TP General - N51 Miscellaneous Symptoms

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TP General - N51 Miscellaneous Symptoms

Applicable to: World-Wide

Miscellaneous Symptoms:

Symptom/Error

FRU/Action

No beep and a blank or unreadable display during POST.
(See ¿Power Systems Checkout— 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

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 Auxillary Input Device Checkout' unknown -- before replacing any FRUs.)

1. Keyboard
2. Numeric Keypad if installed
3. Keyboard Control Card

External display problems.
(See -- 'External Dispaly Self-Test' -- before replacing any FRUs.)

1. External Display
2. System Board
3. I/O Panel Assembly

Incorrect memory size during POST.
(See ¿Memory Checkout— before replacing any FRUs.)

1. System Board
2. Memory Module Kit

Computer hang or Intermittent hang.
(See ¿Undetermined Problem— 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 Converte
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. I/O Panel Assembly

Real-time clock inaccurate. (See ¿Testing the Battery Pack— before replacing any FRUs.)

1. Backup Battery
2. System Board

Printer problems.

1. See -- 'Printer Checkout' --.

Serial or parallel port device problems.

1. Device
2. Cable
3. System Board
4. Serial Adapter
5. I/O Panel Assembly

Internal Data/Fax modem does not communicate with a remote modem or a fax.

1. See -- 'Fax/Modem Checkout' --.

Search Keywords

Hint Category

Hardware Maintenance Information

Date Created

10-12-96

Last Updated

01-05-98

Revision Date

28-04-99

Brand

IBM ThinkPad

Product Family

Notebook N51

Machine Type

8551

Model

Various

TypeModel

Retain Tip (if applicable)

N/A

Reverse Doclinks
and Admin Purposes

Symptom/Error	FRU/Action
No beep and a blank or unreadable display during POST. (See ¿Power Systems Checkout— 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
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 Auxillary Input Device Checkout' unknown -- before replacing any FRUs.)	1. Keyboard 2. Numeric Keypad if installed 3. Keyboard Control Card
External display problems. (See -- 'External Dispaly Self-Test' -- before replacing any FRUs.)	1. External Display 2. System Board 3. I/O Panel Assembly
Incorrect memory size during POST. (See ¿Memory Checkout— before replacing any FRUs.)	1. System Board 2. Memory Module Kit
Computer hang or Intermittent hang. (See ¿Undetermined Problem— 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 Converte 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. I/O Panel Assembly
Real-time clock inaccurate. (See ¿Testing the Battery Pack— before replacing any FRUs.)	1. Backup Battery 2. System Board
Printer problems.	1. See -- 'Printer Checkout' --.
Serial or parallel port device problems.	1. Device 2. Cable 3. System Board 4. Serial Adapter 5. I/O Panel Assembly
Internal Data/Fax modem does not communicate with a remote modem or a fax.	1. See -- 'Fax/Modem Checkout' --.

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	10-12-96
	Last Updated	01-05-98
	Revision Date	28-04-99
	Brand	IBM ThinkPad
	Product Family	Notebook N51
	Machine Type	8551
	Model	Various
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes