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 Active Protection System™.
Note: If the test shows that Active Protection System 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 a corrugated conductive surface.
After replacing the system board, run PC-Doctor for DOS to make sure that hard disk drive Active Protection System 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, disable the battery pack first. Refer to “1000 Disabling the battery pack in the UEFI BIOS” for detailed instructions.
Then remove these FRUs in order:
- Please refer to “1010 Hard disk drive and solid state drive” for detailed instruction.
- Please refer to “1020 Keyboard” for detailed instruction.
- Please refer to “1030 DIMM” for detailed instruction.
- Please refer to “1040 Backup battery” for detailed instruction.
- Please refer to “1050 PCI Express Mini Card for wireless LAN/WiMAX” for detailed instruction.
- Please refer to “1060 PCI Express Mini Card for wireless WAN” for detailed instruction.
- Please refer to “1080 Keyboard bezel assembly with fingerprint reader and audio sub card ” for detailed instruction.
- Please refer to “1110 Fan assembly” for detailed instruction.
- Please refer to “1120 I/O board” for detailed instruction.
- Please refer to “1130 Speaker assembly” for detailed instruction.
- Please refer to “1140 Bluetooth daughter card and bluetooth sub card” for detailed instruction.
Removal steps of system board and base cover assembly
The following components soldered on the system board are extremely sensitive. When you service the system board, avoid any kind of rough handling.
[a] Accelerometer chip for the HDD Active Protection System
[b] Platform Controller Hub (PCH)
Removal steps of system board and base cover assembly (continued)
||M2 x 2.5mm (2)
Removal steps of Bluetooth daughter card and Bluetooth sub card (continued)
- Make sure that the fan connector is attached firmly.
- Make sure that the DC-in connector is attached to the system board firmly.
- Make sure that the rubbers [a] are attached on the system board when you install a new system board.
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 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.
 MAC address label
 Windows Certificate of Authentication label (COA)
 Non-encryption label (for non-TPM model) or Rating label (only for Indonesia)
 Asset tag
 IMEI BARCODE label for Ericsson F5521gw
 IMEI BARCODE label for Gobi3000
 SIM ICCID label
 Wireless label for special bid
 TW WWAN label
 ISRAEL label
 SIRIM label
 Wireless card label (only for Brazil)
 China 3G WWAN label
 Bluetooth label (only for Brazil)
 Brazil WWAN label
 Serial No. label
 System label
 FCC label
For some models, you need to apply one or two FCC labels. Check the old base cover; if it has two FCC labels, apply both to the new base cover.
For the location of each label, refer to the following figure: