Lenovo H520s Hardware Maintenance Manual page 50

Step 4. Remove the computer cover. Refer to "Removing the computer cover".
Step 5. Remove the front bezel. Refer to "Removing the front bezel".
Step 6. Remove the memory module. Refer to "Replacing a memory module".
Step 7. Remove the optical drive. Refer to "Replacing the optical drive".
Step 8. Remove the hard disk drive. Refer to "Replacing the hard disk drive".
Step 9. Remove the power supply. Refer to "Replacing the power supply".
Step 10. Remove the microprocessor fan. Refer to "Replacing the microprocessor fan".
Step 11. Remove the heat-sink. Refer to "Replacing the heat-sink".
Step 12. Remove the graphic card. Refer to "Replacing the graphic card".
Step 13. Remove the TV-Tuner card. Refer to "Replacing the TV-Tuner card".
Step 14. Remove the Wi-Fi card. Refer to "Replacing the Wi-Fi card".
Step 15. Remove the CPU. Refer to "Replacing the CPU".
Step 16. Disconnect the all cables from the connectors on motherboard.
Step 17. Remove the 6 screws that secure the motherboard to the chassis.
Step 18. Lift up the motherboard to remove it.
Step 19. Install the new motherboard:
a. Line up the holes on the new motherboard with mounting holes on the chassis and secure
it with screws.
b. Reattach the memory module, Wi-Fi card, CPU, heat-sink and microprocessor fan to the new
motherboard.
c. Connect the all cables to the new motherboard.
d. Reattach the power supply, hard disk drive, optical drive, graphic card and the TV-Tuner card.
Step 20. Reattach the front bezel, computer cover.
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Lenovo H520sHardware Maintenance Manual