A user's CRT monitor was damaged by a large magnet, resulting in a distorted image. Which of the following can a technician do to BEST safely fix the monitor?

Question

Options

• AReplace cathode ray tube
• BPower cycle the monitor
• CRun degaussing tools
• DAdjust monitor's brightness

• A
  3% (2)
• B
  2% (1)
• C
  89% (57)
• D
  6% (4)

Explanation

CRT (Cathode Ray Tube) monitors use electron beams steered by magnetic fields to paint images on the phosphor-coated screen. When a strong external magnet comes near a CRT, it magnetizes the shadow mask and other metal components inside, causing the electron beam to deflect incorrectly - resulting in color distortion, wavy images, or discoloration. Degaussing is the process of applying a rapidly alternating, diminishing magnetic field to demagnetize those internal components and restore proper image quality. Most CRT monitors have a built-in degaussing coil that activates on power-up, but a technician can also use a dedicated handheld degaussing wand for more thorough treatment. Replacing the cathode ray tube (A) is an extreme and expensive measure unnecessary for magnetic distortion. Power cycling (B) may trigger the built-in degauss coil but is less effective than a dedicated tool. Adjusting brightness (D) has no effect on magnetically induced distortion.

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