Monitor Or Video Problems - IBM BladeCenter JS21 Types 8844 Service Manual

Monitor or video problems

Some IBM 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.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Types 7988 and 8844," on page 137 to determine which components are
CRUs and which components are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
The screen is blank.
Only the cursor appears.
The monitor goes blank when
you direct it to a working blade
server, or goes blank when you
start some application programs
in the blade servers.
The screen is wavy, unreadable,
rolling, distorted, or has screen
jitter.
Action
1. Make sure that:
v The keyboard/video select button LED on the front of the blade server is lit,
indicating that the blade server has ownership of the keyboard and video.
v The monitor cables are connected properly.
v The monitor is turned on and the Brightness and Contrast controls are
adjusted correctly.
v The blade server is using a supported Linux operating system that has
loaded completely.
2. If you have verified these items and the screen remains blank, replace:
a. Monitor
b. Management module on the BladeCenter unit (see the Hardware
Maintenance Manual and Troubleshooting Guide or Problem Determination
and Service Guide for your BladeCenter unit).
Make sure that the keyboard/video ownership on the BladeCenter unit has not
been switched to another blade server. If the problem remains, see "Solving
undetermined problems" on page 135.
Make sure that the monitor cable is connected to the video port on the
BladeCenter management module. Some IBM monitors have their own self-tests. If
you suspect a problem with the monitor, see the information that comes with the
monitor for adjusting and testing instructions.
If you still cannot find the problem, try using the monitor with another blade server.
If the problem remains, see the Hardware Maintenance Manual and
Troubleshooting Guide or Problem Determination and Service Guide for your
BladeCenter unit.
1. If the monitor self-tests show the monitor is working properly, consider the
location of the monitor. Magnetic fields around other devices (such as
transformers, appliances, fluorescent lights, and other monitors) can cause
screen jitter or wavy, unreadable, rolling, or distorted screen images. If this
happens, turn off the monitor. (Moving a color monitor while it is turned on
might cause screen discoloration.) Then move the device and the monitor at
least 305 mm (12 in.) apart. Turn on the monitor.
Notes:
a. To prevent diskette drive read/write errors, be sure the distance between
monitors and diskette drives is at least 76 mm (3 in.).
b. Non-IBM monitor cables might cause unpredictable problems.
2. Replace the monitor.
3. Replace the system-board and chassis assembly.
119
Chapter 2. Diagnostics