The technique of correction of convergence in shadow-mask tubes color television such as LG 32LV2400 falls into two parts referred to as static and dynamic convergence.
Static convergence involves the movement of the beams by permanent magnetic fields, which, once correctly set, bring the beams into convergence in the central area of the screen.
Convergence over the rest of the screen is achieved by continuously varying magnetic fields, the instantaneous strengths of which depend upon the positions of the spots on the screen. These fields are set up by electromagnets that carry currents at line and field frequencies.
The separate magnetic fields are needed to allow the three beams to be shifted individually. It is established in the tube by a convergence of yoke assembly that slides over the tube neck. Internal magnetic screening shields divide the neck into three sectors in this region, so that each beam is isolated from the convergence fields of the other two beams.
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