Sony GDM-20OPS manual 21

Additional Information

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 (pages 12 – 13).
	• Check that the 5 BNCs are connected in the correct order (from left to right: Red–
	Green–Blue–HD–VD) (page 6).
Screen image is not centered	• Press the ASC button (page 7).
or sized properly	• Adjust the size or centering (page 10).
	• 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 11).
curved
White lines show red or blue • Adjust the convergence (pages 13 – 14).
shadows at edges
		EN
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
	(pages 13 – 14).
	• If the moire is cancelled, the picture may become fuzzy. Decrease the moire
	cancellation effect (pages 13 – 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 changing the direction of the monitor. For example, if it is facing South, turn it so
	that it is facing East.
	• Move the monitor away from power lines or place a magnetic shield around it.
	• Try plugging the monitor into a different AC outlet, preferably on a different circuit.
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)	• Cancel the moire (pages 13 – 14).
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 19). This is not a
(wires) are visible	malfunction.
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 (3 seconds), a hum may be heard. The same hum is heard
	when the monitor is manually degaussed. This is not a malfunction.

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