IBM Laptop MT 2632 User Manual download pdf (Page 51)

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, wrong devices are installed,

a short circuit is suspected, or the system is inoperative.

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 29.)

1. Power 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-IBM 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 UltraslimBay

i. PC Cards

4. Power on the computer.

5. Determine whether 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):

a. System board

b. LCD assembly

FRU replacement notices

This section contains notices related to removing and

replacing parts. Read this section carefully before replacing

any FRU.

Screw notices

Loose screws can cause a reliability problem. The an IBM

ThinkPad computer address this problem with special

nylon-coated screws that have the following characteristics:

v They maintain tight connections.

v They do not easily come loose, even with shock or

vibration.

Symptom-to-FRU index

ThinkPad A21e 47

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 105 106

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IBM Laptop MT 2632 User Manual Page 51

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