“无光栅”是指在亮度、对比度及色饱和度均调至最大状态时,屏幕上无扫描光栅或仅有字符显示的“黑屏”故障现象。 由于遥控彩电有无正常的伴音,除与伴音处理电路正常工作外,还与行扫描电路输出到微处理器的行逆程脉冲信号是否正常、微处理器控制电路和静音控制电路及伴音处理电路供电等电路是否正常有关,因此由伴音正常,可初步判 “No raster” refers to the phenomenon of “black screen” with no scanning raster or only characters displayed on the screen when the brightness, contrast and color saturation are adjusted to the maximum. Due to the remote control color TV with normal sound, in addition to the sound processing circuit with the normal work, but also with the line scan circuit output to the microprocessor line counter pulse signal is normal, the microprocessor control circuit and mute control circuit and sound processing circuit Power supply circuit is normal, so by the normal sound, can be initially judged