,BT4310,太难修了-家电-数据之家

今天接修了一台背投,型号:康佳BT4310,就是散焦,图象和声音都是有的.我不熟悉背投,很少修的,但是在网上查的资料说要调会聚,我看了本机遥控器KK-Y269B是有那么一个会聚的按键,按照网上查的资料,先给机器热机半小时,然后按遥控"会聚",奇怪的事情发生了,就是所有的按键都失效了,但是图像和声音没有影响,只有把总电源关了从新开机才可以控制.后来试了几次都是这样,,可能是会聚功放HM392-040坏了,引起总线错乱才死机?拆开一看是果然RC79和RC69都烧坏了,这两个电阻是供25V和-25的限流保护电阻,换了两个功放块.开机,提供25V和-25V的电源板,有轻微的支支声,光珊也缩小很多,几秒后电源停止供电,好像是过流造成副电源保护.再开机又这样.奇怪,我已经换了两对功放了还是这样.不可能又烧了,检查限流电阻没事.查25V和-25V的电容对地电阻是:黑笔接25V的+极,红笔接地,阻值无限大.黑笔接地,红笔接-25V的-极居然有几十殴姆.请问正常吗?是不是这样导致电源过流保护?功放块的旁边大电阻都没事.也没有什么三极管之类的半导体,现在不知道查哪里了.
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顶一下期待有高手来转转
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D`````````````````````````怎么没人说话?
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再D````````````````````````````````````````````
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找图纸吧
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副25V有问题哦、、、、、、、、
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时隔多年,再顶一下````````````````
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KK-Y269B 遥控器不知道哪里有卖的啊我正好有一台这款背投在修理
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黑笔接25V的+极,红笔接地,阻值无限大.黑笔接地,红笔接-25V的-极居然有几十殴姆----什么表测量？
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有点怪~~~~~~~~~~~~~~~~~~~~~~~

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