TP 355/360/370/750/755C/CS - Various Related Symptoms

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Service Hints & Tips

Document ID: GSMH-3BCH5S

TP 355/360/370/750/755C/CS - Various Related Symptoms

Applicable to: World-Wide

LCD Related Symptoms:
The TFT LCD of the notebook computers contain over 921 000 thin film transistors (TFTs). A small number of missing, discolored or lighted dots (on all the time) is characteristic of TFT LCD technology. Excessive pixel problems can cause viewing concerns. The LCD should be replaced if the number of missing or discolored, or lighted dots in any colored background is 21 or more.

Symptom/Error

FRU/Action

No beep, power-on indicator on, and a blank LCD during POST.

1. System Board
2. DC/DC Card
3. Processor Card (370C, 750Ce, 755C, and 755Cs)

LCD backlight not working, or
LCD too dark, or
LCD brightness cannot be adjusted, or
LCD contrast cannot be adjusted.

1. Reseat the LCD connectors.
2. LCD Assembly
3. Interposer Card
4. DC/DC Card

LCD screen unreadable, or
Characters missing pels, or
Screen abnormal, or
Wrong color displayed.

1. See the preceding important note.
2. Reseat the all LCD connectors
3. LCD Assembly
4. System Board
5. Interposer Card

LCD has extra horizontal or vertical lines displayed.

1. LCD Assembly

Keyboard/TrackPoint II Related Symptoms:

Symptom/Error

FRU/Action

Keyboard (one or more keys) does not work.

1. Reseat the three keyboard cables.
2. Keyboard
3. Interposer Card
4. System Board

TrackPoint II does not work.

1. Go to 'TrackPoint II checkout—.
2. Keyboard
3. Interposer Card
4. System Board

Pointer moves automatically or does not work correctly.

1. See 'TrackPoint II checkout—.

Indicator Related Symptoms:

Symptom/Error

FRU/Action

Indicator incorrectly remains off or on, but system runs correctly.

1. Reseat the status indicator cable.
2. Status Indicator
3. Interposer Card
4. System Board

Battery power status indicator blinks from green, yellow, to orange.

1. Check that a correct battery is installed.
2. Set the battery storage switch to ON.
3. Battery Pack
4. DC/DC Card
5. System Board

Power Related Symptoms:

Symptom/Error

FRU/Action

Power shut down during operation.

1. Go to 'Power Systems Checkout— on .
2. Battery Pack
3. Remove the battery pack and let it cool for two hours.
4. DC/DC Card
5. Power sources

The system will not power-off.
(See 'Reset Pushbutton—.)

1. Press the Reset push button.
2. System Board

Function/Audio Related Symptoms:

Symptom/Error

FRU/Action

The system will not suspend or resume by opening or closing the keyboard.

1. Go to 'Suspend Mode— and check that the computer can enter suspend mode.
2. Go to Easy-Setup screen and press Fn+ 4. If the computer enters suspend
mode, suspect that the application program is defective.
3. DC/DC Card
4. Interposer Card
5. System Board

The system will not suspend or resume by opening or closing the LCD.

1. Go to 'Suspend Mode— and that check that the computer can enter suspend mode.
2. Go to Easy-Setup screen and press Fn+ 4. If the computer enter suspend mode, suspect that the application program is defective.
3. Interposer Card
4. DC/DC Card
5. System Board

Battery Fuel-Gauge does not go higher than 90%.

1. Go to 'Checking the Battery Pack— and see the note.

Audio problems.

1. Run the Audio Test.
2. Audio Card

Memory count (size) appears differently from actual size.

1. Go to 'Memory Checkout—.

System configuration does not match the installed devices.

1. Go to 'Checking the Installed Devices List—.

System hangs intermittently.

1. Go to 'Intermittent Problems.—

Peripheral Device Related Symptoms:

Symptom/Error

FRU/Action

External display does not work correctly.

1. See 'External Display Self-Test— in 'Common Devices Checkout— section.

Printer problems.

1. Run Printer Self-test.
2. System Board
3. Parallel Port Device
4. Cable

Serial or parallel port device problems.

1. Device
2. Device Cable
3. System Board

Search Keywords

Hint Category

Hardware Maintenance Information

Date Created

12-11-96

Last Updated

29-04-99

Revision Date

06-05-2000

Brand

IBM ThinkPad

Product Family

ThinkPad 355, ThinkPad 360, ThinkPad 370, ThinkPad 750, ThinkPad 755C/CS

Machine Type

2619, 2620, 9545

Model

All

TypeModel

Retain Tip (if applicable)

N/A

Reverse Doclinks
and Admin Purposes

Symptom/Error	FRU/Action
No beep, power-on indicator on, and a blank LCD during POST.	1. System Board 2. DC/DC Card 3. Processor Card (370C, 750Ce, 755C, and 755Cs)
LCD backlight not working, or LCD too dark, or LCD brightness cannot be adjusted, or LCD contrast cannot be adjusted.	1. Reseat the LCD connectors. 2. LCD Assembly 3. Interposer Card 4. DC/DC Card
LCD screen unreadable, or Characters missing pels, or Screen abnormal, or Wrong color displayed.	1. See the preceding important note. 2. Reseat the all LCD connectors 3. LCD Assembly 4. System Board 5. Interposer Card
LCD has extra horizontal or vertical lines displayed.	1. LCD Assembly

Symptom/Error	FRU/Action
Keyboard (one or more keys) does not work.	1. Reseat the three keyboard cables. 2. Keyboard 3. Interposer Card 4. System Board
TrackPoint II does not work.	1. Go to 'TrackPoint II checkout—. 2. Keyboard 3. Interposer Card 4. System Board
Pointer moves automatically or does not work correctly.	1. See 'TrackPoint II checkout—.

Symptom/Error	FRU/Action
Indicator incorrectly remains off or on, but system runs correctly.	1. Reseat the status indicator cable. 2. Status Indicator 3. Interposer Card 4. System Board
Battery power status indicator blinks from green, yellow, to orange.	1. Check that a correct battery is installed. 2. Set the battery storage switch to ON. 3. Battery Pack 4. DC/DC Card 5. System Board

Symptom/Error	FRU/Action
Power shut down during operation.	1. Go to 'Power Systems Checkout— on . 2. Battery Pack 3. Remove the battery pack and let it cool for two hours. 4. DC/DC Card 5. Power sources
The system will not power-off. (See 'Reset Pushbutton—.)	1. Press the Reset push button. 2. System Board

Symptom/Error	FRU/Action
The system will not suspend or resume by opening or closing the keyboard.	1. Go to 'Suspend Mode— and check that the computer can enter suspend mode. 2. Go to Easy-Setup screen and press Fn+ 4. If the computer enters suspend mode, suspect that the application program is defective. 3. DC/DC Card 4. Interposer Card 5. System Board
The system will not suspend or resume by opening or closing the LCD.	1. Go to 'Suspend Mode— and that check that the computer can enter suspend mode. 2. Go to Easy-Setup screen and press Fn+ 4. If the computer enter suspend mode, suspect that the application program is defective. 3. Interposer Card 4. DC/DC Card 5. System Board
Battery Fuel-Gauge does not go higher than 90%.	1. Go to 'Checking the Battery Pack— and see the note.
Audio problems.	1. Run the Audio Test. 2. Audio Card
Memory count (size) appears differently from actual size.	1. Go to 'Memory Checkout—.
System configuration does not match the installed devices.	1. Go to 'Checking the Installed Devices List—.
System hangs intermittently.	1. Go to 'Intermittent Problems.—

Symptom/Error	FRU/Action
External display does not work correctly.	1. See 'External Display Self-Test— in 'Common Devices Checkout— section.
Printer problems.	1. Run Printer Self-test. 2. System Board 3. Parallel Port Device 4. Cable
Serial or parallel port device problems.	1. Device 2. Device Cable 3. System Board

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	12-11-96
	Last Updated	29-04-99
	Revision Date	06-05-2000
	Brand	IBM ThinkPad
	Product Family	ThinkPad 355, ThinkPad 360, ThinkPad 370, ThinkPad 750, ThinkPad 755C/CS
	Machine Type	2619, 2620, 9545
	Model	All
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes