IBM THINKPAD S05L-1270-01 - Manual (Page 49)

5. Reconnect the failing device directly to the computer.
(If another device is already connected to the
computer, remove it first.)
6. Go to the “How to Run the Diagnostics” on page 54
and run the diagnostics.
7. If the advanced diagnostic device test does not find
an error, suspect a problem with the port replicator of
the system expansion bus.
8. Power off the computer and reconnect the port
replicator.
9. Power on the computer and run the following
advanced diagnostic tests:
Serial port test with the wrap plug installed on
the replicator
Parallel port test with the wrap plug installed on
the replicator
FDD-2 device test on the failing device with
scratch diskette
10. If diagnostic errors appear, replace the replicator or
diskette drive attachment unit.
If the problem remains after the replacement, replace
the system board.
11. If power problems appear only when the replicator is
used, replace the replicator.
External Display Self-Test: If the display problem
occurs only when using an external display, use the
following instruction to correct the problem.
Note: Before you replace a display, check that the 95XX
systems support either 63XX, 85XX, or 95XX
displays to see if it is connected correctly.
If the screen is rolling, replace the external display. If that
does not correct the problem, replace the FRUs in the
following order until the problem goes away:
1. System board
2. Bus adapter (if used)
If the screen is not rolling, run the display self-test as
follows:
1. Power-off the computer and display.
2. Disconnect the display signal cable.
3. Power-on the display
4. Set the contrast to its maximum position.
5. Set the brightness control to the center detent
position.
Check for the following conditions:
You should be able to vary the screen intensity by
adjusting the contrast and brightness control.
The screen should be white or light gray, with a black
margin (test margin) on the screen.
The screen is set to CRT or both by the ThinkPad
Features program.
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