Lenovo ThinkCentre E51 Hardware Maintenance Manual - Page 101

5. Lift the power supply out of the chassis. 6. Install the new power supply and insert the four screws that hold the power supply in place. 7. Reconnect all power supply cables to the system board and the drives. Make sure the cables are correctly routed. See the system board illustration for your machine type at "Identifying parts on the system board" on page 86. 8. Go to "Completing the FRU replacement" on page 116. Replacing the system board The procedure for replacing the system board is different depending on the machine type of the computer. Note: When replacing the system board, a new retention bracket for the microprocessor heat sink is required. Make sure you have a new retention bracket before beginning this procedure. Machine types 8290, 8291, 8292, 8469, 8472, 8708, 8709, 8719, 8771, 8772, 8776, 8777, 8817, 9214, 9215, and 9216 1. Remove the left-side cover. See "Removing the covers" on page 85. 2. Place the computer on its right side to help make the system board more accessible. 3. Remove any adapter cards installed in the PCI connectors. See "Replacing a PCI adapter" on page 92. 4. Carefully take note of the location of all cable connections on the system board and disconnect all cables. See the system board illustration for your machine type at "Identifying parts on the system board" on page 86. 5. Remove the screws that secure the system board to the chassis. 6. Lift the system board out of the chassis. 7. Remove the memory modules from the failing system board and install them in the same location on the new system board. 8. Disconnect the heat sink and fan assembly cable from the system board. See the system board illustration for your machine type at "Identifying parts on the system board" on page 86. 9. Remove the four screws 1 securing the heat sink and fan assembly to the system board. Chapter 8. Replacing FRUs (Tower computers) 95