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Notes on the Troubleshooting and Repair of Computer and Video. Monitors 1. 99. 4 2. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the. This notice is included in its entirety at the beginning. There is no charge except to cover the costs of copying. Working inside a CRT based computer or video monitor, or television set can. CRT implosion. Read and follow ALL of the safety guidelines found in. Safety Guidelines for High Voltage andor Line Powered. Equipment and the section SAFETY, below. If in doubt about your. We will not be responsible for damage to equipment, your ego, county wide. Back to Monitor Repair FAQ Table of Contents. In the early days of small computers, a 1. Small here, also meant something that. The earliest personal computers didnt come with a display you connected. TV. You and your kids shared the single TV and the. Flintstones often won out. The Commodore 6. 4 would never have been as. However, as computer performance improved, it quickly became clear that. Even for simple text, a TV can only. When the IBM PC was introduced, it came with a nice 8. It was bright, crisp, and stable. Mono graphics MGA or MDA. CGA at a range of resolutions from 1. EGA extended this up to a spectacular resolution of. This was really fine until the introduction of Windows well, at. Windows stayed up long enough for you to care. All of these displays used digital video TTL signals which coded for a. Both the video. adapter and the monitor were limited to 2, 4, 1. The video signals were logic bits 0s. With the introduction of the VGA standard, personal computer graphics. VGA and its successors PGA, XGA, and all of the SVGA. R, G, and B signals is. In principle, an analog monitor is capable of an unlimited. In practice, unavoidable noise. CRT restricts the actual number to order of 6. Note that analog video was only new to the PC world. TVs and other video. PCs discovery of this approach. In. all fairness, both the display adapter and monitor are more expensive so. PCs did not use analog video. Most of the information in this document applies to color computer video. TV studio monitors as well as the display portions of television. Black and white, gray scale, and monochrome monitors use a subset. For most descriptions of symptoms, testing, diagnosis, and repair, an. PC SVGA monitor is assumed. For a fixed frequency workstation. TV monitor, only a subset. Note we use the term auto scan to describe a monitor which accepts a wide. Usually, this refers mostly. Fixed scan or fixed frequency monitors are. Multi scan monitors sync at two or more distinct. While not very common anymore, multi scan monitors may still. See the documentss. Troubleshooting and Repair of Small Switchmode Power. Troubleshooting and Repair of Television Sets for additional. Since a monitor must perform a subset of the functions. TV, many of the problems and solutions are similar. For power related. SMPSs may be useful as well. If you are considering. Performance Testing of. Computer and Video Monitors. Note throughout this document, we use the term raster to refer to the. Monitors designed for PCs, workstations, and studio video have many. Modern computer monitors share many. TVs but the auto scan and high scan rate deflection. Currently, most inexpensive computer monitors are still based on the Cathode. Ray Tube CRT as the display device. However, handheld equipment. Liquid Crystal Displays LCDs. These are. a lot less bulky than CRTs, use less power, and have better geometry but. As the price of LCD and other technology flat. CRT based monitors will eventually go the way of. However, there are still problems with low cost, at least LCD monitors. First, the picture quality in terms of gray scale and color is generally. The number of distinct shades of. They are generally not as. CRTs when it comes to real time video which is becoming. This is partly due to. LCD material itself but also a result of the scan. Brightness. is generally not as good as a decent CRT display. And last but not least. It is really hard to beat the simplicity of the. CRT. The really bad news from the perspective of repair is that they generally. LCDdriver. panel, if not the entire monitor. Only repair of the most simple problems. Access to the. backlight lamps might substantial disassembly. Buying a broken LCD monitor to repair may have better odds than the. State Lottery, but probably not by much. Where one or more columns or. I wouldnt. consider it unless nearly totally free, hoping for a miracle, and even then it. Loose connectors and solder joints are possible. CRT monitors. Also a note to those with less than perfect vision If you tend to view your. LCD monitors. The appearance of a CRT. But for an LCD display. Only the central part of your field of vision will have. If. the curser isnt within this central area, it will be harder to locate than. CRT. In short, dont just depend on the hype. An LCD with a slightly. Test. drive multiple LCD monitors before committing to oneNonetheless, a variety of technologies are currently competing for use in. Among these are advanced LCD. Only time will tell which, if. Projection displays, on the other hand, can take advantage of a novel. Texas Instruments Inc. Digital Micromirror Device DMD. This is basically. RAM cell. DMD technology would. HDTV as well as PCs. Since it is a reflective. This technology is. TV sets yet. As noted, the plasma panel flat screen display has been around for several. TVs, typically in the 4. But. they are very expensive 5,0. Winter, 2. 00. 3, and their. CRT. The physical resolution. However, there is little doubt that this or a similar. CRT and 3 tube projection. TVs in the mid to large screen sizes in the not too distant future. Cage The Elephant Discography Zip there. But to. what extent it is used for computer monitors is still unclear. The remainder of this document concentrates on CRT based computer and video. I wouldnt recommend any sort of. TVs or monitors no matter what the size. The chance of success is vanishingly small and its very likely. The following describe the capabilities which characterize a display. Resolution the number of resolvable pixels on each line and the. Bandwidth of the video source, cable, and. CRT focus spot size are all critical. However, maximum resolution on a color CRT is limited by the dotslotline. CRT shadowslot mask or aperture grille. Refresh rate the number of complete images painted on the screen. Non interlaced or progressive scanning posts the entire. Interlaced scanning posts. This interleaving reduces the apparent flicker for a given. TV. It is. usually not acceptable for computer graphics, however, as thin horizontal. Refresh rate is the. CRT phosphors are also a consideration. Long persistence. Vertical scan rate is equal to the refresh rate for. Non interlaced vertical refresh rates. Hz are considered desirable for computer displays. Television. uses 2. Hz frame rate interlaced scanning in most countries. Horizontal scan rate the frequency at which the electron beams move. The horizontal scan rate is often the limiting factor. It is what may. cause failure if scan rate speed limits are exceeded due to the component. Color or monochrome a color monitor has a CRT with three electron. Nearly all visible colors can be created from a mix of primaries. A monochrome monitor has a CRT with a single electron gun. However. the actual color of the display may be white, amber, green, or whatever. CRT selected. Digital or analog signal a digital input can only assume a discrete. A single bit. input can only produce two levels usually black or white or amber. Four bit EGA can display up to 1. Analog inputs allow for a theoretically unlimited number of possible gray. However, the actual storage and digital to analog. CRT and ultimately, limitations. However, very high performance digital video sources may have RAMDACs DA. While it is not possible to perceive this many distinct gray. RAMDAC. to compensate for the unavoidable non linearity of the CRT phosphor. Investopedia Sharper Insight. Smarter Investing. Find the best broker for your trading or investing needs.