TP 755CE/CSE/CV/CX - Miscellanous Symptoms

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Service Hints & Tips

Document ID: GSMH-3BKM4X

TP 755CE/CSE/CV/CX - Miscellanous Symptoms

Applicable to: World-Wide

LCD Related Symptoms:
The TFT LCD for the notebook computer contains 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, but excessive pixel problems can cause
viewing concerns.

The LCD should be replaced if the number of dots satisfies the following condition.

The number of missing, discolored, or lighted dots in any colored background is 21 or more.

Note:
For Model 755CV, see also "Model 755CV Symptoms" for LCD related symptoms.

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

- 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 note for "LCD Related Symptoms".
2. Reseat all LCD connectors
3. LCD Assembly
4. System Board
5. Interposer Card

LCD has extra horizontal or vertical lines displayed.

LCD Assembly

Model 755CV Symptoms:

Symptom/Error

FRU/Action

The screen is black when the LCD cover is installed.

1. Verify that the LCD cover is firmly installed on the LCD.
2. Diagnose the LCD assembly by following "LCD Related Symptoms".

The LCD is wavy when the computer is placed on the overhead projector.

Some overhead projectors interfere with the LCD of the computer. Use another overhead projector.

The LCD stays on even when the LCD cover is removed.

Make sure that the switch on the rear of the LCD is not stuck. If it is stuck, release it with the tip of a ball-point pen.

- Abnormal screen
- Uneven color on the screen
- Spot on the screen

1. Check that the white film on the LCD cover is clean. Gently wipe the film with a dry, soft cloth, such as a lens cleaner.
2. LCD Cover
3. Diagnose the LCD assembly by following "LCD Related Symptoms".

Note:
The customer may be responsible for repair costs if the LCD cover was
damaged due to misuse, excessive force, scratch, or liquid spilled by the customer.

The computer has an intermittent problem when you use it on the overhead projector.

Problem such as high environmental temperature might be the cause. Use the stand supplied with the computer.

The remote control does not work.

1. Check that two AAA alkaline batteries are installed in the remote control.
2. Check that two AAA alkaline batteries in the remote control are at their normal energy (voltage) level.
3. Enable the IR port of the computer with the ThinkPad Features program. (Disable the serial port at this time.)
4. Refer to the trouble shooting section in the Help menu of the Mind Path
Presentation F/X program. Set up this program following the guide.
5. If the preceding items are correct, the radiation from the light of the overhead projector might be interfering the IR port of the computer. Disable the rear IR port of the computer, and use the remote control with the front IR port.
6. Use the remote control with another computer, which IR port works normally. If the remote control does not work, the remote control is not working properly.

If there is still a problem, refer to "Infrared Related Symptoms".

Keyboard/TrackPoint III 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 III does not work.

1. Go to "TrackPoint III Checkout".
2. Keyboard
3. Interposer Card
4. System Board

Pointer moves automatically or does not work correctly.

1. See "TrackPoint III 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

Search Keywords

Hint Category

Hardware Maintenance Information

Date Created

19-11-96

Last Updated

19-08-98

Revision Date

18-08-99

Brand

IBM ThinkPad

Product Family

ThinkPad 755CE/CSE, ThinkPad 755CX, ThinkPad 755CV, ThinkPad 755CD, ThinkPad 755CDV

Machine Type

9545

Model

Various

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
- 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 note for "LCD Related Symptoms". 2. Reseat all LCD connectors 3. LCD Assembly 4. System Board 5. Interposer Card
LCD has extra horizontal or vertical lines displayed.	LCD Assembly

Symptom/Error	FRU/Action
The screen is black when the LCD cover is installed.	1. Verify that the LCD cover is firmly installed on the LCD. 2. Diagnose the LCD assembly by following "LCD Related Symptoms".
The LCD is wavy when the computer is placed on the overhead projector.	Some overhead projectors interfere with the LCD of the computer. Use another overhead projector.
The LCD stays on even when the LCD cover is removed.	Make sure that the switch on the rear of the LCD is not stuck. If it is stuck, release it with the tip of a ball-point pen.
- Abnormal screen - Uneven color on the screen - Spot on the screen	1. Check that the white film on the LCD cover is clean. Gently wipe the film with a dry, soft cloth, such as a lens cleaner. 2. LCD Cover 3. Diagnose the LCD assembly by following "LCD Related Symptoms". Note: The customer may be responsible for repair costs if the LCD cover was damaged due to misuse, excessive force, scratch, or liquid spilled by the customer.
The computer has an intermittent problem when you use it on the overhead projector.	Problem such as high environmental temperature might be the cause. Use the stand supplied with the computer.
The remote control does not work.	1. Check that two AAA alkaline batteries are installed in the remote control. 2. Check that two AAA alkaline batteries in the remote control are at their normal energy (voltage) level. 3. Enable the IR port of the computer with the ThinkPad Features program. (Disable the serial port at this time.) 4. Refer to the trouble shooting section in the Help menu of the Mind Path Presentation F/X program. Set up this program following the guide. 5. If the preceding items are correct, the radiation from the light of the overhead projector might be interfering the IR port of the computer. Disable the rear IR port of the computer, and use the remote control with the front IR port. 6. Use the remote control with another computer, which IR port works normally. If the remote control does not work, the remote control is not working properly. If there is still a problem, refer to "Infrared 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 III does not work.	1. Go to "TrackPoint III Checkout". 2. Keyboard 3. Interposer Card 4. System Board
Pointer moves automatically or does not work correctly.	1. See "TrackPoint III 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

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	19-11-96
	Last Updated	19-08-98
	Revision Date	18-08-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad 755CE/CSE, ThinkPad 755CX, ThinkPad 755CV, ThinkPad 755CD, ThinkPad 755CDV
	Machine Type	9545
	Model	Various
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes