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FREQUENTLY ASKED QUESTIONS: |
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Q. Why do I see thin horizontal lines visible on either the top or bottom third of the screen.
A. The thin horizontal line that is visible with light background on a Trinitron monitor,
is a shadow of the aperture grille damper wire. The function of the damper wire is to keep the wires that make up the aperture grille from vibrating.
Q. Why is one edge of the image lower than the other edge?
A. The earth's magnetic field may be interfering with the magnetic field generated by the monitor causing a slight rotation of the image. To have the best alignment, orient the monitor so that when sitting in front of the monitor, you are facing a westerly direction and the monitor is facing east. As a guideline, there may be approximately up to an 1/8" rotation allowed when viewing a solid background image at full screen size.
Some models have a Tilt/Rotation control that allows the user to compensate for minor variances.
Q. When I have a white background up, such as in a word processor, some areas of the screen are a little darker than the center. Is my monitor bad?
A. The monitor is not bad. The electron beams pass through either a shadow mask or aperture grille which aims them at the proper phosphor color. In high resolution displays, these beams are focused to a fine point, and are slightly smaller than the opening through which they must pass. Nearer to the edges of the tube, the beams may not pass through the exact center of the opening, and part of the beam is blocked. This is called eclipsing. The result is that less beam area strikes the phosphor, and the illumination there is less than that at or near the center of the CRT. This is not an uncommon situation, and the term used is brightness uniformity. Up to 30 percent less illumination than the central area is considered acceptable. Brightness uniformity should not be confused with purity, as discussed earlier.
Q. The color on my monitor is washed out. What can I do?
A. First properly adjust the brightness and contrast. If you still feel that the colors are washed out then if your model has color control select one of the other temperature settings or adjust the RGB color balance.
Unlike televisions, monitors do not have a color level control to control overall color. Once the monitor is properly adjusted reducing the brightness will also saturate colors, but reduce overall picture intensity slightly.
Q. I have faint ghosts to the right of my icons. Is my monitor bad?
A. No. The likely cause is that you are using an extension cable added to the video cable that came attached to the monitor. This happens because the video card cannot drive the monitor properly with through the extension. This is called impedance mismatch. If extending the cable is necessary, you need to purchase a video distribution amplifier, available from video equipment suppliers. If you are not using an extension, test the monitor on another computer
Q. I hear a low buzz coming from my monitor. Is something wrong?
A. No. What you hear is the vibration of the vertical deflection coils sweeping the beam during the vertical refresh of the display. Since it operates from 60 to 76 Hertz (cycles per second), depending on the refresh rate your controller is programmed for, it is within the range of human hearing. You cannot detect the resonation of the horizontal coils because the frequency is from 30,000 to 64,000 Hertz which is so high it is inaudible
Q. Sometimes my monitor makes a high pitched noise. Is this a sign of trouble?
A. Usually the sound is from one of the transformers in the monitor which resonate due to the gap in their core upon which the coils are wound. Minute physical changes occurring due to normal warming may cause the gap to assume a spacing just right so the magnetic field sets it vibrating like a speaker, and the gap is of a wavelength that reproduces a high pitched tone. It is in not harmful to the monitor.
Q. Why do I hear a "purging" or "humming" sound when I first turn on the monitor?
A. The sound you hear indicated that the automatic degaussing process. Every time the monitor is turned on, it will go into this degaussing cycle which helps to eliminate purity problems.
Q. The power light on the monitor is working but there is no picture on the screen.
A. Turn contrast and brightness to full. If you see a faint gray color appearing on the screen, the monitor is functioning properly but not receiving any signal from the video card. If you do not see a faint gray color contact Technical Support for assistance.
Q. I have a splotch of color in a corner of the display. What can I do?
A. The CRT has picked up a bit of magnetism which is causing a purity problem. Normally, the internal automatic degaussing circuit, which operates each time the monitor is powered on, will clear this up.
If this does not clear up the purity problem look for source of interference such as speakers or anything with a magnet, transformer or motor in it (Electric clock, cordless phone charging base, etc.) and move it away from the monitor. If you see a reduction in the effect at that time, you have located the source of the problem.
Once you have removed the source of the interference press the manual degauss button on the front of the monitor. Repeat the application, if needed, about once every ten minutes (the degauss circuitry needs time to recharge) until the discoloration has cleared up. When you press the manual degauss button, you will observe a wobble of the picture for about one second, letting you know the degaussing circuit is working. If repeated attempts do not clear up the discoloration, a Service Technician can manually degauss the CRT with a special device just for this purpose.
Q. Why do the characters in the corner of the screen look fuzzy?
A. Because CRTs are not perfectly spherical and the electron gun is not located at the end of the ovaloid described by the surface of the CRT the focus on the screen will not be uniform. Circuitry in the monitor or the design of the CRT compensates for some of this variance. The monitor is adjusted so that the focus is best in an area around the center.
Click Here to continue to the damage claim form.
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