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For access, remove these FRUs in order:
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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.
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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] CPU
[b] PCH (Platform Controller Hub)
[c] GPU (Graphic Processing Unit): Discrete graphics chip
Note: GPU ([d]) is only for the Discrete Graphics models. Integrated Graphics models do not have GPU on the system board.
For models with a discrete thermal module:
For models with an intergrated thermal module:
| Step |
Screw (quantity) |
Color
|
Torque |
| 1 |
M2 × 6 mm, wafer-head, nylon-coated (2) |
Black |
0.181 Nm (1.85 kgfcm) |
When installing: Make sure that the connector is attached firmly to the system board.
When installing:
- Make sure that the cables are attached to the cable guides firmly.
- Make sure that you route the cables correctly and you tape up the cables in the proper positions as shown in the following figure.
- When you route the cables, make sure that they are not subjected to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken.
Loosen the screws [2], but do not remove them.
Note: Different models might have different numbers of screws in step [2]
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 shown in the following figures. 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 rubbers marked [b].
For models with a discrete fan assembly
For models with an intergrated fan assembly
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