IBM N51 Series User Manual

Symptom/Error FRU/Action
Keyboard does not work. 1. Keyboard Control
Card
2. Keyboard Cable
3. Numeric Keypad if
used
4. 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
3. Keyboard Control Card
External display problems.
(See “External Display
Self-Test” on page 464
before replacing any FRUs.)
1. External Display
2. Display Control Card
Incorrect memory size
during POST.
(See “Memory Checkout” on
page 115 before replacing
any FRUs.)
1. System Board
2. Memory Module
3. IC DRAM Card
Computer hang or
Intermittent hang.
(See “Undetermined
Problem” on page 130
before replacing any FRUs.)
1. System Board
2. Hard Disk Drive Cable
3. Hard Disk Drive
4. Replace the last device
being tested
5. Display Control Card
6. Memory Module
7. IC DRAM Card
8. Voltage Converter
The computer goes into
suspend mode after the
POST.
1. System Board
2. Voltage Converter
3. Lid Switch
4. Keyboard Control Card
The computer does not
suspend or resume.
1. System Board
2. Voltage Converter
3. Lid Switch
4. Keyboard Control Card
The computer does not
power off.
1. Voltage Converter
2. System Board
3. Indicator Card
Real-time clock inaccurate.
(See “Testing the Backup
Battery” on page 121 before
replacing any FRUs.)
1. Backup Battery
2. System Board
Printer problems. 1. See “Printer
Checkout” on
page 468.
Model CL57 (8554) 129

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English