一台长城TJC—371彩电,图像中缺少绿色,检查发现解码集成电路TA7193P内部G—Y矩阵电路损坏,致使其第①脚无电压输出。由于TA7193P其余各脚均正常,根据G—Y色差信号形成的原理(即它是由R—Y、B—Y按一定比例合成的),可外接电路应急修 A Great Wall TJC-371 color TV, the image of the lack of green, check the decoding integrated circuit TA7193P internal G-Y matrix circuit damage, resulting in the first leg voltage output. As the rest of the TA7193P feet are normal, according to the formation of G-Y color difference signal principle (that is, it is by R-Y, B-Y synthesized by a certain percentage), external circuit emergency repair