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一台夏普2003DK 型彩电,光栅正常,图像很淡、无彩色,几乎看不见雪花噪声点。检修:调节亮度电位器,图像亮度能变化。调节色度和对比度电位器,图像不发生变化。根据故障现象,判断是对比度和色度控制电路发生故障。根
A Sharp 2003DK color TV, grating normal, the image is very light, no color, almost no snow noise point can not be seen. Overhaul: adjust the brightness potentiometer, image brightness can change. Adjust the chroma and contrast potentiometer, the image does not change. According to the fault phenomenon, the judgment is that the contrast and chrominance control circuit malfunction. root