Lenovo ThinkPad A31p ThinkPad A30/p, A31/p Hardware Maintenance Manual (Septem - Page 62

LCD-related symptoms, or a total of 9 or more bright and dark dots.

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Symptom-to-FRU index 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 XGA: 8 or more bright dots, 8 or more dark dots, or a total of 9 or more bright and dark dots. v SXGA+: 11 or more bright dots, 13 or more dark dots, or a total of 16 or more bright and dark dots. v UXGA: 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 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. 58 MT 2652/2653/2654

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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
XGA:
8 or more bright dots, 8 or more dark dots,
or a total of 9 or more bright and dark dots.
v
SXGA+:
11 or more bright dots, 13 or more dark
dots, or a total of 16 or more bright and dark
dots.
v
UXGA:
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
FRU or action, in sequence
No beep, power-on indicator
on, and a blank LCD during
POST.
System board
.
v
LCD backlight not working.
v
LCD too dark.
v
LCD brightness cannot be
adjusted.
1.
Reseat the LCD
connectors
.
2.
LCD assembly.
3.
System board.
v
LCD screen unreadable.
v
Characters missing pixels.
v
Screen abnormal.
v
Wrong color displayed.
1.
See important note for
“LCD-related symptoms.”
2.
Reseat all LCD connectors.
3.
LCD assembly.
4.
System board.
Horizontal or vertical lines
displayed on LCD.
LCD assembly
.
Symptom-to-FRU index
58
MT 2652/2653/2654