Symptom-to-FRU index
LCD-related symptoms
Im porta n t
The TFT LCD for the notebook computer contains
many thin-film transistors (TFTs). A small num ber 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:
• XG A: 8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
• SX GA+: 11 or more bright dots, 13 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 o r error FRU o r action, in sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
System bo ard.
• LCD backlight not working.
• LCD too dark.
• LCD brightness cannot be
adjusted.
• LCD contrast cannot be
adjusted.
1. Reset the LCD
co n nectors.
2. LCD assembly.
3. System board.
• LCD screen unreadable.
• Characters missing pixels.
• Screen abnormal.
• Wrong color displayed.
1. See im po rtant note for
“ LCD-related sym p tom s.”
2. Reset all LCD connectors.
3. LCD assembly.
4. System board.
Horizontal or vertical lines
displayed on LCD.
LCD asse m bly.
5 8 ThinkPad R40
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