IBM N51 Series User Manual

Miscellaneous Symptoms
Symptom / Error FRU / Action
No beep, Power-on LED not
lit, and a blank LCD during
POST.
(See “Power Systems
Checkout” on page 290
before replacing any FRUs.)
1. System Board
2. DC/DC Card
3. Power source when
failing
No beep, Power-on LED lit,
and a blank LCD during
POST.
(See “Power Systems
Checkout” on page 290
before replacing any FRUs.)
1. System Board
2. Modem Card
No beep during POST but
computer runs OK.
1. System Board
(Speaker)
LCD screen unreadable or
characters missing pels.
1. LCD Assembly
2. System Board
One or more keys do not
work.
1. Keyboard
2. System Board
Computer does not respond
to Pen input.
1. Pen
2. LCD Assembly
3. System Board
LCD backlight not
functioning.
1. Inverter Card
2. LCD Assembly
3. Switch and LED Card
4. System Board
LCD backlight intensity not
adjustable.
1. LCD Assembly
2. Switch and LED Card
3. System Board
LCD contrast not adjustable. 1. LCD Assembly
2. System Board
3. Switch and LED Card
System hang or intermittent
hang.
(See “Undetermined
Problems” on page 301
before replacing any FRUs.)
1. Press Reset Button
2. System Board
3. Operating System
The computer does not
suspend or resume.
1. System Board
The computer does not
power off.
1. Press Reset Button
2. System Board
Real-time clock inaccurate. 1. Backup Battery
2. System Board
Printer problems.
(See “Printer Checkout” on
page 468.)
1. System Board
2. Parallel Port Device
Cable
Serial or parallel port device
problems.
1. Device
2. Device Cable
3. System Board
LED incorrectly remains off,
but computer runs OK.
1. Switch and LED Card
2. System Board
300 IBM Mobile Systems HMM - Volume 1

IBM N51 Series Specifications

General

Brand	IBM
Model	N51 Series
Category	Laptop
Language	English