IBM N51 Series User Manual

Beep Symptoms
Symptom/Error FRU/Action
Continuous beep. 1. System Board
Repeating short beeps.
(See “External
Keyboard/Auxiliary Input
Device Checkout” on
page 465 before replacing
any FRUs.)
1. Keyboard
2. Keyboard Control Card
3. System Board
One long and one short
beep.
1. System Board
One long and two short
beeps.
1. System Board
One short beep and a
blank, unreadable, or
flashing display with no
external display attached.
1. LCD Panel
2. LCD Inverter
3. System Board
4. LCD Cable
One short beep and
Diskette Prompt or a
program load from the hard
disk or unable to read
diskette.
1. Diskette Drive
2. System Board
3. Diskette Drive Cable
Two short beeps and a
blank display.
1. System Board
Miscellaneous Symptoms
Symptom/Error FRU/Action
No beep and a blank or
unreadable display during
POST.
(See “Power Systems
Checkout” on page 78
before replacing any FRUs.)
1. System Board
2. Any option or device
3. Power source when
failing
4. Voltage Converter
5. Speaker
No beep with a blinking
cursor.
1. System Board
2. Communications
Cartridge
No beep with a normal
display during POST.
1. Speaker
2. I/O Panel Assembly
3. System Board
4. Keyboard Control Card
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.
1. LCD Inverter
2. LCD Panel
3. System Board
LCD unreadable or
distorted. (If an external
display is OK, replace
system board last.)
1. LCD Panel
2. System board
3. LCD Inverter
4. LCD Cable
Model N51 (8551) 91

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English