IBM 600X (MT 2646) manual LCD-related symptoms, 13.3, Modem-related symptoms, That Device

Symptom-to-FRU error messages

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 l

characteristic

of TFT LCD technology, but exces

pixel problems can cause viewing concerns. The L

should be replaced if the number of missing,

discolored, or

lighted

dots

in

any

background

Ÿ

XGA

(13.3"):

8

or

more

bright

dots, 8

or

mor

dark

dots,

or

a

total

of

9

or

more

bright

dots.

Symptom

or

error

FRU

or

action,

in

sequence

No beep, power-on

indicator1.System board

.

on,

and

a

blank

LCD

during

POST.

Ÿ

LCD

backlight

not

1. Reseat

the

LCD

working.

connectors.

Ÿ

LCD

too

dark.

2.

LCD assembly.

3.

System board.

Ÿ

LCD

brightness

cannot

be

adjusted.

Ÿ

LCD

contrast

cannot

be

adjusted.

Ÿ

LCD screen

1. See

important

note

unreadable.

for

“LCD-related

Ÿ

Characters missing

symptoms.”

pixels.

2.

Reseat

all LCD

Ÿ

Screen abnormal.

connectors.

Ÿ

Wrong

color

displayed.

3.

LCD assembly.

4.

System board.

Extra

horizontal

or

vertical1.LCD assembly

.

lines

are

displayed

on

the

LCD.

Modem-related symptoms

Symptom

or

error

FRU

or

action,

in

sequence

In

OS/2,

DOS,

or

Windows

Check

that

the

device

multimedia

programs,

no

driver

is

installed

sound

comes

from

the

correctly.

computer.

(Only system

beeps

are

heard

at

power-on.)

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