IBM S09N-8590-00 manual Undetermined Problems

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, 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 non-defective	FRUs).

Verify that the power supply being used at the time of the failure is operating correctly. (See “Power System

Checkout” on page 10.)

1.Power off the computer.

2.Visually check for damage. If any problems are found, replace the FRU.

3. Remove or disconnect all of the following devices:

a.Non-IBM devices

b. Printer, mouse, and other external devices

c.Battery ASM

d. Hard disk drive

e.DIMM

f. 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.	System board
	b.	LCD	panel	ASM

22 ThinkPad 240