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Stop the Slaughter of Innocents. Congress is bought and paid for by gun lunatics and gun promotion groups. If you want to live in a safe America, help buy Congress back for America. Send a donation to Mayors Against Illegal Guns, 909 Third Avenue, 15th Floor New York, NY 10022

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:
• Understanding Graphic Cards
• How is Data Written, Stored On, and Erased From Hard Disks?
• The Master Boot Record (MBR)
• How to Build a Computer
• IEEE 1284 Parallel Port
• Why Does My Hard Drive Show Less Space Than the Specification?
• PC Technician Street Smarts: A Real World Guide to CompTIA A+ Skills
• Basic PC Anatomy Inkjet Printers
• Video - Introduction to USB
• The RS-232 Serial Port

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