Dell Vostro 1720 (Early 2009) - Manual (Page 51)

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Heat Sink and Processor
Dell™ Vostro™ 1720 Service Manual
Removing the Heat Sink and Processor
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the battery from the computer.
3. Remove the access panel from the computer.
4. Remove the fan from the computer.
5. Loosen the four captive screws that secure the heat sink to the system board.
6. Lift the edge of the heat sink that is closest to the center of system board.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best
practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.