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Service Hints & Tips

Document ID: GSMH-3BFL3S

TP 755CD/CDV - General Checkout

Applicable to: World-Wide

General Checkout:
Use the following procedure as a guide for computer problems. The diagnostic tests are intended to test only IBM products. Non-IBM products, prototype cards, or modified options can give false errors and invalid system responses.
1. Obtain the failing symptoms in as much detail as possible.
2. Verify the symptoms by attempting to recreate the failure by running the diagnostic test or by repeating the same operation.

Note:
To run the diagnostics, refer to How to Run the Diagnostics.

3. Use the following table with the verified symptom to determine which page to go to. Search the symptoms column and find the description that best matches your symptom; then go to the page shown in the Go to column.

Symptom	Go to
Power failure. (The power indicator does not go on or stay on.)	"Power Systems Checkout" on.
POST does not complete. No beeps or error codes are indicated.	"Symptom-to-FRU Index", and then use the No Beep Symptoms table.
POST beeps, but no error codes are displayed.	"Symptom-to-FRU Index", and then use the Beep Symptoms table.
POST detected an error and displayed numeric error codes.	"Symptom-to-FRU Index", and then use the Numeric Error Codes table.
The diagnostic test detected an error and displayed an FRU code.	"FRU Codes".
The configuration is not the same as the installed devices.	"Checking the Installed Devices List".
Other symptoms (such as LCD display problems).	"Symptom-to-FRU Index", and then use the other symptom table. table.
Symptoms cannot be recreated. (Intermittent problems.)	Use the customer reported symptoms and go to "Symptom-to-FRU Index" on.

Memory Checkout:
One of two types of memory cards can be used, IC DRAM card or DIMM card. See the following table for the total memory size available when they are installed.

IC DRAM	Displayed Value
0MB	7808KB
2MB	9856KB
4MB	11904KB
8MB	16000KB
16MB	24192KB

DIMM	Displayed Value
0MB	7808KB
4MB	11904KB
8MB	16000KB
12MB	20096KB
16MB	24192KB
20MB	28288KB
24MB	32384KB
32MB	40576KB

Memory errors might stop system operations, show error messages on the screen, or hang the system. The computer detects memory parity errors but does not correct them.

Use the following procedure to isolate memory problems.
1. Check whether or not the memory card use parity or non-parity.

Note:
Installing a non-parity memory card causes parity errors when parity checking is enabled. If the non-parity memory card is installed, disable the parity check through the Easy-Setup configuration screen.

2. Make sure that the memory card is fully seated in the connector.A loose connection can cause an error.
3. Power-off the computer and remove the IC DRAM card, or DIMM card from its slot (if installed).4
4. Press and hold the F1 key; then power-on the computer. Hold the F1 key down until the Easy-Setup screen appears.
5. Select Test and press enter.
6. Select Memory and press enter to run the memory test on base memory. If an error appears, replace the memory card.
7. Power-off the computer and reinstall the IC DRAM card or DIMM card; then power-on the computer. Verify the memory size; then test the memory. If an error appears, replace the IC DRAM card or the DIMM card.

If memory problems occur intermittently, use the loop option to repeat the test. When the test detects an error, an error log is printed on the printer connected to the parallel port. See "Error Log" for more information.

System Programs in Flash Memory:
System setup programs and diagnostic tests are stored in flash memory.

Flash Memory Update:
A flash memory update is required for the following conditions:
- New versions of system programs.
- New feature or options are added.

When Updating Flash Memory:

Do not power-off the computer., disconnect the Vac power, or remove the battery, during the Flash update. The system board will have to be replaced if the update is interrupted.

Updating Flash memory also resets all of the customer's configuration settings to the default values.

To update the Flash memory, perform the following steps:
1. Get the appropriate diskette which contains the update.
2. Insert the System Program Service Diskette into driveA and power-on the computer.
3. Select Update system programs from the menu.

System Board and Processor Card Checkout:
The processing functions are performed by both the system board and the processor card. Processor problems can be caused by either FRU. However, the processor card generally has a lower probability of failure. When a numeric code calls the system board or the processor card as a FRU, or the processor card is called by a diagnostic test by showing FRU code 11, use the following procedure to isolate the problem.

1. Run the system board test to verify the symptom. This test verifies both the system board and the processor card. If no error is detected, return to "General Checkout".
2. If FRU code 10 appears, replace the system board but do not replace the processor card. Transfer the processor card from the old system board to the new system board.
3. If FRU code 11 appears, reseat the processor card.
4. Rerun the test to verify the fix.
5. If FRU code 11 remains, replace the processor card.

If above procedure does not correct the problem, go to "Undetermined Problems". ThinkPad 755CD, 755CDV (9545)5

Keyboard/Auxiliary Input Device Checkout:
Remove the external keyboard if the internal keyboard is to be tested.

If the internal keyboard does not work or an unexpected character appears, make sure that the three flexible cables extending from the keyboard are correctly seated in the connectors on the interposer card.

If the keyboard cable connection is correct, run the Keyboard Test by doing the following:
1. Go to diagnostic menu screen by pressing Ctrl+A in the Easy-Setup screen.
2. Press Ctrl+K;a layout of the keyboard appears on the screen.
3. Check that when each key is pressed, the key position on the keyboard layout on the screen changes to a black square.

Note:
When a Fn key is pressed, a black square briefly appears. If the tests detect a keyboard problem, do the following one at a time to correct the problem. Do not replace a non-defective FRU.

- Reseat the three cables.
- Replace the keyboard.
- Replace the Video Card Assembly.
- Replace the system board.

The following auxiliary input devices are supported for this computer.
- Numeric keypad
- Mouse (PS/2 compatible)
- External keyboard (with keyboard/mouse cable)

If any of the above devices do not work, reseat the cable connector and repeat the failing operation.

If the problem does not occur again, recheck the connector.

If the problem is not corrected, replace the device, and then the system board.

TrackPoint III Checkout:
If the TrackPoint III will not work, check the configuration in the Easy-Setup by selecting Keyboard from the Config menu. If the configuration of the TrackPoint III is disabled, select Enable to enable it. If this does not correct the TrackPoint III problem, continue with the following.

The TrackPoint III does automatic compensations to adjust the pointer sensor. During this process, the pointer moves on the screen automatically for a short time. This self-acting pointer movement can occur when a slight, steady pressure is applied to the TrackPoint III pointer while the computer is powered on or while the system is running, or re-adjustment is required because the temperature has exceeded its normal temperature range. This symptom does not indicate a hardware problem. No service actions are necessary if the pointer movement stops in a short period of time.

If a click button problem or pointing stick problem occurs, do the following:
1. Go to the Easy-Setup screen.
2. Select an item with the pointing stick.
3. Press either the left or right click button.
4. Verify that both buttons work correctly.
If either the pointing stick or the click button will not work, do the following actions one at a time to correct the problem. Do not replace a non-defective FRU.6

- Reseat the three keyboard cables.
- Replace the keyboard.
- Replace the interposer card.
- Replace the system board.

Game Port Checkout:
Do the following if a joystick problem occurs.
1. Connect the Joystick to the Game Port.
2. Go to the Easy-Setup screen.
3. Select an item with the Joystick.
4. Press any button of the Joystick.
5. Verify all buttons work correctly.

If either the Joystick or button does not work, replace the system board.

Diskette Drive Test:
Do the following to isolate the problem to a controller, drive, or diskette. A scratch, write enabled, non-defective 2HD diskette is required.

Warning:
Make sure that the diskette does not have more than one label attached to it. Multiple labels can cause damage to the drive or can cause the drive to fail.

Do the following to select the test device:
1. Select the advanced diagnostic mode and select Tool; then select the icon FDD-1 or FDD-2 and press the space key.A| mark appears next to the selected icon. Insert the blank diskette when instructed.
2. Run the diskette drive test.
3. If the controller test detects an error, FRU code 10 appears. Replace the system board.
4. If the controller test runs without errors, the drive read/write tests start automatically.
5. If the drive test detects an error, FRU code 50 for FDD-1 or 51 for FDD-2 appears. If the diskette itself is known to be good, replace the drive.
6. If the drive is attached througha Port Replicator as FDD-1 or FDD-2 and the test detects errors, move the drive to the computer's diskette drive connector directly, and test it again as FDD-1. If no errors occur at the FDD-1 position, the drive is not defective. Go to "Port Replicator Checkout" in "Common Devices Checkout" section to isolate the replicator problem.
7. If the drive is attached through an Expansion Unit, go to the service manual of the Expansion Unit to isolate the problem.
8. If the drive is attached througha Diskette Drive Attachment Unit, replace the unit.

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	15-11-96
	Last Updated	19-08-98
	Revision Date	18-08-99
	Brand	IBM ThinkPad
	Product Family	ThinkPad 755CD, ThinkPad 755CDV
	Machine Type	9545
	Model	Various
	TypeModel
	Retain Tip (if applicable)	N/A
	Reverse Doclinks and Admin Purposes