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海信LED48K20JD 开机黑屏 求助

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Post time: 2022-2-12 15:39:36
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本帖最后由 天鸿电脑 于 2022-2-12 16:30 编辑

海信LED48K20JD 开机黑屏 求助
接修一台海信LED48K20JD 开机黑屏
上电红灯亮,开机后蓝灯亮,屏幕无显示,无开机启动声音LED灯条上测试,插座无电压(去年换过一次灯条,全换的新的,当时是一个灯珠开路了,灯条插座电压有230V),开机时主板来的SW信号一直为0V ,但开机时(蓝灯亮)PWM电压为2.8V,STB脚开机时(蓝灯亮)为3.5V ,关机时为0V,
上电后不管蓝灯还是红灯,200V处始终为78V   18V和12V正常
上电后不管蓝灯还是红灯,逻辑板供电始终为0V
感觉是主板没启动,有点疑惑的是遥控开关机指示灯是有变化的

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Post time: 2022-2-12 21:27:16
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SW悬空STB接SW开机背光就会亮,图像正常检查SW电路,如灰屏或卡LOGO可升级主程序试试
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 Author| Post time: 2022-2-13 11:27:04
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多谢回复,现已修复,用U盘刷机已经全部修复,原机是L ED48K20JD(1011)版本的没找到找了个0011的程序,居然也成功了

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Post time: 6 day(s) ago
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天鸿电脑 2022-2-13 11:27
多谢回复,现已修复,用U盘刷机已经全部修复,原机是L ED48K20JD(1011)版本的没找到找了个0011的程序,居然也成功了

用的哪一个链接。谢谢
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 Author| Post time: 5 day(s) ago
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一问三不知 2022-9-22 17:43
用的哪一个链接。谢谢

链接:https://pan.baidu.com/s/1XgH7ZaUrT3WIesLpMK34HQ
提取码:syza
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