3. When installing a heat sink, be sure to install thermal material onto the heat sink in the location
shown in the following illustration.
To install a heat sink, reverse this procedure.
System board
To remove the system board, use these procedures and illustrations.
Table 6-10
System board descriptions and part numbers
Description Spare part number
System board (includes integrated processor)
All system boards use the following part numbers:
xxxxxx-001: Non-Windows operating systems
xxxxxx-301: Windows IoT operating system
AMD Ryzen 3 7335U processor, models with WWAN N99803-xx1
AMD Ryzen 3 7335U processor N99804-xx1
AMD Ryzen 5 7535U processor, models with WWAN N99805-xx1
AMD Ryzen 5 7535U processor N99806-xx1
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 38).
2. Remove the bottom cover (see Bottom cover on page 38).
3. Remove the battery (see Battery on page 48).
4. Remove the fan (see Fan on page 52).
NOTE: You do not have to remove the heat sink to remove the system board.
When you replace the system board, be sure to remove the following components (as applicable) from
the defective system board and install them on the replacement system board:
System board
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