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彩色电视机为了消除关机亮点,均设有消除亮点关机电路,但是,普通的消除关机亮点电路,对比较严重的关机彩斑故障不能彻底消除,还得在消除亮点电路的基础上采取措施,下面介绍三种有效的方法。 1.延长“中和”时间法例如:有些采用松下M11机芯的彩电在关机后由于显像管的寄生放射等原因,出现关机彩斑故障。有些彩斑可持续很长时间,对此机芯可采用“中和”法,效果较好。对其他类似机芯可供参考。具体方法:如图1所示。将N301(AN5612)⒄脚上的供电电阻R316一端脱开,串入一只整流二极管,然后将滤波电容C313容量加大(最大可加至2200μF),
Color TV in order to eliminate the shutdown bright spots, are equipped with the elimination of bright shut down circuit, but the ordinary circuit to eliminate shutdowns, the more serious off the color spots can not be completely eliminated, have to eliminate the bright spot on the basis of the circuit to take measures, the following Describe three effective methods. 1. To extend the “and” time law For example: Some use of Panasonic M11 movement color TV after shutdown due to CRT parasitic radiation and other reasons, turn off color trouble. Some color spots can last a long time, this movement can be used “neutralization” method, the effect is better. For other similar movement for reference. Specific methods: as shown in Figure 1. Disconnect the power supply resistor R316 on the N301 (AN5612) pin to a rectifying diode and then increase the capacity of the filter capacitor C313 (up to 2200μF)