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Sony CPD-120AS: Troubleshooting

Troubleshooting: Sony CPD-120AS

Troubleshooting

This section may help you isolate a problem and as a result, eliminate the

need to contact technical support, allowing continued productivity.

No picture

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 u indicator is lit in orange, or alternately in orange and green

m Check that your computer power switch is in the “ON” position.

m The display may recover when you press any key on the keyboard of

the computer.

m Check that the video cable is properly connected.

m Ensure that no pins are bent or pushed in the HD15 connector of the

cable.

m Check that the video card in your computer is seated completely in a

proper bus slot.

m Check that the video sync signal is within that specified for the

display.

m This display has a self-diagnostics function. To activate the function,

turn off the computer and the display. Press and hold the u switch of

the display for about 8 seconds. If the display is operating correctly,

the screen will become white first and then the color bars will appear.

If the u indicator is flashing in orange

m Check that the video sync signal is specified for the display.

m There is a potential display failure. Contact Sony Technical Support.

No sound from speaker

If the ¤ indicator is lit

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 that the sound board of the computer is properly connected.

m Check that the volume control, muting, sound selector, etc. of the

sound board. (See the computer’s manual.)

Microphone mixing is not possible

m Check that the MIC plug is properly connected.

m Check that the sound board of the computer is properly connected.

m Check that the microphone control, sound selector, etc. of the sound

board. (See the computer’s manual.)

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Howling (feed-back) is heard

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

microphone input volume of the sound board.

Picture is scrambled

m Check your graphics board manual for the proper display setting on

the display.

m Check this manual and confirm that the graphic mode and the

frequency at which you are trying to operate is supported. Even

within the proper range, some video boards may have a sync pulse

that is too narrow for the display to sync correctly.

Color is not uniform

m Trip the u switch once to activate the Auto-degauss cycle*.

Picture is flickering

m If the refresh rate is not appropriate, the picture may flicker. Set the

refresh rate of the non-interlace mode as high as possible on the

computer. For details on how to set the refresh rate, consult the dealer

of your computer or video board.

Screen image is not centered or sized properly

m Adjust picture centering, size, or geometry (rotation/ pincushion) on

the OSD (pages 19–22).

m Some video modes do not fill the screen to the edge of the display.

There is no single answer to solve the problem. There is a tendency for

this problem to occur on higher refresh timings.

Picture is fuzzy

m Adjust the contrast and brightness on the OSD (pages 17, 18). Some

brands of SVGA boards have an excessive video output level which

creates a fuzzy picture at maximum contrast.

m The GPE setting may not be proper for the picture. Selecting a lower

GPE number may improve the picture (page 25).

m Trip the u switch once to activate the Auto-degauss cycle*.

Picture bounces or has wavy oscillations

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.

Picture appears to be ghosting

m Eliminate the use of video extension cables and/or video switch boxes

if this symptom occurs. Excessive cable length or weak connections

can produce this symptom.

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Troubleshooting

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Fine horizontal lines (wires) are visible

m These wires stabilize the vertically striped Aperture Grille. The

Aperture Grille allows more light to pass through to the screen giving

the Trinitron CRT more color and brightness.

Wavy or elliptical (moire) pattern is visible

m Due to the relationship between resolution, display Aperture Grille

pitch and the pitch of some image patterns, certain screen

backgrounds, especially gray, sometimes show moire which looks like

wavy lines. This can only be eliminated by changing your desktop

pattern.

Hum is heard right after the power is turned on

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 for

about 3 seconds. This is not a malfunction.

* The Auto-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 the problem persists, call your authorized Sony dealer from a

location near you, or call Sony Technical Support.

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

the make and name of your computer and video board.

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