You are working as a technician at Certkiller .com. A user wishes to have help with removing
some discoloration on her CRT monitor. Which of the following should you do in order to degauss
the CRT monitor?

A.
Run the Windows degauss utility.

B.
Run an electromagnet across the screen while the system is on.

C.
Display an all white picture on the screen for 48 hours.

D.
Run the degauss routine built into the monitor.

Explanation:
Degaussingis the process of decreasing or eliminating an unwanted magnetic field. Monitors use a
metal plate near the front of the tube to focus the electron beams from the back. This plate, the
shadow mask, can pick up strong external fields and from that point produce discoloration on the
display. To minimize this, CRTs have a copper coil wrapped around the front of the display, known
as the degaussing coil. A degauss causes a magnetic field inside the tube to oscillate rapidly, with
decreasing amplitude. This leaves the shadow mask with a small and somewhat randomized field,
removing the discoloration.