Lenovo THINKPAD T41/T41P Hardware Maintenance Manual page 143

Removing and replacing a FRU
Important notice for handling the system board in
ThinkPad T40 series:
There are two types of system board FRU for the
ThinkPad T40 series, as follows:
v System board with the security chip (bottom view)
Note: The security chip a is embedded on the
underside of the system board.
a
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ThinkPad T40/T40p, T41/T41p, T42/T42p Series