Lcd-Related Symptoms - IBM ThinkPad A22e Hardware Maintenance Manual

LCD-related symptoms

Important
The TFT LCD for the notebook computer contains
many thin-film transistors (TFTs). 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 SVGA: 5 or more bright dots, 5 or more dark
dots, or a total of 9 or more bright and dark dots.
v XGA: 8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
Note: Bright dots means pixel is always on (white
or color.) Dark dots means 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.
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 A21e, A22e, i 1800
Symptom-to-FRU index
51