IBM manual 50

Symptom/Error	FRU/Action
No beep during POST, but	1. Turn	the	volume	up
system runs correctly.	and	listen	to	the
	speaker .
	2.	Speaker

LCD	Related		Symptoms
Symptom/Error						FRU/Action
Flicker						1. Do	not replace any
						FRUs.		In certain
						brightness/contrast
						settings,			screen flicker
						can		be	seen	because
						of		technical		limitations.
No	beep,		power-on indicator1.System Board
on,	and	a	blank	LCD	during
POST.
Ÿ	LCD	backlight		not		1. Reseat		the	LCD
	working					connector.			(See
Ÿ	LCD	too	dark			“1090		LCD Assembly”
						on	page 55.)
Ÿ	LCD	brightness		cannot
						2.	LCD Assembly
	be	adjusted

ŸLCD contrast cannot be adjusted.

Ÿ	LCD screen			1. Reseat		the	LCD
	unreadable,		or	connector.			(See
Ÿ	Characters missing			“1090		LCD Assembly”
	pels,	or		on	page 55.)
Ÿ	Screen abnormal, or			2.	System Board
Ÿ	Wrong characters			3.	LCD Assembly
	displayed.
LCD	has	extra	horizontal	or1.LCD Assembly
vertical		lines	displayed.

LCD

FRU

Replacement

Notice:

If missing or

discolored dots appear on the LCD, carefully read the

following

note

to

determine

whether

you

should

replace

the

LCD.

Ÿ

Do not replace

the

LCD

for defective pixels if dots

that are less than half the area of a pixel are

defective

(a

total

of

11

dots

are allowed).

Ÿ

The

LCD is

not

defective

if

the

dots

are

functional

but

are slightly different in color from the immediate,

surrounding

area

or

appear

as

a

“stain”.

ThinkPad 340x (IBM 2610)39