Troubleshooting, Maintaining, and Repairing PCs / Edition 4 available in Hardcover
ur PC problemsfrom motherboard conflicts and power supply issues to error codes and virus symptomsquickly and thoroughly with this compr ehensive troubleshooting reference. Fully updated and expanded, this n ew edition covers the latest technologies and peripherals, including D VD drives and GHz processors. By using the well-organized "Symptoms-at -a-Glance" section, you'll be able to locate reliable solutions to com mon and little-known PC problems and reduce system downtime. This esse ntial volume also contains all the material covered on the A+ and CST certification exams and includes a CD-ROM packed with more than 120 re ady-to-use tools and utilities. This is the most authoritative and com plete PC resource available.Learn to:Troubleshoot hard drives and memo ry systemsIdentify and replace damaged and faulty componentsDecide whe n it's cheaper to replace than repairUnderstand operating systems and the boot processKnow what's wrong immediately with more than 2000 "Sym ptoms-at-a-Glance"Enhance system performanceInterpret beep codes and o ther error messagesInstall upgrades and new peripherals
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Read an Excerpt
Chapter 2: An inside Look at MonitorsThe ability to display images and information has evolved right along with CPUs, memory, hard drive space, and all of the other computer attributes that we associate with PC performance. Although the essential principles of a monitor have remained virtually unchanged, the small, drab monochrome displays of just a decade ago have been almost entirely replaced by flicker-free, high-resolution monitors capable of producing photo-realistic color images (Figure 2-1). Today's monitor is more than just an output device-it has become our window into the complex virtual world created by computers. This chapter shows you what is inside the typical color monitor and provides some guidelines for monitor disassembly and reassembly.
As you can see from Figure 2-2, a typical computer monitor is not terribly complicated. Compared to notebook computers and low-profile desktop systems, the monitor assembly is spacious. This is not an accident-monitors require substantial amounts of energy for operation. Much of this energy is dissipated as heat. Extra space prevents a buildup of heat from damaging the monitor's circuitry, and heat is allowed to escape through ventilation slots in the enclosure. Another reason for ample enclosure space is to ensure ample high-voltage insulation. Some monitors generate up to 30kV during normal operation (sometimes more for very large monitors), and normal plastic-wire insulation is hardly sufficient to ensure safety. High-voltage insulation and plenty of unobstructed space keep high voltage from arcing to other circuits. The typical monitor can be broken down into five sections: the enclosure, theCRT, a CRT drive board (or video drive board), a raster drive board, and a power supply.
Monitor enclosures are built as two pieces. The front enclosure (3 on Figure 2-2) is used to mount the CRT and degaussing coil. This is bolted to a frame (12), which forms the base of the monitor. Once other circuit boards are attached to the frame, the rear enclosure (17) forms a shroud over almost all of the monitor. In most cases, the rear enclosure can be freed by removing four screws (18). A few monitor enclosures are held together by plastic latches in addition to screws. If the rear enclosure does not slide away easily, suspect the presence of snap-in latches or extra screws installed into the frame from the bottom.
Although color monitors rely on extra video circuitry to process color signals, it is the design and construction of the CRT itself (CRT in Figure 2-2) that really makes color monitors possible. The basic principles of a color CRT (Figure 2-3) are very similar to a monochrome monitor: electrons "boil" off the cathode and are accelerated toward the phosphor-coated front face by a high positive potential. Color CRTs use three cathodes and video control grids-one for each primary color. Control (brightness), screen, and focus grids serve the same purpose as they do in monochrome CRTs. The control grid regulates the overall brightness of the electron beams, the screen grid begins accelerating the electron beams toward the front screen, and the focus grid narrows the beams. Once the electron beams are focused, vertical and horizontal deflection coils (or deflection yokes) apply magnetic force to direct the beams around the screen...
Table of ContentsAn Inside Look at Desktops and Towers.
An Inside Look at Monitors.
An Inside Look at Operating Systems and the Boot Process.
Arranging the Preservice Checkout.
CD-ROM, CD-R, and CD-RW Drives.
CPU Identification and Troubleshooting.
Data Recovery Techniques.
Disk Compression Troubleshooting.
Drive Adapters and RAID Basics.
Enhancing System Performance.
Fans and Cooling Devices.
Floppy and LS-120 Drives.
Floppy Drive Testing and Alignment.
Joysticks and Game Ports.
Mice and Trackballs.
Modems and Fax Cards.
Monitor Testing and Alignment.
Overlay Software Troubleshooting.
Parallel Port Troubleshooting.
Plug-and-Play Configuration and Troubleshooting.
Power Supplies and Power Management.
Most Helpful Customer Reviews
This book offers great guides to fixing those everyday gliches in the PC world. The price is a little out of range but well worth the cost.