IBM N51 Series User Manual

Symptom/Error FRU/Action
LCD cannot be turned on or
off.
1. LCD Inverter
2. System Board
3. LCD Cable
Blank screen, or extra
horizontal or vertical line(s)
displayed on upper or lower
half of the LCD.
1. LCD Panel
2. System Board
3. LCD Cable
Computer status indicator is
incorrectly blinking or stays
on.
1. System Board
2. Related Device
Computer status indicator
stays off, but the POST
ends without an error.
1. I/O Panel Assembly
2. System Board
3. Related Device
Suspend light comes on
after POST. an error.
1. Reseat voltage
regulator cables
2. Voltage Regulator
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
Keyboard does not work. 1. Keyboard Control
Card
2. Numeric Keypad
3. System Board
One or more keys do not
work.
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
1. Keyboard
2. Numeric Keypad if
installed
3. Keyboard Control Card
External display problems.
(See “External Display
Self-Test” on page 464
before replacing any FRUs.)
1. External Display
2. System Board
3. I/O Panel Assembly
Incorrect memory size
during POST.
(See “Memory Checkout” on
page 77 before replacing
any FRUs.)
1. System Board
2. Memory Module Kit
Computer hang or
Intermittent hang.
(See “Undetermined
Problem” on page 94 before
replacing any FRUs.)
1. System Board
2. Hard Disk Drive Cable
3. Hard Disk Drive
4. Replace the last device
being tested
5. Voltage Converter
The computer goes into
suspend mode after the
POST.
1. System Board
2. Voltage Converter
3. Lid Switch
4. Keyboard Control Card
92 IBM Mobile Systems HMM - Volume 1

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English