![background image](http://html.mh-extra.com/html/ibm/thinkpad-t400s/thinkpad-t400s_hardware-maintenance-manual_607485065.webp)
5. Determine whether the problem has been solved.
6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
Chapter 4
.
Related service information
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Summary of Contents for THINKPAD T400S
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