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[求助]长虹PT32618(SP22等离子)Y板15V电压马上回落到4.5V?

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Post time: 2019-8-5 15:22:23
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本帖最后由 王绍恩 于 2019-8-5 15:48 编辑

一台长虹PT32618(SP22等离子)电视机原故障是Y板Q381 Q392 Q393击穿,Q383击穿,Z板的Q181 Q182击穿,D121击穿短路,更换后能开机有声音但无背光,测VS电压193V及Va电压63V都有正常输出且稳定,5V电压也正常,只有15V开机时有但马上回落到4.5V,短接R439去掉保护,有15V电压了但连声音也没有了,,再检测Z板Q181 Q182击穿又击穿了,请教师傅们应该怎么检修,先谢谢了!

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Post time: 2019-8-5 16:49:45
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这个板子坏 通病 散热片下面的贴片电阻虚焊   造成炸机短路  
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 Author| Post time: 2019-8-5 17:40:20
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谢谢二楼回贴!去保护后就烧Z板场效应管及D121开路,是不是屏坏引起15V保护,测VS及VA电压都有,更换好坏件后伴音都正常,要是屏坏就不敢再买Y板Z板了,要一百多元一套,烧点管子总还好呵呵,

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 Author| Post time: 2019-8-11 12:00:54
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胡家进 2019-8-11 09:56
缓冲芯片可能坏了.

谢谢你的回复!缓冲芯片外观看不出有坏或炸裂。
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Post time: 2019-8-12 08:35:55
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王绍恩 2019-8-11 12:00
谢谢你的回复!缓冲芯片外观看不出有坏或炸裂。

你修机是凭看外表吗?
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 Author| Post time: 2019-8-12 09:08:39
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胡家进 2019-8-11 09:56
缓冲芯片可能坏了.

谢谢胡家进师傅!那换Y板用户接受不了,就20元回收做备件或玩玩了。
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Post time: 2019-8-13 14:17:45
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王绍恩 2019-8-12 09:08
谢谢胡家进师傅!那换Y板用户接受不了,就20元回收做备件或玩玩了。

这Y板也不贵,如果觉得贵你修下也可以呀,总之要解决问题!
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