Sony GDM-90W01T - Manual (Page 19)

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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.
Symptom Check these items
White lines show red or
blue shades at edges
Picture is fuzzy
Picture bounces or has
wavy oscillations
Picture is not stable
Picture appears to be
ghosting
Two fine horizontal lines
(wires) are visible
Wavy or elliptical (moire)
pattern is visible
Hum is heard right after
the power is turned on
• Adjust the convergence (pages 10, 13).
• 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).
• Isolate and eliminate any potential sources of electric or magnetic fields. Common
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.
• Set the refresh rate to non-interlace of 75 Hz or more on the computer referring to the
computer’s manual.
• Eliminate the use of video cable extension cable and/or video switch boxes if this
symptom occurs. Excessive cable length or weak connection can produce this symptom.
• These wires stabilize 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.
• Cancel the moire (pages 10, 14).
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.
• When the power is turned on, the auto-degauss cycle is activated. While the Auto-
degauss cycle is activated, a hum may be heard. This is not a malfunction.