飞利浦HD11彩超显示器行场不同步故障检修实例

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                    <p><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);"><img data-s="300,640" data-type="jpeg" src="http://mmbiz.qpic.cn/mmbiz_jpg/dx3KibwtDhvcYTHx7c3ajIw2k0jIor3G2ehsKsrEuWXwOj61vBGo7DicPicln5AgyDK4Fr5zeofvo3mSicXoGMibJ2A/0?wx_fmt=jpeg" data-ratio="1.1677966101694914" data-w="590"  /><br  /></span></p><p><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">故障现象:</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 彩超屏幕开机后行、场均不同步。</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">分析与维修</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 引起该故障现象的主要有2个</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; (1)彩超主机图像控制板输出的彩色信号不正常；</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; (2)显示器信号处理通道有故障。</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 彩超主机图像控制板输出的彩像信号主要有2路，一路为RGB彩色信号输出，一路为RF信号输出。使用示波器观察彩超内部图像控制板输出的彩色信号，经与设备所附资料相比较，未发现异常，因此初步断定其故障位于显示器上。</span><br style="max-width: 100%; word-wrap: break-word; color: rgb(68, 68, 68); font-family: Tahoma, Helvetica, SimSun, sans-serif; font-size: 14px; line-height: 19.0909px; white-space: normal; box-sizing: border-box !important; background-color: rgb(255, 255, 255);"  /><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);">&nbsp; &nbsp; 因该种型号彩超的显示器位于机箱内，故拆卸较为麻烦。打开机箱将显示器信号处理板暴露于维修视野下，顺着彩色信号通路查找，怀疑位于同步回路中的集成电路LM1881有问题，经查询知该集成电路为同步信号分离专用电路，将实际测量的数据与网上资料相比较，发现该集成电路已损坏，更换该集成电路块后，故障排除。</span></p><p><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);"><br  /></span></p><p><span style="max-width: 100%; word-wrap: break-word; font-size: 16px; font-family: 宋体; color: rgb(68, 68, 68); line-height: 19.0909px;  box-sizing: border-box !important; background-color: rgb(255, 255, 255);"></span></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-family: Arial, Verdana, sans-serif; font-size: 14px; line-height: 24px; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(249, 249, 249);">广州市设备维修有限公司</span></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">地址：广州市天河区银利街银利茶叶博览中心E栋4楼E4030室 &nbsp;&nbsp;</span><span style="font-size: 14px; line-height: 1.75em;">&nbsp; &nbsp;&nbsp;</span></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="font-size: 14px; line-height: 1.75em;">邮编：510507</span></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">电话：(+86)020-8722 8723 &nbsp; &nbsp;8764 5360 &nbsp; &nbsp;8764 2943 &nbsp; &nbsp;&nbsp;</span></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; 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font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><img data-ratio="1" data-type="jpeg" data-w="120" width="auto" src="http://mmbiz.qpic.cn/mmbiz/dx3KibwtDhvfCZvZq5PcthnDKlnnq3AalhbichW77J3B70osicTickklZybNKUZqc44DZ0oaWaHm2p0TaA9478icwPg/640?wx_fmt=jpeg" style="box-sizing: border-box !important; word-wrap: break-word !important; width: auto !important; visibility: visible !important;"  /></p><p style="text-indent: 0em; max-width: 100%; min-height: 1em; color: rgb(62, 62, 62); font-size: 12px; font-family: Arial, Verdana, sans-serif; line-height: 1.75em; box-sizing: border-box !important; word-wrap: break-word !important; background-color: rgb(255, 255, 255);"><span style="max-width: 100%; font-size: 14px; box-sizing: border-box !important; word-wrap: break-word !important;">维修咨询：QQ: &nbsp;712638 404</span></p><p style="text-indent: 0em; max-width: 100%; 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