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康佳LED42MS11DC 电源板34007620问题请教

2025-03-16 14:31:28

推荐回答（3个）

回答1：

呵呵没有要你换PFC芯片，是防止PFC芯片VCC对地短路，在加上PFC控制回路异常，5V电源芯片无法正常工作，目前余下的就是5V芯片VCC相关电路了，看看供电回路是否正常。

回答2：

QB903没问题！就不需要带换的！你检测一下QB903的E极对地电阻看是否有明显的短路!我也只是按常规思路猜测的如果正常的话检测断开+5v负载通电试试看+5v是否有了还有就是QB902 QB904相连的那几个元件这个电路有点复杂慢慢检查看看！等一下其它师傅回复的思路都可以参考一下

回答3：

你修这个机子很像被雷击了！你检测一下QB903的E极对地电阻！用指针表！应该有问题！导至副电源保护了所以没有+5V

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