CPD-201VS - Sony Monitor Service Manual (repair manual). Page 12

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This section may help you isolate a problem and as a result, eliminate the
need to contact technical support, allowing continued productivity.

If the U indicator is not lit
m Check that the power cord is properly connected.
m Check that the U switch is in the “on” position.

If the “NO INPUT SIGNAL” message appears on the screen, or if the U
indicator is either orange or alternating between green and orange
m Try pressing any key on the computer keyboard.
m Check that your computer power switch is in the “on” position.
m Check that the video signal cable is properly connected and all plugs

are firmly seated in their sockets.

m Ensure that no pins are bent or pushed in the HD15 video input

connector.

If the “OUT OF SCAN RANGE” message appears on the screen
m Check that the video frequency is within that specified for the display.

Horizontal: 30 – 70 kHz
Vertical: 50 – 120 Hz
Refer to your computer’s instruction manual to adjust the video
frequency range.

m If you are using a video signal cable adapter, check that it is the correct

one.

If no message is displayed and the U indicator is green or flashing orange
m See “Self-diagnosis function” (page 39).

If the ¤ indicator is displayed
m Press the ¤ button to cancel muting.

m Check that the audio plug is properly connected.
m Adjust the volume with . +/– buttons.
m Check that the headphones are not connected.
m Check the volume control, muting, sound selector, etc. of the sound

board.  (See the computer’s manual.)

m Check that the MIC plug is properly connected.
m Check the microphone control, sound selector, etc. of the sound board.

(See the computer’s manual.)

Troubleshooting

m Decrease the volume with . +/– buttons, or turn down the

microphone input volume of the sound board.

m Check your computer manual for the proper display setting.
m Check this manual and confirm that the graphic mode and the

frequency you are trying to operate 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 display to sync correctly.

m Degauss the display (page 27).

If you place equipment which generates a magnetic field, such as a
speaker, near the display, or you change the direction of the display,
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.

m Adjust the size or centering (pages 22, 23).
m Some video modes do not fill the screen to the edge. This problem

tends to occur with certain video boards.

m Adjust the geometry (page 24).

m Adjust the contrast and brightness (page 21). Some brands of video

boards have an excessive video output level which creates a fuzzy
picture at maximum contrast.

m Degauss the display (page 27).

If you place equipment which generates a magnetic field, such as a
speaker, near the display, or you change the direction of the display,
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.

m If moiré is cancelled, the picture may become fuzzy.  Decrease the

moiré cancellation effect (page 26).

m If the GPE mode is set to AUTO, change it to OFF (page 32).

Continued to the next page ➔

Troubleshooting

m Isolate and eliminate any potential sources of electric or magnetic

fields. Common causes for this symptom are electric fans, fluorescent
lighting, laser printers, etc.

m If you have another display close to this display, increase the distance

between them to reduce interference.

m Try plugging the display into a different AC outlet, preferably on a

different circuit.

m Set the refresh rate on the computer to obtain the best possible picture

by referring to your computer’s manual.

m If the GPE mode is set to AUTO, change it to OFF (page 32).

m Eliminate the use of video extensions and/or video switch boxes if

this symptom occurs. Excessive cable length or weak connections can
produce this symptom.

m If the GPE mode is set to AUTO, change it to OFF (page 32).
m If the GPE mode is set to MODE 2, the picture may appear to be

ghosting. Set to another GPE mode (page 32).

m Cancel the moiré (page 26).

The moiré may be modified depending on the connected computer.

m Due to the relationship between resolution, display dot pitch and the

pitch of some image patterns, certain screen backgrounds sometimes
show moiré.  Change your desktop pattern.

m Check that all four corners of the “IntelliLight” window are clearly

displayed and are not covered by another window.

m Check that the GPE mode is set to AUTO (page 32).
m Leave the display’s power “on” and reboot your computer.
m IntelliLight does not work correctly with an interlaced video mode.

Check the vertical refresh rate in the Properties window of Windows
95/98 and select a non-interlaced mode.

m Set the GPE mode to AUTO (page 32).
m Check that all four corners of the “IntelliLight” window are clearly

displayed and are not covered by another window.

Troubleshooting

m This wire stabilizes the vertically striped Aperture Grille (page 16).

This Aperture Grille allows more light to pass through to the screen
giving the Trinitron CRT more color and brightness.

m 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 display is manually degaussed. This is
not a malfunction.

• If the problem persists, call your authorized Sony dealer from a

location near you, or call Sony Technical Support at 1-888-4SONYPC
(1-888-476-6972).

• Note the model name and the serial number of your display. Also note

the make and name of your computer and video board.

This display is equipped with a self-diagnosis function. Use this function
if there is a problem with your display or computer.

Disconnect the video input cable or turn off the connected computer.

Turn the display off and on.

Press and hold the >/ button for more than 2 seconds.

If all four color bars appear (white, red, green, blue) after a few seconds,
the display is working properly, but there might be a problem with your
computer. Contact your computer’s manufacturer.
If the color bars do not appear, there might be a problem with the
display. Contact your local authorized Sony dealer, or call Sony Technical
Support at 1-888-4SONYPC (1-888-476-6972).

Troubleshooting