Lenovo F0B2 [C20-30] Hardware Maintenance Manual page 44

Step 8. Remove all the cables connected to the motherboard.
Step 9. Remove the five screws that secure the motherboard to the rear cover and push the pin to release
the heat-sink as shown.
Step 10. Slide out the motherboard as shown.
Step 11. Remove the screws that secure the heat-sink module to the motherboard, and then lift up the
heat-sink to remove it.
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Lenovo C20 Series Non-Touch All-In-One PC Hardware Maintenance Manual