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View: 434|Reply: 7

创维 42E320W 不开机

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Post time: 2018-10-11 19:24:49
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电源板版号5800P47ELL-0030 ,开机测量24V一组从19v多一直往下掉,12V组从7V多一往下掉,此时不要关电,只要在24V组上并联一只灯泡,电源立即起来,随后屏幕也正常了,只要有灯泡并联,随时都能打开机,把灯泡取下都打不开,是什么原因,师傅们哪个给份图纸看看
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Post time: 2018-10-11 19:34:29
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存在过电压保护
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 Author| Post time: 2018-10-11 21:13:53
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没有找到图纸,等明天光线好点仔细看看稳压部分,应该是你说的,工作的时候把灯泡取下,测量24v这组有24.5v
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Post time: 2018-10-11 22:29:12
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检查一下电源部分PFC电路
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Post time: 2018-10-11 23:18:10
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Please check related voltages and its' firmware.
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 Author| Post time: 2018-10-13 14:42:28
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在24V这路上并联灯泡,能开启,PFC电容上有387V电压,拿掉灯泡,PFC电压能看到从402V降到372V,当然测量的时候表也有反应时间。
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 Author| Post time: 2018-10-13 14:46:55
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贴片431及周边小电阻都检查了,431也换了,都不好,难修啊,拿下来肯定要带假负载,只要带假负载就正常,是不是难啊
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