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本文以海信TC2lll型彩色电视机为例,介绍LA7680单片机芯彩色电视机的维修。1.开机,“黑屏”重点提示:“黑屏”是指只有字符显示而没有光栅,或亮度、对比度达到最大时只有暗淡的白光的故障现象。这也是海信A3机芯彩色电视机中较为典型和特殊的现象。这是由于海信A3机芯彩色电视机亮度信号钳位所需要的脉冲信号来自行、场同步分离电路分离出来的行同步脉冲,而行、场分离电路所需要的视频信号是从LA7680的輧輱訛脚进入的。
In this paper, Hisense TC2lll color television sets, for example, introduced LA7680 monolithic movement of color TV repair. 1. boot, “black screen ” Important Note: “black screen ” refers to only the characters are displayed without grating, or brightness, contrast only reached the maximum bleak white fault phenomenon. This is also a typical and special phenomenon in the Hisense A3 color TV. This is due to Hisense A3 core color TV brightness signal clamping pulse signal from the line, field sync separation circuit separated from the line sync pulse, and line, field separation circuit required video signal from the LA7680 輧 輱Correct foot entered.