[backcolor=#ffffff]接修一台三星UA65F9000AJ液晶电视，故障是图像出现红色的水印干扰，操作菜单无发现水印和拖尾现象，把色饱和度调到最低为黑白图像，水印消失，开始怀疑是排线和逻辑板的问题，清洗排线无效，网购了逻辑板，倍频板，排线，逻辑板到屏的屏线，代换了均无效，请教一下各位，这是屏的问题吗？还是主板前级信号处理的问题呢？[/backcolor]
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