故障检修:黑白图像与伴音正常,但无彩色。分析与检修:根据故障现象首先将电视机置于TV状态接收有线电视信号,调色饱和度至最大,屏幕色标及字符显示正常,制式也正确,但无彩色。从AV音视频口输入VCD信号,图像、声音正常,还是无彩色。如果从AV输入有彩色,说明故障在高频及中频电路中,由此已初步排除高、中频电路。该机色度信号处理电路 Troubleshooting: black and white images and sound normal, but no color. Analysis and Overhaul: According to the fault phenomenon, the TV is first placed in the TV state to receive the cable television signal, the saturation of the color saturation is maximized, the screen color code and characters are displayed normally, the formula is correct, but no color. From the AV audio and video input VCD signal, the image, the sound is normal, or no color. If the input from the AV color, indicating that the fault in high-frequency and IF circuit, which has initially ruled out high and intermediate frequency circuit. Machine color signal processing circuit