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That looks like a damaged shadow mask/aperture grill to me. The aperture grill, which functions exactly the same as a shadow mask, must be in exactly the right position to work. The heavy metal frame that's needed to keep the drill wires under tension is very heavy and easy to knock out of position. A degaussing problem usually results in a pattern of concentric circles. It's easy to drop a set with enough force to move the shadow mask out of position and not damage the cabinet. Try unplugging the degaussing coil and manually degaussing it.
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