Lcd-Related Symptoms - Lenovo 64585KU Hardware Maintenance Manual

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. The LCD should be replaced if the
number of missing, discolored, or lighted dots in any background is:
v WXGA: 8 or more bright dots, 8 or more dark dots, or a total of 9 or more
bright and dark dots.
v WSXGA+: 11 or more bright dots, 13 or more dark dots, or a total of 16 or
more bright and dark dots.
v WUXGA: 11 or more bright dots, 16 or more dark dots, or a total of 16 or
more bright and dark dots.
Note: A bright dot means a pixel is always on (white or color.) A dark dot
means a pixel is always off (black color.)
Symptom or error
No beep, power-on indicator on, and a
blank LCD during POST.
v LCD backlight not working.
v LCD too dark.
v LCD brightness cannot be adjusted.
v LCD contrast cannot be adjusted.
v LCD screen unreadable.
v Characters missing pixels.
v Screen abnormal.
v Wrong color displayed.
Horizontal or vertical lines displayed on
LCD.
Symptom-to-FRU index
FRU or action, in sequence
System board.
1. Reseat the LCD connectors.
2. LCD assembly.
3. System board.
1. See important note for "LCD-related
symptoms."
2. Reseat all LCD connectors.
3. LCD assembly.
4. System board.
LCD assembly.
ThinkPad T61 and T61p (15.4-inch widescreen)
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