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我的接收机电源板坏了,电源板前半部分和上图基本相同,一开始发现芯片烧了换上芯片又发现D8击穿后来又发现四个整流二极管烧了两个,全都换上后还是不行,输出端没有电压输出。我测得B点对地5.8V,C点对地1.3V到芯片FB脚才0.0几v,是不是C点对地应该是5.1V啊,zD1是5.1V稳压二极管,还有个问题不明白是怎么回事,拆下稳压二极管后B点对地电压为30多V,A处也是30多V,再后来,我把A处往右的那根粗线断开,量的A处对地电压是100多V,真是把我搞蒙了,R2R3量着也没事啊,分别是330K,哪位高手开导开导小弟啊,看看是哪出问题了啊,应该怎么排查,先谢谢了! [此贴子已经被作者于2010-11-2 21:22:03编辑过]
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8 个讨论
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开始图片没有显示,不好意思啊,现在好啦 |
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大家帮帮忙啊
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无图怎么看啊
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