Lenovo T400S LCD-related symptoms, Reseat the LCD connectors, See important note for LCD-related

LCD-related symptoms

Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.

If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.

Notes:

vThis policy applies to all ThinkPad Notebooks purchased on 1 January, 2008 or later.

vLenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any replacement LCD will have zero pixel defects.

vOne pixel consists of R, G, B sub-pixels.

Table 6. LCD-related symptoms

Symptom or error		FRU or action, in sequence
No beep, power-on indicator on, and a		System board.
blank LCD during POST.
v LCD backlight not working.		1.	Reseat the LCD connectors.
v	LCD too dark.	2.	LCD assembly.
v LCD brightness cannot be adjusted.		3.	System board.
v LCD contrast cannot be adjusted.
v	LCD screen unreadable.	1.	See important note for “LCD-related
v	Characters missing pixels.		symptoms.”
v	Screen abnormal.	2.	Reseat all LCD connectors.
v	Wrong color displayed.	3.	LCD assembly.
		4.	System board.
Horizontal or vertical lines displayed on		LCD assembly.
LCD.

68ThinkPad T400s, T410s, and T410si Hardware Maintenance Manual