Lenovo A540 All In One Lenovo A540/A740 Hardware Maintenance Manual - Page 43

Replacingthepowerswitchboard

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Step 3. Step 4. Step 5. Step 6. Step 7. 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. Remove the base cover. Refer to "Removing the base cover". Remove the hinge from the chassis. Refer to "Removing the hinge from the chassis". Remove the rear cover. Refer to "Removing the rear cover". Lift up the Wi-Fi card to remove it from the socket. Step 8. Disconnect the antenna cable and data cable from the Wi-Fi card. Step 9. To install the new Wi-Fi card: a. Connect the antenna cable to the new Wi-Fi card. b. Line up the new Wi-Fi card with the socket, snap it into position and secure it with the pins. Step 10. Reattach the rear cover to the LED panel. Step 11. Reattach the hinge to the chassis, and reconnect the touch and LED panel cables to the motherboard. Step 12. Reattach the base cover and secure it with the screws. 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. Chapter 7. Replacing hardware 37

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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 base cover. Refer to “Removing the base cover”.
Step 5.
Remove the hinge from the chassis. Refer to “Removing the hinge from the chassis”.
Step 6.
Remove the rear cover. Refer to “Removing the rear cover”.
Step 7.
Lift up the Wi-Fi card to remove it from the socket.
Step 8.
Disconnect the antenna cable and data cable from the Wi-Fi card.
Step 9.
To install the new Wi-Fi card:
a.
Connect the antenna cable to the new Wi-Fi card.
b.
Line up the new Wi-Fi card with the socket, snap it into position and secure it with the pins.
Step 10. Reattach the rear cover to the LED panel.
Step 11. Reattach the hinge to the chassis, and reconnect the touch and LED panel cables to the
motherboard.
Step 12. Reattach the base cover and secure it with the screws.
Replacingthepowerswitchboard
Note:
Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
Toreplacethepowerswitchboard
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.
Chapter 7
.
Replacing hardware
37