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| Security Monitor FAQ: | `WE'RE ALL ABOUT SERVICE AND HELP' | |
Ten most common (CC-TV) monitor failures and causes: 1. Horizontal line or collapsed horizontal display. Vertical deflection circuit failure. 2. Vertical line down middle of screen. Horizontal deflection circuit failure. 3. Power light flashes off and on. High voltage failure, low voltage supply failure, or open or shorted components on main circuit board. 4. Unit powers up then shuts down or goes into power save mode. See #3 5. Colors washed out or bright display with raster lines across the screen. High voltage has drifted. 6. Out of focus. Focus needs to be adjusted, CRT needs to be restored, or flyback transformer has weakened. 7. Wrong colors. One or more color circuits are defective, defective signal cable, or poor soldering connections. 8. Dim display. Defective or weak CRT caused by age and/or over intensifying. 9. Picture rolls up, down, side to side, or loss of one or more colors, or no video at all. Bent or broken signal cable connector pins. 10. No video. Loss of vertical or horizontal sync signals, weak CRT, no high voltage, or defective video controller card.
`Let us Introduce You' |
What size is your monitor? To determine the size of your monitor measure the screen from corner to corner and add one inch. If you measure 13.8 inches then your monitor is a 15 inch model. This is the industry standard for specifying monitor models. The number refers to the size of the picture tube and not the viewable area. What is the actual viewing advantage of a larger monitor? A 15" monitor is fine for viewing web sites in either 640 by 480 or 800 by 600 mode. If you want to view a larger portion of a web page, however, 1024 by 768 is much better and convenient. Therefore a 17" or larger monitor is recommended for this mode, since the viewing area will allow the text and images to be large enough. How many colors can you display? The number of colors that your monitor will display is primarily determined by your video card. A 256K vga board will operate in the 640 by 480 mode with 16 colors. This will make some web pages look very blotchy. Upgrade to 512K and you'll have 256 colors. Photographs on the web look a lot better. If you are running 1024 by 768 mode then you need 1 MB on your video card to get 16 bit colors. What is SVGA? These letters stand for Super VGA which defines video capabilities of 800 by 600 or better. A capability of 1024 by 768 is commonly referred to as XGA. What does Non-Interlaced or NI mean? In order to operate in the 1024 by 768 mode the horizontal sweep frequency has to be 768 times the vertical rate of 60 Hertz. This makes it 46,080 Hertz or sweep lines per second. This is the non-interlaced mode which requires the monitor to be more complex in design than a standard VGA which operates at 31,500 sweeps per second. In order to get around this requirement, monitor manufacturers came up with the interlaced mode where the picture is scanned slower but is painted on the screen in two passes. The net result is that an interlaced monitor will have a tendency to slightly flicker on screens with a lot of white showing like windows desktop. What is the difference between shadow mask and apeture-grille monitors? Shadow-mask monitors are sometimes called dot trio monitors because their design uses phosphor dots arranged in red, green and blue triangles. The shadow-mask name derives from the phosphor dots being separated by a metal mask. Aperture-grille monitors, such as Sony Trinitron and Mitsubishi Diamondtron, use a phosphor coating of alternating red, green and blue vertical stripes instead of triangle dots. Aperture-grille is a more complicated technology and requires 1, 2 or 3 wires be horizontally imbedded in the monitor to act as image stabilizing reference points. Proponents of aperture-grille monitors prefer their brighter colors while detractors point out that the horizontal stabilizing wires are noticeable. In general, shadow-mask monitors are more price-competitive, provide good focus and use a nearly flat surface which reduces distortion. Aperture-grille monitors are less heat sensitive which allows for higher color purity, brighter due to increased phosphor surface and use darker glass which enables increased contrast. What is degaussing? |
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