SONY CDP-950 CD机显示屏先是亮度不对，后黑屏不亮

mrliuzhong

SONY CDP-950 CD机显示屏先是亮度不对，后黑屏不亮了，播放CD和别的功能都还正常，请高手支招如何处理，先谢谢了。原来一个SONY CDP-991也是这样子，有高手支招高显示屏的供电不通，换了一个电阻R214，电路通了就好了。这次也请高手指点一下，950的黑屏和前次的故障一样，也可能是显示屏供电的问题吗？请指点是哪个电阻坏了屏供电又不通了呢？

mrliuzhong

怎么没高手出现呢？SONY CD机很多都会出这样的故障，高手把机器的供电部分DIY一下，以求一劳永益

mrliuzhong

我手中用过的机器就有CDP-991，SONY CDP-950都出过这个问题

darkjth

你把电源开关的两组触点短接，取消电源开关，一般故障即可排除。

mrliuzhong

darkjth 发表于 2014-6-26 20:48
你把电源开关的两组触点短接，取消电源开关，一般故障即可排除。

呵，谢谢你，我试一试，这样做是怀疑电源开关触点接触不好吗？可950的电源开关是直接开关220V的吧（在机内我已加了220V转100V的音响专用变压器），机器都通电，播放CD都没问题，只是显示屏黑屏，这样做不知能效没有呀。

zhpt009

屏幕阳极供电的那个-33v  稳压二极管查下看、

南帝

如果是整个显示屏不亮，请检查显示屏的灯丝电压，属于交流供电，大约4.5V，脚位1和2并联，47和48并联。如果是其他字符显示不全或者不显示，请检查:阿拉伯数字部分（第15脚和17脚，依次对应右边的数字），如果是字段部分，请检测第5脚至14脚。然后第24脚至43脚，依次对应a.b.c……s.t

南帝

第5脚至15脚，电压约–27V，第16/17脚约–28.5V，第24脚至29脚电压约–25.5V，第30脚至39脚电压约–29V，第40脚至43脚电压依次对应（大约值）:–23V，–29V，–29V，–17V。

南帝

如果是日系机，使用都是AC100V/50/60Hz，在国内改装都喜欢转AC110V，多出10V，导致显示屏部分容易出问题。

mrliuzhong

zhpt009 发表于 2014-6-26 23:49
屏幕阳极供电的那个-33v  稳压二极管查下看、

多谢了。

mrliuzhong

南帝 发表于 2014-6-27 01:53
如果是日系机，使用都是AC100V/50/60Hz，在国内改装都喜欢转AC110V，多出10V，导致显示屏部分容易出问题。

南帝兄弟真是高手，提供这么多信息，非常感谢

mrliuzhong

南帝 发表于 2014-6-27 01:37
如果是整个显示屏不亮，请检查显示屏的灯丝电压，属于交流供电，大约4.5V，脚位1和2并联，47和48并联。如果 ...

Thank you so much

mrliuzhong

南帝 发表于 2014-6-27 01:53
如果是日系机，使用都是AC100V/50/60Hz，在国内改装都喜欢转AC110V，多出10V，导致显示屏部分容易出问题。

估计是这个问题，电压高了导致的损坏

TAD2401

看看灯丝电压是多少正常大约4-5V.如果高于5V那么就是220转100的变压器选的不正确导致电压过高。这时提供负压的绕组交流电压也会偏高有可能限流电阻或稳压管损坏。（一般的负压电路都是一只二极管整流后加一只限流电阻，然后并一只稳压管。）在有灯丝电压的情况下。如果没负压，主要检查一下限流电阻，和稳压管。如果灯丝电压和负压都正常那就不太乐观了！

mrliuzhong

TAD2401 发表于 2014-6-30 10:30
看看灯丝电压是多少正常大约4-5V.如果高于5V那么就是220转100的变压器选的不正确导致电压过高。这时提供负压 ...

如果灯丝电压和负压都正常那就可以是显示屏坏了吧？这样子就麻烦了

TAD2401

mrliuzhong 发表于 2014-6-30 10:56
如果灯丝电压和负压都正常那就可以是显示屏坏了吧？这样子就麻烦了

显示屏不会轻易坏的。开机后在暗的环境下观察一下灯丝是不是有轻微的发红。（灯丝电压正常的情况下）如果有显示屏坏的可能就不大。那问题就出在显示驱动电路上。就得仔细的找了！

mrliuzhong

TAD2401 发表于 2014-6-30 14:06
显示屏不会轻易坏的。开机后在暗的环境下观察一下灯丝是不是有轻微的发红。（灯丝电压正常的情况下）如果 ...

多谢兄弟指点。

TAD2401

mrliuzhong 发表于 2014-6-30 18:13
多谢兄弟指点。

客气了！互相学习！

mrliuzhong

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TECHNICS SL-P770 2x PCM56P + 2x PCM56P-J
TECHNICS SL-P990 4x PCM56P-J
TECHNICS SL-P1200 PCM54HP
TECHNICS SL-PG480A MN662713
TECHNICS SL-PJ28A MN6477
TECHNICS SL-PS670D MN6474
TECHNICS SL-PS700 MN6474
TECHNICS SL-PS770A MN64733

美国THETA DSP PCM67

法国汤姆逊THOMSON LAD300 TD6720N

THULE CD100 CS4303
THULE SPIRIT PCM1715U

日本TOSHIBA XR40 TD6705AP

UHER UCD-210 LC7882
UNIVERSUM CD4682 PCM56
USHER CD-100 PCM1732

美国怀念WADIA 23 AD1865
WADIA 850 PCM1702
WADIA 860 4x PCM1702
WADIA 861 4x PCM1704
日本雅马哈
YAMAHA CD-2 PCM53
YAMAHA CD-3 PCM53
YAMAHA CD-2000 PCM54HP
YAMAHA CDX-3 PCM54
YAMAHA CDX-410 PCM56
YAMAHA CDX-420 PCM56
YAMAHA CDX-470 YDC103
YAMAHA CDX-480 MN66271
YAMAHA CDX-490 MN66271R
YAMAHA CDX-580 YAC514
YAMAHA CDX-590 YAC514
YAMAHA CDX-593 YAC514
YAMAHA CDX-700 PCM56
YAMAHA CDX-880 YAC514
YAMAHA CDX-900 PCM56
YAMAHA CDX-890 YAC514
YAMAHA CDX-893 YAC514
YAMAHA CDX-993 YAC514F
YAMAHA CDX-1100 PCM56
YAMAHA CDX-2020 PCM58

mrliuzhong

CD机的心脏 解码芯片大解析（参考资料）

http://www.hifidiy.net/39-9035-1.html