these steps:
1. Remove the main board.
2. Remove the audio board from the bottom of the main board.
The audio board is held in place by two connectors on the main board (JP26 
and JP22) and two connectors on the audio board (JP1 and JP2). The con-
nectors are different sized to ensure correct placement when reinstalling the 
audio board. 
Ensure that you reinstall the audio board when you reinstall the main board. 
Make sure there are two rubber bumpers installed on the side of the audio board 
next to the back cover. 
audio board
main board
connector JP1connector JP2 
						

							4-54 Dell Inspiron 3000 Series Service Manual
PC Card Cage
Figure 4-37.  PC Card Cage Removal 
To remove the PC card cage, follow these steps:
1. Remove the main board.
Use a support for the main board to prevent the board from flexing when the 
card cage screws are removed
2. Remove PC Card cage screws P1, P2, P3, and P4.
Screws P2 and P4 have ground springs attached. There are plastic insulators 
on the main board, below the ground springs.
3. Remove the top of the card cage.
Disconnect the top from connector JP11 on the main board.
4. Remove the bottom of the card cage.
Disconnect the bottom from the connector next to JP11 on the main board. 
A mylar covering is attached to the main board below the bottom of the card 
cage.
Replace the PC Card cage if it is damaged.
PC Card cage (top and bottom)
(screws P1–P4 are 13 mm)P1
13 mm
main board
P2
P3
P4
ground springs (2)
connector JP11