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: - Place the computer on a horizontal surface.
- Run Diagnostics --> ThinkPad Devices --> HDD Active Protection Test.
Attention: Do not apply physical shock to the computer while the test is running.
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For access, remove these FRUs, in order: 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) | b | CPU | c | GMCH (Graphics Memory Controller Hub) | d | Accelerometer chip for the HDD Active Protection System™ |
Note: Step [2a] is only for ThinkPad T410s and T410si. |
| 1 | M2 x 3.5 mm, big-head, nylon-coated (3) | Black | 0.181 Nm (1.85 kgfcm) | | 2 | M2 x 6 mm, bind-head, nylon-coated (1) | Black | 0.181 Nm (1.85 kgfcm) | | 2a | M2 × 6 mm, bind-head, nylon-coated (2) | Black | 0.181 Nm (1.85 kgfcm) |
In step [4], remove the system board and fan assembly together from the base cover assembly. 
Note: The steps from [5] to [7] indicate the removal steps of fan assembly, and those from [8] to [11] indicate the ones of 34-mm ExpressCard slot frame. 
Note: Step [5a] is only for ThinkPad T410s and T410si. |
| 5 | M2 x 3.5 mm, big-head, nylon-coated (3) | Black | 0.181 Nm (1.85 kgfcm) | | 5a | M2 × 3.5 mm, big-head, nylon-coated (1) | Black | 0.181 Nm (1.85 kgfcm) |
Turn the system board over, and then disconnect the fan assembly from the system board. 
When installing: - Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the part marked [a] as in the following figure. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component. You need to peel the thin film off from the rubber [b].
For ThinkPad T400s: 
For ThinkPad T410s and T410si: 
- Make sure that the fan connector is attached firmly.
For ThinkPad T400s: 
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| 8 | M2 x 3 mm, small-head, nylon-coated (1) | Silver | 0.181 Nm (1.85 kgfcm) | | 9 | M2 x 5 mm, flat-head, nylon-coated (2) | Black | 0.181 Nm (1.85 kgfcm) |
For ThinkPad T410s and T410si: 
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| 8 | M2 x 3 mm, small-head, nylon-coated (1) | Silver | 0.181 Nm (1.85 kgfcm) | | 9 | M2 x 5 mm, flat-head, nylon-coated (2) | Black | 0.181 Nm (1.85 kgfcm) |
Turn the system board over, and then remove the 34-mm ExpressCard slot frame from the system board. 
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