Monitor Problems - Lenovo 3633 Installation And Service Manual

Monitor problems

Some Lenovo monitors have their own self-tests. If you suspect a problem with your monitor, see the
documentation that comes with the monitor for instructions for testing and adjusting the monitor. If you
cannot diagnose the problem, call for service.
Table 15. Monitor and video symptoms and actions
Symptom
Testing the monitor.
The screen is blank.
The monitor works when you
turn on the server, but the
screen goes blank when you
start some application
programs.
Action
1. Make sure that the monitor cables are firmly connected.
2. Try using a different monitor on the server, or try using the monitor that is being
tested on a different server.
3. Run the diagnostic programs. If the monitor passes the diagnostic programs,
the problem might be caused by a video device driver.
4. (Trained technician only) Replace the system board.
1. If the server is attached to a KVM switch, bypass the KVM switch to eliminate it
as a possible cause of the problem: connect the monitor cable directly to the
correct connector on the rear of the server.
2. Make sure that:
• The server is turned on. If there is no power to the server, see
problems" on page
• The monitor cables are connected correctly.
• The monitor is turned on and the brightness and contrast controls are
adjusted correctly.
• No POST errors are generated when the server is turned on.
3. Make sure that the correct server is controlling the monitor, if applicable.
4. Make sure that damaged server firmware is not affecting the video. See
"Updating the firmware" on page
5. Observe the checkpoint LEDs on the system board; if the codes are changing,
go to the next step.
6. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Monitor
b. Video adapter (if one is installed)
c. (Trained technician only) System board
1. Make sure that:
• The application program is not setting a display mode that is higher than the
capability of the monitor.
• You installed the necessary device drivers for the application.
2. Run video diagnostics. See
page 57.
• If the server passes the video diagnostics, the video is good. Then, you can
refer to "Solving undetermined problems" on page
• (Trained technician only) If the server fails the video diagnostics, replace the
system board.
68.
25.
"Running DSA Preboot diagnostic program" on
"Power
71.
.
Chapter 5 Troubleshooting
65