HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 51

System board

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3. Remove the three Torx screws (5) that connect the power supply to the rear of the chassis. 4. Press the release lever at the front of the power supply (6), slide the power supply toward the front of the computer, and then lift the power supply out of the chassis (7). To install the power supply, reverse the removal procedures. System board To remove the system board, use these procedures. NOTE: All system board spare part kits include replacement thermal material. Before removing the system board, follow these steps: 1. Prepare the computer for disassembly (see Preparation for disassembly on page 19). 2. Remove the access panel (see Access panel on page 19). 3. Remove the optical drive (see Optical drive on page 22). 4. Remove the front bezel (see Front bezel on page 24). 5. Remove the drive cage (see Drive cage on page 33). 6. When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board: ● Memory modules (see Memory modules (DIMMs) on page 20) ● Heat sink (see Heat sink on page 39) ● Solid-state drive (see Solid-state drive on page 34) ● WLAN module (see WLAN module on page 35) ● Option board (see Option board on page 39) ● Expansion cards (see Expansion card on page 28) 44 Chapter 4 Removal and replacement procedures

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3.
Remove the three Torx screws
(5)
that connect the power supply to the rear of the chassis.
4.
Press the release lever at the front of the power supply
(6)
, slide the power supply toward the front of
the computer, and then lift the power supply out of the chassis
(7)
.
To install the power supply, reverse the removal procedures.
System board
To remove the system board, use these procedures.
NOTE:
All system board spare part kits include replacement thermal material.
Before removing the system board, follow these steps:
1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
19
).
2.
Remove the access panel (see
Access panel
on page
19
).
3.
Remove the optical drive (see
Optical drive
on page
22
).
4.
Remove the front bezel (see
Front bezel
on page
24
).
5.
Remove the drive cage (see
Drive cage
on page
33
).
6.
When replacing the system board, be sure that the following components are removed from the defective
system board and installed on the replacement system board:
●
Memory modules (see
Memory modules (DIMMs)
on page
20
)
●
Heat sink (see
Heat sink
on page
39
)
●
Solid-state drive (see
Solid-state drive
on page
34
)
●
WLAN module (see
WLAN module
on page
35
)
●
Option board (see
Option board
on page
39
)
●
Expansion cards (see
Expansion card
on page
28
)
44
Chapter 4
Removal and replacement procedures