| 摘要 |
In a television receiver, a colour picture tube (16) for displaying a colour picture has a signal supply that includes a plurality of primary colour signal channels for supplying a plurality of primary colour signals to the tube (16) and current detecting means (26) connected to the signal supply so as to detect currents flowing through the tube (16) and an automatic white balance circuit (23, 24, 8, 10) for controlling the signal supply in response to the detected currents detected by the current detecting means (26). A power responsive circuit (321) generates a control signal when a power switch for the television receiver is turned on and a blanking circuit (22) connected to the signal supply inhibits the supply of primary colour signals to the tube (16). A first circuit (322) connected to the power responsive circuit (321) actuates the blanking circuit (22) when the power switch is turned on, and a second circuit (323) connected to the current detecting mens (321) deactuates the blanking circuit (22) when the current which flows through the tube (16) exceeds a predetermined value. |
