Delta THINKPAD R40 Technical Information download pdf (Page 62)

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.

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.

Reset

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.

Reset

all

LCD

connectors.

3.

LCD

assembly.

4.

System

board.

Horizontal

or

vertical

lines

displayed

on

LCD.

LCD

assembly.

Symptom-to-FRU

index

58

ThinkPad

R40

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 183 184

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