Troubleshooting - Sony Trinitron GDM-200PS Service Manual

Additional Information Additional Information
Warning Messages
If there is something wrong with the input signal, one of the
following messages appears.
The message disappears after about 30 seconds.
INFORMATION
OUT OF SCAN RANGE
INPUT : HD15

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 "NO INPUT SIGNAL" • Try pressing any key on the computer keyboard.
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 input select setting is correct.
either orange or alternating • Check that the video signal cable is properly connected and all plugs are firmly seated
in their sockets.
between green and orange
• Check that the 5 BNCs are connected in the correct order (from left to right: Red–
Green–Blue–HD–VD) (page 6).
• Ensure that no pins are bent or pushed in the HD15 video input connector.
• Check that the video board is completely seated in the proper bus slot.
If the "OUT OF SCAN • Check that the video frequency range is within that specified for the monitor.
RANGE" message appears on (Horizontal: 30 – 92 kHz, Vertical: 48 – 160 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 correct.
If no message is displayed • See "Self-diagnosis Function" (page 22).
and the u indicator is green
or flashing orange
If using a Macintosh system • Check that the Macintosh adapter and the video signal cable are properly connected
(page 6).
® • If you cannot find "GDM-200PS" among the Sony monitors in the Windows 95
If using Windows 95
monitor selection screen, select the DDC standard monitor or install the Windows 95
Monitor Information Disk (page 7).
The DDC standard does not apply to the 5 BNC connectors. If you use the DDC
standard, connect the computer to the HD15 connector with the supplied video signal
cable.
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 video boards may have a sync pulse that is too narrow for the monitor to sync
correctly.
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1 The input signal condition
"OUT OF SCAN RANGE" indicates that the input signal
is not supported by the monitor's specifications.
"NO INPUT SIGNAL" indicates that no signal is input, or
the input signal from the selected input connector is not
received.
2 The selected input connector
Indicates which input connector is receiving the wrong
signal. If there is something wrong with the signal from
both input connectors, "HD15" and "BNC" are
displayed alternately.
To solve these problems, see "Troubleshooting" below.
Symptom Check these items
Color is not uniform • Degauss the monitor (page 15).
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 (page 16).
monitor with the buttons on
the front panel
White does not look white • Adjust the color temperature (page 13).
• Check that the 5 BNCs are connected in the correct order (from left to right: Red–
Green–Blue–HD–VD) (page 6).
• Adjust the size or centering (page 11).
Screen image is not centered
or sized properly • Some video modes do not fill the screen to the edges. This problem tends to occur with
certain video boards.
Edges of the image are • Adjust the geometry (page 12).
curved
• Adjust the convergence (page 14).
White lines show red or blue
shadows at edges
Picture is fuzzy • Adjust the contrast and brightness (page 9).
• Degauss the monitor (page 15).
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 (page
14).
• If the moire is cancelled, the picture may become fuzzy. Decrease the moire
cancellation effect (page 14).
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.
• Cancel the moire (page 14).
Wavy or elliptical (moire)
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.
• These wires stabilize the vertically striped aperture grille (page 19). This aperture grille
Two fine horizontal lines
(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-
degauss cycle is activated, a hum may be heard. The same hum is heard when the
power is turned on
monitor is manually degaussed. This is not a malfunction.
Getting Started
Additional Information
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