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System board assembly removal and installation - ThinkPad SL400, SL500

Important notices for handling the system board:

When handling the system board, bear the following in mind.

  • The system board has an accelerometer, which can be broken by applying several thousands of G-forces.

    Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject the accelerometer to as much as 6,000 G’s of shock.
  • Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
  • If a system board is dropped, you must test it, using PC-Doctor for DOS, to make sure that the HDD Active Protection still functions (see below).

    Note: If the test shows that HDD Active Protection is not functioning, be sure to document the drop in any reject report, and replace the system board.
  • Avoid rough handling of any kind.
  • At every point in the process, be sure not to drop or stack the system board.
  • If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or conductive corrugated material.

After replacing the system board, run PC-Doctor for DOS to make sure that HDD Active Protection still functions. The procedure is as follows:

  1. Place the computer on a horizontal surface.
  2. Run Diagnostics --> ThinkPad Devices --> HDD Active Protection Test.

Attention: Do not apply physical shock to the computer while the test is running.

For access, remove these FRUs in order:

  1. Battery.
  2. Optical drive.
  3. Hard disk drive cover, hard disk drive
  4. DIMM slot cover.
  5. DIMM.
  6. PCI Express Mini Card for wireless LAN/WiMAX
  7. PCI Express Mini Card for wireless WAN
  8. Thermal door.
  9. Fan assembly
  10. CPU thermal module
  11. CPU
  12. Palm rest
  13. Bluetooth daughter card
  14. Intel Turbo Memory
  15. Backup battery
  16. Keyboard
  17. Top case sub assembly
  18. LCD unit.
  19. Frame L
  20. SATA-ODD

Following components soldered on the top side of the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.

(a) ICH (I/O Controller Hub)
Video chip
(d) MCH (Memory Controller Hub)

Note: (c) is only for the models with the VGA system board.



Step Screw (quantity) Color Torque
1 M2 × 4 mm, wafer-head, nylon-coated (2) Silver 0.167 Nm(1.7 kgfcm)
2 M2 × 7 mm, wafer-head, nylon-coated (2) Black 0.167 Nm(1.7 kgfcm)



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Document ID : PD009525
Legacy Document ID : MIGR-71522
Last Updated :
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