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CRT Display Degaussing

Until recently, most computer displays used a Cathode Ray Tube (CRT). A CRT consists of a glass vacuum tube with three electron guns (one for each color; red, green, and blue) at one end, and a phosphorous coated screen at the other end. Where an electron beam hits the screen, the phosphorous glows, creating the image on the screen. Today most computers use liquid crystal display (LCD) technology for their displays, but there are still many CRTs around, and they are covered in the CompTIA A+ certification exam.

Inside CRT

  1. Electron guns
  2. Electron beams
  3. Focusing coils
  4. Deflection coils
  5. Anode connection
  6. Mask for separating beams
  7. Phosphor layer
  8. Close-up of inner side of screen

In the CRT a deflection coil is used to steer the electron beam to a specific point on the screen. Gradually magnetic fields build up that cause color impurity on the screen. Degaussing, named after Carl Friedrich Gauss, is the process of removing an unwanted magnetic fields. Most CRTs have a copper coil wrapped around the front of the display, used as a degaussing coil. Tubes without an internal coil can be degaussed using an external hand held version.

Most modern CRTs have buttons on the front of the monitor to adjust the image settings. Pressing the Menu button will bring up a menu of adjustments that you can make to the monitor. If color impurity occurs, press the Menu button and select the item with the magnet icon to degauss the screen. The actual degaussing process will temporarily distort your screen.

More Computer Anatomy Articles:
• Build Your Own Computer
• Anatomy of a Hard Drive
• ABC's Of DVD Drive Abbreviations
• A Guide To Building Your Own PC
• How to Choose a Computer Case
• The Universal Serial Bus
• Wireless USB
• Hard Drives - ATA versus SATA
• Intel Chipsets
• Understanding Your Motherboard

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