This is a maintenance manual that introduces the maintenance methods of ThinkPad T400s
This manual offers comprehensive service and reference information for the ThinkPad T400s, including safety instructions, important service notices, and detailed procedures for diagnosing and repairing the notebook. It emphasizes reading the safety information on page 1 and the important service information on page 39 before any work.
The document covers FRU replacement strategies, power system checkout, password recovery, diagnostic tools such as PC‑Doctor, specifications, and a complete parts list with part numbers. It is intended for trained service personnel who need to troubleshoot and maintain the T400s laptop.
The manual includes a "Power‑on password" section that describes the steps to remove the password.
You should read the safety information on page 1 and the important service information on page 39 before servicing the notebook.
The parts list at the end of the manual lists the LCD unit with part number 45M2271.