Lenovo THINKPAD T41/T41P Hardware Maintenance Manual page 144

Removing and replacing a FRU
v System board without the security chip (bottom view)
Begin by checking the FRU number of the system board,
and be sure to use the correct system board for the
computer. For the FRU numbers, see "Parts list" on page
190.
Important
If the ThinkPad computer you are servicing has a
security chip, bear the following in mind:
v Do not remove the security chip from the
system board. If the security chip is removed by
accident, reinstall it on the system board
immediately. Make sure that it is firmly fixed on
the system board and does not move easily.
v The security chip cannot be used with any other
system board.
v The system board cannot be used with any other
security chip.
v The system board cannot be used without the
security chip.
v If you return a defective system board, you must
check whether the security chip is embedded. If it
is not, the board may not be covered under
warranty.
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T40/T40p, T41/T41p, T42/T42p