HP Pro Mini 400 G9 Desktop PC Maintenance and Service Guide - Page 45

System board

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1. Prepare the computer for disassembly (see Preparation for disassembly on page 20). 2. Remove the access panel (see Access panel on page 20). 3. Remove the fan (see Fan on page 26). 4. If installed, remove the heat sink (see Processor heat sink on page 36). Remove the processor: 1. Pull the locking lever away from the processor (1), and then rotate the lever to its full open position (2). 2. Raise and rotate the microprocessor retainer to its fully open position (3). 3. Carefully lift the processor from the socket (4). IMPORTANT: Do not handle the pins in the processor socket. These pins are fragile, and handling them could cause irreparable damage. If pins are damaged, you might have to replace the system board. The heat sink must be installed within 24 hours of installing the processor to prevent damage to the processor's solder connections. To install the processor, reverse the removal procedures. NOTE: After installing a new processor onto the system board, always update the system ROM to ensure that the latest version of the BIOS is being used on the computer. For more information, see: https://support.hp.com/us-en/document/c06366640. System board To remove the system board, use these procedures. NOTE: All system board spare part kits include replacement thermal material. 38 Chapter 4 Removal and replacement procedures

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1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
20
).
2.
Remove the access panel (see
Access panel
on page
20
).
3.
Remove the fan (see
Fan
on page
26
).
4.
If installed, remove the heat sink (see
Processor heat sink
on page
36
).
Remove the processor:
1.
Pull the locking lever away from the processor
(1)
, and then rotate the lever to its full open position
(2)
.
2.
Raise and rotate the microprocessor retainer to its fully open position
(3)
.
3.
Carefully lift the processor from the socket
(4)
.
IMPORTANT:
Do not handle the pins in the processor socket. These pins are fragile, and handling them
could cause irreparable damage. If pins are damaged, you might have to replace the system board.
The heat sink must be installed within 24 hours of installing the processor to prevent damage to the
processor’s solder connections.
To install the processor, reverse the removal procedures.
NOTE:
After installing a new processor onto the system board, always update the system ROM to ensure
that the latest version of the BIOS is being used on the computer. For more information, see:
.
System board
To remove the system board, use these procedures.
NOTE:
All system board spare part kits include replacement thermal material.
38
Chapter 4
Removal and replacement procedures