Lenovo THINKSERVER 3821 - Manual (Page 79)

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 8, “Parts Listing, TD200x Machine Types 3719, 3821, 3822, and 3823,” on page 237 to
determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
The monitor has screen jitter, or
the screen image is wavy,
unreadable, rolling, or distorted. 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 in.) apart, and turn on
the monitor.
Notes:
a. 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
in.).
b. Non-Lenovo monitor cables might cause unpredictable problems.
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
Wrong characters appear on the
screen. 1. If the wrong language is displayed, update the server firmware with the correct
language (see “Updating the firmware” on page 267).
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
Chapter 5. Diagnostics 71