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Service Hints & Tips |
Document ID: BMOE-42JGQ7 |
TP 390,172x - Intermittent and undetermined problems
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, electronic discharge, or software errors. FRU replacement should be considered only when a recurring problem exists. When analyzing an intermittent problem, do the following:
- Run the advanced diagnostic test for the planar board in loop mode at least 10 times.
- If no error is detected, do not replace any FRUs.
- 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, which installed devices are incorrect, whether a short circuit is suspected, or whether the system is inoperative. Follow these procedures to isolate the failing FRU (do not isolate nondefective FRUs).
Verify that the power supply being used at the time of the failure is operating correctly. (See "Power System Checkout").
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:
a. Non-IBM devices
b. Devices attached to the ThinkPad Port Replicator with Advanced Etherjet Feature
c. Printer, mouse, and other external devices
d. Battery ASM
e. Hard disk drive
f. DIMM
g. CD-ROM and Diskette Drive (FDD ASM) in the Combobay (UltraBay FX)
h. PC Cards (PCMCIA)
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 non-defective FRU.
a. Planar board
b. LCD panel ASM
c. CPU card
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Hint Category |
Error Messages |
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Date Created |
24-11-98 |
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Last Updated |
06-04-99 |
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Revision Date |
06-04-2000 |
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Brand |
IBM ThinkPad |
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Product Family |
ThinkPad 390, ThinkPad 390E, ThinkPad i Series 172x |
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Machine Type |
2626, 2627 |
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Model |
Various |
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TypeModel |
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Retain Tip (if applicable) |
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