调节对比度有作用,但始终很淡,看测试卡信号时能看出图象拉毛刺,测N100的对比度控制脚电压,在调节对比度时变化正常.无意间手碰到R312电阻,拉毛刺现象消失,经查,发现C311接地端铜铂隐裂,连接好后拉毛刺现象消失,对比度也恢复正常. |
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