HP 250 G4 Service Manual page 61

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Discrete graphics: Thermal paste is used on the processor and associated heat sink area (1)(2), as well
as the graphics chip and associated heat sink area (3)(4).
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UMA graphics (Intel Core processors): Thermal paste is used on the heat sink (1) and the processor (2).
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Intel Pentium and Celeron processors: Thermal paste is used on the heat sink (1) and processor (2).
Component replacement procedures 53