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There is an irregular splotch of color on the screen, visible especially when a white background is displayed
Explanation: A stationary part of the screen appears discolored. When a solid white image is displayed on the screen, this part of the screen appears colored, and the color and position stay constant over a period of time. This is more likely to occur at a corner or edge of the screen.
Diagnosis: This problem is caused by magnetization of the metallic elements (in particular, the shadow mask or aperture grill) in the surface of the CRT screen. The magnetic fields cause the electron beams that comprise the picture to be distorted, causing colored areas to appear on the screen. The magnetization normally occurs from interference created by an electromagnetic device, but can also occur if the monitor is shocked or moved suddenly. The screen must be degaussed to get rid of the pattern. Degaussing is the process of demagnetizing the surface of the CRT screen.
Warning: Do not degauss
the monitor many times in rapid succession, as this may cause damage to the degaussing
circuit on some CRTs.