The subject innovation relates to a after-image prevention apparatus of a television CRT, and more specifically, relates to a residual image prevention apparatus of a television CRT to be charge is charged in the CRT after the power of the television is off to prevent the residual image appearance phenomena screen is glowing as a gray will be.; Preventing an afterimage of a television CRT of the present invented apparatus, R, G, and video output circuit 2 for outputting a B image signal, the video output circuit (2) CRT (6 for outputting a signal to the image output from the ) and, in the television, including a flyback transformer (4) with the terminals (a, b) for applying a high voltage to the CRT (6), a microcomputer 16 for controlling the entire stroke, the high pressure on the CRT as being connected in parallel with the terminals (a, b) of a flyback transformer (FBT) for supplying power comprises an after-image prevention device 10 including switching means 12 and the current limiting means 14, the microcomputer 16, the to when the power of the TV off by turning on the switching means (12) discharging a voltage charged to the CRT (6) and when the power is turned on and off by the switching means 12, a flyback transformer (4) from is characterized in that a high voltage is adapted to be supplied to the CRT (6).
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