TP 600/E - Undetermined and intermittent symptoms

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Service Hints & Tips

Document ID: LWIK-3YGNKP

TP 600/E - Undetermined and intermittent symptoms

Applicable to: World-Wide

The following information is intended for IBM Dealers and Authorized Servicers only. Customers attempting to follow any of the procedures below may void their warranty.

Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a recurring problem exists. When analyzing an intermittent problem, do the following:
1. Run the advanced diagnostic test for the system board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more errors exist.

Undetermined Problems
You are here because the diagnostic tests did not identify which adapter or device failed, installed devices are incorrect, a short circuit is suspected, or the system is inoperative. Follow these procedures to isolate the failing FRU (do not isolate nondefective FRUs). Verify that all attached devices are supported by the computer.

Verify that the power supply being used at the time of the failure is operating correctly. (See Power Systems Checkout in the HMM):
1. Power off the computer.
2. Visually check them for damage. If any problems are found, replace the FRU.
3. Remove or disconnect all of the following devices:

Non-IBM devices
Devices attached to the port replicator
Printer, mouse, and other external devices
Battery pack
Hard disk drive
External diskette drive
DIMM
CD-ROM and diskette drive in the UltraslimBay
PC Cards

4. Power on the computer.
5. Determine if the problem has changed.
6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one at a time. Do not replace a nondefective FRU:

System board
LCD assembly
CPU card

Search Keywords

Hint Category

Hardware Maintenance Information

Date Created

19-09-98

Last Updated

19-01-99

Revision Date

19-01-2000

Brand

IBM ThinkPad

Product Family

ThinkPad 600, ThinkPad 600E

Machine Type

2645, 2646

Model

Various

TypeModel

Retain Tip (if applicable)

Reverse Doclinks
and Admin Purposes

	Search Keywords
	Hint Category	Hardware Maintenance Information
	Date Created	19-09-98
	Last Updated	19-01-99
	Revision Date	19-01-2000
	Brand	IBM ThinkPad
	Product Family	ThinkPad 600, ThinkPad 600E
	Machine Type	2645, 2646
	Model	Various
	TypeModel
	Retain Tip (if applicable)
	Reverse Doclinks and Admin Purposes