Replacing The Motherboard - Lenovo C345 Hardware Maintenance Manual

Step 10. Gently push the pin that locks the power switch board to release it, then slide the power switch
board out.
Step 11. Disconnect the data cable from the power switch board.
Step 12. To install the power switch board:
a. Line up the hole on the new power switch board with the mounting hole on the LED panel(待
确认), then place it into position.
b. Connect the power cable to the new power switch board.
Step 13. Reattach the EMI cover, middle cover, optical drive, stand holder, foot cover and stand base.

Replacing the motherboard

Note: Turn off the computer and wait 3 to 5 minutes to let it cool down before removing the cover.
Note: It may be helpful to place the computer face-down on a soft flat surface for this procedure. Lenovo
recommends that you use a blanket, towel, or other soft cloth to protect the computer screen from scratches
or other damage.
To replace the motherboard:
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 stand base. Refer to "Removing the stand base".
Step 5. Remove the foot cover. Refer to "Removing the foot cover".
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 stand holder. Refer to "Removing the stand holder".
50
Lenovo C345/C445 All-In-One PCHardware Maintenance Manual