Lenovo 0768AFU User Manual - Page 46

LCD-related, symptoms

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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). 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. 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. 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. 40 MT 0689, 0768, and 0769

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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.
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.
v
LCD
contrast
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
40
MT
0689,
0768,
and
0769