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三、常见故障检修实例例1 故障现象:开机后屏幕光栅为红棕色,随即光栅颜色消失,将对比度开至最大也无图像,但伴音是正常的。分析检修:由现象分析故障出现在亮度信号通道电路。该机亮度信号通过R_(274)、VL_(831)、R_(273)、C_(129)由IC_(401)(TDA3560)的第⑩脚输入,然后经过IC_(401)内部的亮度信号放大器放大后进入R、G、B矩阵电路与色度信号混合。由原理图可以看出,亮度信号在其通道
Third, a common troubleshooting example Example 1 Symptom: After turning on the screen raster is reddish brown, then the color grating disappears, the contrast to the maximum no image, but the sound is normal. Analysis and Maintenance: Analysis of the phenomenon by the phenomenon appeared in the brightness of the signal channel circuit. The luminance signal of the aircraft is input from the ⑩ pin of IC_ (401) (TDA3560) through R_ (274), VL_ (831), R_ (273) and C_ (129) and amplified by the luminance signal amplifier inside IC_ (401) After entering the R, G, B matrix circuit and chrominance signal mixing. As can be seen from the schematic, the brightness of the signal in its channel