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System board removal and installation - ThinkCentre A51, A52, M52, M52e

View system board removal movie
View system board installation movie

 

Attention: Do not remove the computer cover or attempt any repair before reading the" Important safety information" in the Quick Reference that was included with your computer or in the Hardware Maintenance Manual (HMM) for the computer. To obtain copies of the Quick Reference or HMM, go to the Support Web site at /ContentResources/Migrated Assets/think/support.

  1. Turn off the computer and allow it to cool for one hour.
  2. Remove the computer cover. See "Cover removal and installation".
  3. To access the system board, lay the computer on its side.
  4. Carefully note the location of all cable connections on the system board. It will be necessary to reconnect them correctly after you install the new system board assembly.
    Important:
    Note the cable routing. It is important to route the cables the same way after you install the new system board.

  5. Remove the air baffle by squeezing the two tabs 1 together and pulling it out of the chassis.

    429824_a52.gif

  6. Remove any PCI adapter cards. See "Adapter removal and installation".
  7. Remove the lower drive cage by removing the thumb-screw and sliding the lower drive cage toward the rear of the computer.

    429824-2_a52.gif

  8. Disconnect the cables attached to the drives in the lower drive cage and set the drive cage to the side.
  9. Disconnect all cables connected to the system board.
  10. Remove screws 1 through 7.

    remove screws 1 - 7

  11. Slide the system board toward the front of the computer to disengage it from the mounting tabs and lift it out.
  12. Place the defective system board next to the new system board on a clean, flat surface.
  13. Remove all memory modules from the defective system board and install them in the same connector on the new system board. See "Memory removal and installation". Return here after installing the memory modules on the new system board.
  14. Release and pivot lever 1 upward. Remove the heat sink 2 from the system board by carefully lifting it up and off the mounting bracket. Place the heat sink on its side on a clean, flat surface so the thermal material on the bottom of the heat sink does not touch the surface and become contaminated.

    429824-4_a52.gif

  15. Release and pivot locking lever 2 securing the microprocessor 1, then pivot the microprocessor retainer 3 until it is open.

    429824-5_a52.gif

  16. Using the vacuum pen 1, remove the microprocessor from the system board socket by lifting it straight up and out of the socket.

    Important: Do not touch the gold contacts on the bottom of the microprocessor. If you must touch the microprocessor, touch only the sides.

    429824-6_a52.gif

    Notes:
    a. Note the orientation of the notches 1 on the microprocessor. This is important when reinstalling the microprocessor on the new system board.

    429824-7_a52.gif

    b. Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible.

  17. On the new system board, release and pivot the locking lever, then pivot the microprocessor retainer until it is open.

    Note: There will be a black plastic cover on the retainer to protect the microprocessor socket. As you close the microprocessor retainer, remove the black plastic cover. Place the black plastic cover on the microprocessor retainer of the defective system board.
  18. Position the microprocessor so that the notches on the microprocessor are aligned with the tabs in the microprocessor socket.

    Important:
    To avoid damaging the microprocessor contacts, do not tilt the microprocessor when installing it into the socket.

  19. Using the vacuum pen 1, lower the microprocessor straight down into the microprocessor socket.

    429824-8_a52.gif

  20. Pivot the microprocessor retainer 3 to the closed position and rotate the locking lever 2 to secure the microprocessor 1. Make sure the locking lever is engaged with the retainer tab when securing the microprocessor.

    429824-9_a52.gif

  21. Align the beveled corners of the heat sink and the mounting bracket. Then position the heat sink 2 on the heat sink mounting bracket. Lower the lever 1 to secure the heat sink.

    429824-10_a52.gif

  22. Install the new system board assembly into the computer chassis by aligning the four slots in the metal plate on the bottom of the system board with the tabs in the chassis. Then slide the system board toward the rear of the chassis.

    429824-11_a52.jpg

    Important: Make sure to correctly align the metal plate on the bottom of the system board with the tabs in the chassis. Otherwise, the system board might be damaged when you install the screws.

  23. Align the seven screw holes, and install the screws.

    Note:
    Use only the screws provided by Lenovo.

  24. Reinstall all adapter cards. See "Adapter removal and installation".
  25. Reconnect all cables that were disconnected from the system board. Make sure all cables are routed correctly.
  26. Reinstall the lower drive cage and secure it with the thumb screw.
  27. Reconnect the signal and power cables to the drives in the lower drive cage.
  28. Reinstall the air baffle.
  29. Go to" Completing the installation".
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