|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. v 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:
- Remove battery.
- Remove PCI Express Mini Card for wireless LAN.
- Remove wireless USB adapter.
- Remove keyboard.
- Remove palm rest or palm rest with fingerprint reader.
- Remove keyboard bezel.
- Remove LCD assembly.
- 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) Security chip
(b) Accelerometer chip for the HDD Active Protection System™
(c) ICH (I/O Controller Hub)
(d) GMCH (Integrated video chip)
|1||M2 × 6 mm, bind-head, nylon-coated (1)||Black||0.167 Nm(1.7 kgfcm)|
|2||M2 × 3 mm, small-head, nylon-coated (1)||Silver||0.167 Nm(1.7 kgfcm)|
- In step (3), remove the system board and fan assembly together from the base cover assembly.
|4||M2 × 4 mm, bind-head, nylon-coated (3)||Black||0.167 Nm(1.7 kgfcm)|
Turn the system board over, and then disconnect the fan assembly from the system board.
- When installing: Make sure that the fan connector is attached to the system board firmly.
Application of the thermal grease
- 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.
|Note: Applying labels to the base cover |
The new base cover FRU is shipped with a kit containing labels of several kinds. When you replace the base cover, you need to apply the following labels:
 Product label
 Homologation label
Following labels need to be peeled off from the old base cover, and need to be put on the new base cover.
 SIRM label
 China modem label
 Wireless WAN LMA label
 Israel label
 Windows license label (COA)
 Blind sheet A
 Information label
 Wireless WAN IMEI label or wireless WAN ESN label
 Wireless WAN MAC address label
 MAC address label
 Serial number label
 SIM ICCID label
For some models, you also need to apply one or two FCC labels. Check the old base cover; if it has one or two FCC labels, find duplicates of them in the label kit and apply them to the new base cover.
For the location of each label, refer the following figure: