IBM ThinkPad 340 Series Hardware Maintenance Manual page 100

Symptom/Error
LCD screen unreadable or
characters missing pels.
LCD too dark, unable to
adjust contrast or
brightness.
LCD slightly dims when
changing to battery power.
LCD unreadable, illegible, or
distorted.
LCD cannot be powered-on
or off.
Blank screen, or extra
horizontal or vertical lines
displayed on upper or lower
half of the LCD with no
beep or one short beep.
System status indicator is
incorrectly blinking or stays
on.
System status indicator
stays off, but the POST
ends without an error.
No keys on the keyboard
work.
See "1080 Keyboard Unit"
on page 54.
Keypad problems.
One or more keys do not
work.
90
IBM Mobile Systems HMM
FRU/Action
1. See important note
for "LCD FRU
Replacement Notice"
on page 124.
2. LCD Assembly
3. System Board
1. LCD
2. Video Card
1. Normal operation
(Dimming of LCD
conserves battery
power.)
1. LCD
2. Video Card
3. System Board
1. Video Card
2. System Board
3. Voltage Converter
1. LCD
2. Video Card
3. System Board
1. System Board
2. Related Device
3. Indicator Assembly
1. System Board
2. Related Device
3. Indicator Assembly
1. Keyboard Control
Card
2. Keyboard
3. External Keyboard or
Numeric Keypad (if
attached)
4. System Board
1. Reseat cable
2. External Keypad
3. Keyboard Control Card
4. System Board
1. See "1080 Keyboard
Unit" on page 54
before replacing any
FRUs.
2. Keyboard
3. External Keyboard or
Numeric Keypad (if
attached)
4. Keyboard Control Card