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b. Port replicator.
c. System board of the computer.
External Monitor
If the screen is rolling, replace the external monitor.
If the problem is not corrected, replace FRUs in the
following order one at a time until the problem is corrected:
Note: If the replaced parts did not resolve the problem,
put the original parts back in the SelectaDock
Docking System. Do not replace nondefective
parts.
If the external monitor is attached to the SelectaDock
Docking System:
1. Main card.
If the external monitor is attached to the display
adapter card:
1. Display adapter card.
2. Main card.
3. Riser card.
If the screen is not rolling, do the following to run the
display self-test:
1. Turn off the computer on the SelectaDock Docking
System and the external monitor.
2. Disconnect the external monitor signal cable from the
SelectaDock Docking System.
3. Turn on the external monitor.
4. Turn the contrast control to its maximum position.
5. Turn the brightness control to its center detect
position.
Check for the following conditions:
The screen should be white or light gray, with a black
margin. See the appropriate display manuals for the
correct self-test condition.
The screen contrast and brightness controls should
change the intensity of the screen.
If the external monitor does not meet these specifications,
replace the external monitor.
If the external monitor meets these specifications, replace
FRUs in the following order one at a time until the problem
is corrected:
Note: If the replaced parts did not resolve the
problem, put the original parts back in the
SelectaDock Docking System. Do not replace
nondefective parts.
If the external monitor is attached to the SelectaDock
Docking System:
1. Main card.
2. External monitor.
630 IBM Mobile Systems HMM