Sony GDM-90W01T manual Symptom Check these items White lines show red or, Picture bounces or has

Symptom	Check these items
White lines show red or	• Adjust the convergence (pages 10, 13).
blue shades at edges
Picture is fuzzy	• Adjust the contrast and brightness (pages 8, 12).
	• Degauss the monitor (page 15).
	If you place equipment which generates a magnetic field such as a loudspeaker, or you
	change the direction of the monitor, color may lose uniformity.
	This function is to demagnetize 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 shades are found at the edge of images, adjust the convergence (pages 10,
	13).
	• If the moire is cancelled, the picture may become fuzzy. Adjust so that the picture is as
	clear as possible (pages 10, 14).
Picture bounces or has	• Isolate and eliminate any potential sources of electric or magnetic fields. Common
wavy oscillations	causes for this symptom are electric fans, fluorescent lighting, laser printers, and so on.
	• 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 completely different computer in a different room.
Picture is not stable	• Set the refresh rate to non-interlace of 75 Hz or more on the computer referring to the
	computer’s manual.
Picture appears to be	• Eliminate the use of video cable extension cable and/or video switch boxes if this
ghosting	symptom occurs. Excessive cable length or weak connection can produce this symptom.
Two fine horizontal lines	• These wires stabilize the vertically striped Aperture Grille (page 16). This Aperture
(wires) are visible	Grille allows more light to pass through to the screen giving the Trinitron CRT more
	color and brightness.
Wavy or elliptical (moire)	• Cancel the moire (pages 10, 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, especially gray, sometimes show moire.
	Change your desktop pattern.
Hum is heard right after	• When the power is turned on, the auto-degauss cycle is activated. While the Auto-
the power is turned on	degauss cycle is activated, a hum may be heard. This is not a malfunction.

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•If the problem persists, call your service representative from a location near your monitor.

•Note the model name and the serial number of your monitor. Also note the make and name of your computer and video board.

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