HP Pavilion Dv9400 Entertainment Notebook Pc Series Service Guide

							Removal and Replacement Procedures
Maintenance and Service Guide 5–75
5.24 System Board
✎When replacing the system board, ensure that the following 
components are removed from the defective system board and 
installed on the replacement system board:
■Memory modules (Section 5.6)
■RTC battery (Section 5.7)
■Mini Card module (Section 5.8)
■Bluetooth module (Section 5.18)
■ExpressCard assembly (Section 5.20)
■Optical drive connector module (Section 5.24)
■Fan/heat sink assembly (Section 5.25)
■Processor (Section 5.26)
1. Prepare the computer for disassembly (Section 5.3) and 
remove the following components:
❏Hard drive (Section 5.4)
❏Optical drive (Section 5.9)
❏Switch cover (Section 5.10)
❏Keyboard (Section 5.11)
❏Speaker assembly (Section 5.12)
❏Display assembly (Section 5.14)
System Board Spare Part Number Information
For use with only computer models using Intel processors:
G73 (includes 512-MB of video RAM)
G73M (includes 256-MB of video RAM)
G73 (includes 512 MB of video RAM) - for Germany only
G73 (includes 256 MB of video RAM) - for EMEA only434660-001
434659-001
441620-001
445178-001
For use only with UMA computer models using AMD processors 444002-001 
						

							5–76 Maintenance and Service Guide
Removal and Replacement Procedures
❏Top cover (Section 5.15)
❏Wireless switch board (Section 5.16)
❏Audio board (Section 5.17)
❏USB/magnetic board (Section 5.19)
❏Top cover support trim (Section 5.21)
❏USB board (Section 5.23)
❏Power connector assembly (Section 5.23)
2. Turn the computer upside down with the front toward you.
3. Remove the Phillips PM2.5×8.0 screw that secures the 
system board to the base enclosure.
Removing the System Board Screw, Part 1 
						

							Removal and Replacement Procedures
Maintenance and Service Guide 5–77
4. Remove the three Phillips PM2.5×8.0 screws 1 and the three 
silver Phillips PM2.5×5.0 screws 2 that secure the system 
board to the base enclosure.
Removing the System Board Screws, Part 2 
						

							5–78 Maintenance and Service Guide
Removal and Replacement Procedures
5. Lift the right side of the system board 1 until it rests at 
an angle.
6. Remove the optical drive connector board 2.
✎The optical drive connector board is available using spare part 
number 432992-001.
7. Slide the system board 3 to the right until the connectors on 
the left side of the system board disengage from the 
base enclosure.
8. Remove the system board.
Removing the System Board 
						

							Removal and Replacement Procedures
Maintenance and Service Guide 5–79
9. If it is necessary to replace the power connector assembly or 
the USB board cable, turn the system board upside down with 
the front toward you.
10. Disconnect the power connector assembly cable 1 and the 
USB board cable 2 from the system board.
Removing the System Board Cables
Reverse the above procedure to install the system board, power 
connector assembly, and audio board cable. 
						

							5–80 Maintenance and Service Guide
Removal and Replacement Procedures
5.25 Fan/Heat Sink Assembly
✎When replacing the fan/heat sink assembly, be sure the display 
lid switch module is removed from the defective fan/heat sink 
assembly and installed on the replacement fan/heat sink 
assembly. Refer to Section 5.22, “Display Lid Switch 
Module,” for display lid switch module removal information.
1. Prepare the computer for disassembly (Section 5.3) and 
remove the following components:
❏Hard drive (Section 5.4)
❏Optical drive (Section 5.9)
❏Switch cover (Section 5.10)
❏Keyboard (Section 5.11)
❏Speaker assembly (Section 5.12)
❏Display assembly (Section 5.14)
❏Top cover (Section 5.15)
❏Wireless switch board (Section 5.16)
❏Audio board (Section 5.17)
❏USB/magnetic board (Section 5.19)
❏Top cover support trim (Section 5.21)
❏USB board (Section 5.23)
❏Power connector assembly (Section 5.23)
❏System board (Section 5.24)
Fan/Heat Sink Assembly Spare Part Number Information
For use only with computer models using Intel processors 434678-001
For use only with computer models using AMD processors 438606-001 
						

							Removal and Replacement Procedures
Maintenance and Service Guide 5–81
2. Turn the system board upside down with the expansion port 
and external monitor port toward you.
3. Disconnect the fan cable 1 from the system board.
4. Loosen the four captive Phillips PM2.5×6.0 screws 2 that 
secure the fan/heat sink assembly to the system board.
5. Remove the fan/heat sink assembly 3.
Removing the Fan/Heat Sink Assembly 
						

							5–82 Maintenance and Service Guide
Removal and Replacement Procedures
✎The thermal pads and thermal paste should be thoroughly 
cleaned from the surfaces of the fan/heat sink assembly 1, 2, 
and 3, the system board components 4 and 6, and the 
processor 5 each time the fan/heat sink assembly is removed. 
Thermal pads and thermal paste should be installed on all 
surfaces before the fan/heat sink assembly is reinstalled. 
Thermal pads and thermal paste are included with all fan/heat 
sink assembly, system board, and processor spare part kits.
Thermal Pad and Thermal Paste Locations 
						

							Removal and Replacement Procedures
Maintenance and Service Guide 5–83
6. Loosen the three captive silver Phillips PM2.5×5.0 screws 1 
that secure the heat sink to the system board.
7. Remove the heat sink 2.
Removing the Heat Sink 
						

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Removal and Replacement Procedures
✎The thermal pads and thermal paste should be thoroughly 
cleaned from the surfaces of the heat sink 1, 2, and 3 and the 
system board components 4, 5, and 6, each time the heat sink 
is removed. Thermal pads and thermal paste should be installed 
on all surfaces before the heat sink is reinstalled. Thermal pads 
and thermal paste are included with all heat sink and system 
board spare part kits.
Thermal Pad and Thermal Paste Locations
Reverse the above procedure to install the fan/heat sink assembly.