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求解液晶电视高压板假负载怎么安装？

求解液晶电视高压板假负载怎么安装？

浏览：44次 | 提问时间： 07-10 10:12

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女人無情便是王 07-10 10:13

液晶电视高压板假负载负责给LCD的灯管供电，它将直流低压电源变换为高频高压电源以点亮灯管，属于功率变换器件，易发热，所以比较容易坏。有很多客户的屏暗了，急得不得了，以为屏坏了，或是主机出了毛病，到处抓方问药，殊不知就是一个小小的高压板坏了！实际上，高压板就是一个开关电源，只不过相对于普通的开关电源来说，它少了后级的整流滤波部分，而侧重于高频高压的变换。

初相遇 07-10 10:21

液晶电视高压板假负载安装方法：
1.短接法----一般情况下，脉宽调制 IC中有一脚是控制或强制输出的，对地短路该脚则其将不受反馈电路的影响，强制输出脉冲波，此时升压板一般均能点亮，并进行电路测试
2.对比测试法：因液晶显示器灯管采用均为 2个以上，多数厂家在设计时左右灯管均采用双路输出，即两个灯管对应相同的两个电路，此时，两个电路就可以采用对比测试法，以判定故障点位！当然，有的机子用一路控制两个灯管时，此法就无效！另一方面，在不明情况下，最好不要乱短路 IC各脚，否则可能会出现异想不到的后果

圈子不同我不硬容俯身三世朦胧梦 07-10 10:30

液晶电视高压板假负载安装方法；先找到电源板上的开/关机端ON/OF、STB、POWER等，用一只1K~2K电阻与+5VSB相连接，让开关电源进入工作状态。能找到开/关机单独控制三极管，将三极管C、E极短接风格进行强制开机。在12V输出端上接一只20~47R/10W的电阻或者12V10W灯泡作假负载。

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