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阅《家电检修技术》杂志2003年9期孙铁强先生的《场输出电路异常为什么会引发“字符”和“黑屏”故障》一文,深有感触,在此谈谈自己的看法。场输出电路反馈给CPU的场同步(场逆程脉冲)信号是一个极其重要的信号,其用途有四:(1)用于字符在荧光屏上的垂直定位;(2)用于产生字符处的消隐信号,也就是显示字符时将字符后面的图像信号消隐掉;(3)用于场消隐信号,使在场逆程期间色度/视频/扫描集成电路的R、G、B信号输出端输出低电平(显像管栅极控制亮度的彩电不是这样)让末级视放管瞬间截止,从而完成场消隐任务;(4)作为部分CPU正常工
Read the “Appliance Maintenance Technology” magazine 2003 9 Mr. Sun Tieqiang “field output circuit anomalies cause” character “and” black screen “fault” deep feeling, here to talk about their own views. The field sync (field back-pulse) signal fed back to the CPU by the field output circuit is an extremely important signal for four purposes: (1) for vertical positioning of characters on the phosphor screen; (2) for use in generating characters Blanking signal, ie, blanking the image signal behind the character when displaying the character; (3) outputting the R, G, B signals of the chrominance / video / scan integrated circuit during field reversal End output low (CRT tube brightness control of the TV is not the case) so that the end of the tube as an instant cut-off tube to complete the field blanking task; (4) as part of the normal CPU