Troubleshooting - IBM 6550-23N Service Manual

Additional Information
Additional Information

Troubleshooting

This section may help you isolate the cause of a problem and as a result, eliminate the need to contact technical support.
Symptom Check these items
No picture
If the u indicator is not lit • Check that the power cord is properly connected.
• Check that the u (power) switch is in the "on" position.
If the "CHECK SIGNAL • Check that your computer power switch is in the "on" position.
CABLE" message appears on • Check that the video signal cable is properly connected and all plugs are firmly seated
the screen, or if the u in their sockets.
indicator is either orange or • Ensure that no pins are bent or pushed in the video input connector.
alternating between green and • Check that the graphic board is completely seated in the proper bus slot.
orange
If the "MONITOR IS IN • The computer is in power saving mode. Try pressing any key on the computer
POWER SAVE MODE" keyboard, or moving the mouse.
message appears on the • Check that your computer power switch is in the "on" position.
screen, or if the u indicator is • Check that the graphic board is completely seated in the proper bus slot.
either orange or alternating
between green and orange
If the "OUT OF SCAN • Check that the video frequency range is within that specified for the monitor.
RANGE" message appears on (Horizontal: 30 – 94 kHz, Vertical: 48 – 120 Hz)
the screen Refer to your computer's instruction manual to adjust the video frequency range.
• If you are using a video signal cable adapter, check that it is the correct one.
If no message is displayed • See "Self-diagnosis Function" (page 18).
and the u indicator is green
or flashing orange
Picture is scrambled • Check your graphics board manual for the proper monitor setting.
• Check this manual and confirm that the graphics mode and the frequency you are
trying to operate at is supported. Even if the frequency is within the proper range,
some graphic boards may have a sync pulse that is too narrow for the monitor to sync
correctly.
Color is not uniform
• Degauss the monitor (page 10).
If you place equipment which generates a magnetic field, such as a loudspeaker, near
the monitor, or you change the direction of the monitor, color may lose uniformity.
The degauss function demagnetizes the metal frame of the CRT to obtain a neutral
field for uniform color reproduction. If a second degauss cycle is needed, allow a
minimum interval of 20 minutes for the best result.
You cannot adjust the • If the control lock function is set to ON, set it to OFF using the OPTION OSD
monitor with the buttons on (page12).
the front panel
16
Symptom Check these items
Screen image is not centered • Adjust the size or centering (page 6).
or sized properly Some video modes do not fill the screen to the edges. This problem tends to occur with
certain graphic boards.
• Adjust the geometry (page 7).
Edges of the image are
curved
White lines show red or blue • Adjust the convergence (page 9).
shadows at edges
Picture is fuzzy • Adjust the contrast and brightness (page 5).
• Degauss the monitor (page 10).
If you place equipment which generates a magnetic field, such as a loudspeaker, near
the monitor, or you change the direction of the monitor, color may lose uniformity.
The degauss function demagnetizes the metal frame of the CRT to obtain a neutral
field for uniform color reproduction. If a second degauss cycle is needed, allow a
minimum interval of 20 minutes for the best result.
• If red or blue shadows appear along the edges of images, adjust the convergence
(page9).
• Select MOIRE ADJUST and adjust the moire cancellation effect (page 11).
Picture bounces or has wavy • Isolate and eliminate any potential sources of electric or magnetic fields. Common
oscillations causes for this symptom are electric fans, fluorescent lighting, or laser printers.
• If you have another monitor close to this monitor, increase the distance between them
to reduce the interference.
• Try plugging the monitor into a different AC outlet, preferably on a different circuit.
• Try the monitor on a different computer in a different room.
Picture is flickering • Set the refresh rate on the computer to obtain the best possible picture by referring to
your computer's manual.
Picture appears to be • Eliminate the use of video cable extensions and/or video switch boxes if this symptom
ghosting occurs. Excessive cable length or a weak connection can produce this symptom.
Wavy or elliptical (moire) • Select MOIRE ADJUST and adjust the moire cancellation effect (page 11).
pattern is visible The moire may be modified depending on the connected computer.
• Due to the relationship between resolution, monitor dot pitch and the pitch of some
image patterns, certain screen backgrounds sometimes show moire. Change your
desktop pattern.
Two fine horizontal lines • These wires stabilize the vertically striped aperture grille (page 14). This aperture grille
(wires) are visible allows more light to pass through to the screen giving the Trinitron CRT more color
and brightness.
Hum is heard right after the • When the power is turned on, the auto-degauss cycle is activated. While the auto-
power is turned on degauss cycle is activated, a hum may be heard. The same hum is heard when the
monitor is manually degaussed. This is not a malfunction.
• If the problem persists, call the IBM HelpCenter.
In the US. call 1-800-772-2227
In Canada call 1-800-565-3344
• Note the model name and the serial number of your monitor. Also note the make and name of your computer and graphic
board.
Getting Started Additional Information
Additional Information
EN
F
ES
C
17