Replacing The Power Switch Board - Lenovo IdeaCentre B540 Hardware Maintenance Manual

Replacing the power switch board

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
To replace the power switch board
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
Step 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O)
cables, and any other cables that are connected to the computer. Refer to "Left and right view"
and "Rear view" for help with locating the various connectors.
Step 4. Remove the rear cover. Refer to "Removing the rear cover".
Step 5. Remove the computer stand. Refer to "Removing the computer stand".
Step 6. Remove the memory modules. Refer to "Replacing a memory module".
Step 7. Remove the optical drive. Refer to "Replacing the optical drive".
Step 8. Remove the middle cover. Refer to "Removing the middle cover".
Step 9. Remove the EMI cover. Refer to "Removing the EMI cover".
Step 10. Remove the system fans. Refer to "Replacing the system fans".
Step 11. Remove the battery. Refer to "Replacing the battery".
Step 12. Remove the heat-sink. Refer to "Replacing the heat-sink".
Step 13. Remove the CPU. Refer to "Replacing the CPU".
Step 14. Remove the rear I/O module. Refer to "Replacing the rear I/O module".
Step 15. Remove the TV scalar board. Refer to "Replacing the TV scalar board".
Step 16. Remove the Wi-Fi card. Refer to "Replacing the Wi-Fi card".
Step 17. Remove the TV tuner card. Refer to "Replacing the TV tuner card".
Step 18. Remove the camera. Refer to "Replacing the camera".
Step 19. Remove the motherboard. Refer to "Replacing the motherboard".
Step 20. Remove the 9 screws that secure the chassis to the front bezel.
Step 21. Remove the 4 screws secure the LED panel to the chassis.
Step 22. Disconnect the touch cable from touch control board.
Step 23. Disconnect the converter cable from LED panel.
Step 24. Remove the Wi-Fi antenna from the front bezel.
Step 25. Remove the LED panel. Refer to "Replacing the LED panel".
Step 26. Push the pins to release the power switch board and pull it out.
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IdeaCentre B540–B540PHardware Maintenance Manual