Lcd-Related Symptoms - Lenovo ThinkPad X41 Tablet MT 1866 Hardware Maintenance Manual

Symptom-to-FRU index

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 XGA: 8 or more bright dots, 8 or more dark dots,
or a total of 9 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.
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MT1866/1867/1869
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.