Dell Inspiron 4150 - Manual (Page 58)

11. Remove the speaker assemblies from the bottom case.
12. Pull the right side of the bottom case, next to the external headphone and microphone connectors, away from the system board as you simultaneously
lift the front of the system board out and away from the bottom case.
Replacing the System Board
1. Install the microprocessor on the replacement system board.
2. Install the replacement system board:
a. Insert the external microphone and headphone connectors through the bottom case.
b. Replace the six M2.5 x 5-mm screws, starting on the right side of the bottom case.
c. Replace the fan guard, inserting the tab into the bottom case, and replace the three M2.5 x 5-mm screws. Replacing the screw opposite the tab
first makes it easier to insert and replace the other two screws.
3. Install the modem and the microprocessor thermal cooling assembly that you removed from the old system board.
4. Connect the right and left speaker assemblies that came with the new system board in the bottom case.
5. Replace the palm rest, the keyboard, the display, and the hard drive.
6. Replace the module bay devices and any PC Cards or plastic blanks in the PC Card slot.
7. Insert the CD that accompanied the replacement system board into the drive, and turn on the computer. Follow the instructions on the screen.
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1 M2.5 x. 5-mm screw (1)
HINT: Route cables so that they are not crimped or pinched when the complete assembly is put back together.
HINT: After installing the system board, enter the computer service tag sequence into the BIOS of the replacement system board.