IBM N51 Series User Manual

Symptom/Error FRU/Action
A no beep and the
computer hangs after
displaying memory count.
1. System Board
2. Communications
Cartridge
3. Hard Disk Drive
LCD too dark, unable to
adjust contrast or
brightness.
(See “CL57 LCD FRU
Replacement Notice” on
page 133 before replacing
any FRUs.)
1. LCD Panel
2. Regulator
3. Voltage Converter
LCD unreadable or illegible.
(See “CL57 LCD FRU
Replacement Notice” on
page 133 before replacing
any FRUs.)
1. LCD Panel
2. Display Control Card
3. LCD Cable
Missing or discolored dots
on the LCD panel.
1. See “CL57 LCD FRU
Replacement Notice”
on page 133.
Unable to turn the LCD on
and off.
1. Regulator
2. Voltage Converter
3. LCD Cable
Blank screen, or extra
horizontal or vertical line(s)
displayed on upper or lower
half of the LCD.
(See “CL57 LCD FRU
Replacement Notice” on
page 133 before replacing
any FRUs.)
1. LCD Panel
2. Display Control Card
3. LCD Cable
Four battery indicators are
blinking.
Battery ID 1
Battery Status 1
Battery ID 2
Battery Status 2
1. Voltage Converter
2. System Board
System status indicator is
incorrectly blinking or stays
on.
1. Related Device
2. System Board
3. Indicator Card
System status indicator
stays off, but the POST
ends without an error.
1. Indicator Card
2. System Board
3. Related Device
Reference Diskette does not
work. (Try another
Reference Diskette or any
bootable diskette before
replacing FRUs. Ensure all
correct level drivers are
loaded.)
1. Diskette Drive
2. System Board
3. Diskette Drive Cable
4. Reference Diskette
128 IBM Mobile Systems HMM - Volume 1

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English