1200 System Board Assembly - Lenovo ThinkPad L412 Hardware Maintenance Manual

Step Screw (quantity)
1
M2 × 3 mm, flat-head, nylon-coated (2)
2
M2 × 5 mm, flat-head, nylon-coated (3)

1200 System board assembly

• To identify the system board originally installed in your computer, go to PEW at the following web site:
http://www.lenovo.com/support/site.wss/document.do?lndocid=LOOK-WARNTY
Select Warranty Lookup. Input the machine type and the serial number. Use the system board listed on
PEW.
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 if several thousands of G-forces are applied.
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 if the system supports PC-Doctor
for DOS, to make sure that the HDD Active Protection System™ still functions.
Note: If the test shows that the HDD Active Protection System is not functioning, be sure to document the
drop in a 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.
If the system supports PC-Doctor for DOS, after replacing the system board, run PC-Doctor for DOS to
make sure that the HDD 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, remove these FRUs in order:
• 1010 Battery pack
• 1020 ExpressCard blank bezel and Media Card blank bezel
• 1030 Optical drive or travel cover
• 1040 Thermal cover
• 1050 Hard disk drive (HDD) assembly
• 1060 DIMM
• 1070 Fan assembly
• 1080 CPU
• 1090 SIM slot cover
• 1100 Wireless WAN slot cover and PCI Express Mini Card for wireless WAN
• 1110 Palm rest assembly with cables
Color Torque
Black 0.181 Nm
(1.85 kgfcm)
Black 0.181 Nm
(1.85 kgfcm)
.
Chapter 8 Removing and replacing a FRU
91