Dell D825TM Panduan Servis - Halaman 9

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1. Color Monitor

Symptom

Check these items

You cannot adjust the monitor

• If the Control Lock function is set to "ON," set it to "OFF" using the OPTION OSD (page 8).

with the buttons on the front

panel

Screen image is not centered or

• Adjust the size (page 8) or centering (page 7).

sized properly

• 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 curved

• Adjust the geometry (page 9).

White lines show red or blue

• Adjust the convergence using the SCREEN OSD (page 7).

shadows at edges

Picture is fuzzy

• Adjust the contrast and brightness (page 6).

• Degauss the monitor using the OPTION OSD (page 8).

If you place equipment which generates a magnetic field, such as a loudspeaker, near the

monitor, or you change the direction of the monitor, the color may not be uniform.

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 using the

SCREEN OSD (page 7).

• If the moire is cancelled, the picture may become fuzzy. Decrease the moire cancellation

effect using the SCREEN OSD (page 7).

Picture bounces or has wavy

• Isolate and eliminate any potential sources of electric or magnetic fields. Common causes

oscillations

for this symptom are electric fans, fluorescent lighting and laser printers.

• 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 using the monitor with a different computer in a different room.

Picture is flickering

• Refer to your computer system's manual and change your display refresh rate settings so

they match the monitor's capabilities.

Picture appears to be

• Eliminate the use of video cable extensions and/or video switch boxes. Excessive cable

ghosting

length or a weak connection can produce this symptom.

Wavy or elliptical (moire) pattern

• Cancel the moire using the SCREEN OSD (page 7).

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.

One fine horizontal line (wire) is

• This wire stabilizes the vertically striped aperture grille (page 3). This aperture grille allows

visible

more light to pass through to the screen giving the Trinitron CRT more color and

brightness.

Hum is heard right after the

• When the power is turned on, the auto-degauss cycle is activated. While the auto-degauss

power is turned on

cycle is activated, a hum may be heard. The same hum is heard when the monitor is

manually degaussed. This is not a malfunction.

White does not look white

• Adjust the color temperature using the COLOR OSD (page 7).

Getting Started

Additional Information