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