故障现象:彩色不正常,人物面部呈青色,字符显示是黑色,无信号时无光栅,图像色度能够加大或减小,其他一切正常。检修过程:一开始以为是制式转换电路有问题,但检查相应电路没有发现问题,各部分电压能随制式转换变化,用影碟机送入不同制式信号颜色都一样,先后查遍 TA8690外围所有元件,并代换过 TA8690集成块还是不能解决问题。只好将机子暂时放下,慢慢再说。过了两三天,再次修理该机时,由于 TA8690各相 Symptoms: color is not normal, the character facial blue, character display is black, no grating no signal, the image can increase or decrease the chroma, everything else is normal. Maintenance process: initially thought it was a problem with the standard conversion circuit, but check the corresponding circuit did not find any problems, the voltage can change with the standard system, with the player into the different standard signal color are the same, has searched all the external components TA8690, And replace the TA8690 integrated block still can not solve the problem. Had to put down the machine temporarily, slowly to say. After two or three days, repair the aircraft again, due to TA8690 phase