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AIWA XP7发热异常

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Post time 2023-10-16 07:56:31 | Show all posts |Read mode

又来麻烦顾老师了,最近收了一台三飞线版本的爱华XP7,我把电容全部更换后,能正常读碟了,但是图中那颗25V 330UF的电容非常热(原厂是6.3V 330UF),10分钟能冒烟,还有那个二极管也非常热,我看SM手册,这颗电容标记的是C419 6.3V 22UF,但是看了几个拆机图,原厂用的就是6.3V 330UUF,想知道是啥问题引起的电容温度异常。

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 Author| Post time 2023-10-16 09:01:18 | Show all posts
这是我更换所有电容后的图片

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Post time 2023-10-16 10:00:37 | Show all posts
Pls check the voltage across the C419. Over-voltage can cause over-heat.
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 Author| Post time 2023-10-16 20:46:10 | Show all posts
kaosun replied at 2023-10-16 10:00
Pls check the voltage across the C419. Over-voltage can cause over-heat.

我在刚关机的时候测量电容两端电压是4.5V,看起来电压正常
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Post time 2023-10-23 10:38:31 | Show all posts
Foxzc replied at 2023-10-16 20:46
我在刚关机的时候测量电容两端电压是4.5V,看起来电压正常

Measure it again when powers on.
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 Author| Post time 2023-10-23 19:29:07 | Show all posts
kaosun replied at 2023-10-23 10:38
Measure it again when powers on.

拆掉电容测试电压,插上电源时电压4.5V,按play键后电压落到4V。
我这几天把这颗电容换了一个,刚装上测试不发热了,以为是电容问题,昨天又闻到异味,打开机盖发现这颗电容非常烫,等机器冷却后,我再次启动听了几分钟,电容又不热了,测试结论是这颗电容有时会发热异常,有时不会,这下更迷茫了。
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Post time 2023-10-30 10:51:22 | Show all posts
It might mean the cap underwent high AC impact. Check whether the voltage is generated by DC-DC circuit, repair this circuit. If you replaced all caps on the motherboard, further clean the whole PCB by alcohol.
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Post time 2024-05-19 07:40:13 | Show all posts
Edited by CLS at 2024-05-19 07:49

下面那个贴片钽电容,丝印是反的,你测一下电压确认
更正:查了一下我的照片,你这个版本没问题

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