Lenovo ThinkServer RD240 Hardware Maintenance Manual page 23

• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• See the parts listing in Chapter 6 "Parts listing, RD240 Types 1045, 1046, 1047, and 1048" on page 89 to
determine which components are customer replaceable units (CRUs) and which components are field
replaceable units (FRUs).
• 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.
The monitor has screen
jitter, or the screen image is
wavy, unreadable, rolling, or
distorted.
Wrong characters appear on
the screen.
Action
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 "Power
problems" on page 19.
• 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. See "Solving undetermined problems" on page 22.
1. If the monitor self-tests show that the monitor is working correctly, 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.
Attention: Moving a color monitor while it is turned on might cause screen
discoloration.
Move the device and the monitor at least 305 mm (12 inches) apart, and turn on
the monitor.
To prevent diskette drive read/write errors, make sure that the distance between
the monitor and any external diskette drive is at least 76 mm (3 inches).
2. Reseat the monitor.
3. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Monitor
b. (Trained service technician only) System board
1. If the wrong language is displayed, update the server firmware with the correct
language (see Updating the firmware).
2. Reseat the monitor.
3. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Monitor
b. (Trained service technician only) System board
17
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Chapter 3 Diagnostics