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兰花牌14英寸彩电使用一段时间之后,突然出现“帧压缩”故障,在播音员脸部被压缩一公分左右,形象严重失真。检查主电路板上的帧扫描部分,该机场输出是厚膜电路HM6232,测量它的①脚只有58 V,电原理图上标明是74 V,偏差太大,再测量泵电源开关管Q_(601)的基极和发射极电压都是58 V,由于它的基极和发射极电位相同,造成开关管Q_(601)截止,而使场逆程脉冲幅度减小,所以使荧光屏上部光栅线性变坏了。
Orchid 14-inch color TV brand for some time after the sudden appearance of “frame compression ” failure, the announcer face was compressed about one centimeter, the image of serious distortion. Check the main circuit board frame scanning part of the airport output is a thick film circuit HM6232, measuring its ① feet only 58 V, the electrical schematic marked 74 V, the deviation is too large, and then measure the pump power switch Q_ (601 ) Base and emitter voltage are 58 V, due to its base and emitter potential of the same, resulting in the switch Q_ (601) is turned off, leaving the field reverse pulse amplitude decreases, so the upper screen grating linearly variable broken.