Lenovo THINKPAD T41/T41P Bedienungsanleitung PDF herunterladen (Seite 71)

Intermittent problems

Intermittent system hang problems can be due to a variety

of causes 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 problem recurs.

When analyzing an intermittent problem, do the following:

1. Run the 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

If the diagnostic tests did not identify the adapter or device

that has failed, if wrong devices are installed, or if the

system simply is not operating, follow these procedures to

isolate the failing FRU (do not isolate FRUs that have no

defects).

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 system

checkout” on page 39.)

1. Turn off the computer.

2. Visually check each FRU for damage. Replace any

damaged FRU.

3. Remove or disconnect all of the following devices:

a. Non-ThinkPad devices

b. Devices attached to the port replicator

c. Printer, mouse, and other external devices

d. Battery pack

e. Hard disk drive

f. External diskette drive

g. DIMM

h. CD-ROM and diskette drive in the Ultrabay

i. PC Cards

4. Turn on the computer.

5. Determine whether the problem has been solved.

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):

a. System board

b. LCD assembly

Symptom-to-FRU index

ThinkPad T40/T40p, T41/T41p, T42/T42p Series 65

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 259 260

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