我电脑今天再也无法开机,估计是主板上的电容坏了。从前几天开始,我按下电脑机箱的电源就不能启动,屏幕无显示,机箱喇叭不报警,PCI插槽没电。但CPU风扇是转的,PS/2口是有电的,键盘灯和光电鼠标也亮。我让主机开了十多分钟发热,然后再关机开机,能够正常启动。但这个等待主板发热的时间几天来越来越长,到今天再也不能启动了。内存条拔了重插过,CPU在别的电脑测试过是好的,显卡又是集成的,不可能松动。从状况来看,唯一的原因就是昨天我开机12个小时后,电脑主板上的电容被彻底烧坏了。
  电容,作为主板电源模块的最重要作用是滤波。现在的个人电脑的运行速度越来越快,随着CPU主频的提高,再加上耗电量大的显卡、内存等,这些设备对主板的供电要求是越来越严格。为了能让这些设备能够稳定的工作,主板必须要有稳定而纯净的电流供应。从机箱电源出来的电流成分是很复杂的,其峰值电压不稳定,而且开关机会出现浪涌。电容可以把脉动直流变成近似直线的直流,所以在主板上会有不少电容来滤除相关电路产生的杂波,特别在CPU附近,有的主板会有多达10余个电解电容,这是因为CPU工作在几百兆甚至数G的高频下,必须保证电源的绝对纯净,这时就需要使用大容量的电解电容来滤波。大容量的电解电容可以看作是储存电荷的容器,相当于一个水库,在短时间内的大量用电并不会造成电压的骤然下降,从而让主板上的其他设备得以稳定运行。当电解电容的容量下降时,供应CPU工作的核心电压就会变差,其中会窜入周围电路产生的杂波和开关电源电路自身的波形,这时主机就会表现出系统极端的不稳定。
  电容只要十几块钱,关键是我没工具去自己修,用电烙铁怕把主板焊坏了,又不想给奸商N多倍的维修费叫他们去修。打电话告诉了我爸,他说国庆他把家里的那台“奔腾4 2.4G,768M 内存”的电脑搬到长沙,叫我国庆把现在的这台“赛扬1.3G,256M 内存”的电脑搬到长沙,索性换了,让我把家里那台好电脑搬回武汉。至于现在这台电脑,他说带回家看看,能修就修,不能修就不要了,反正这台电脑已经很旧了。
  国庆之前这段时间我没自己的电脑可用,一些东西的开发制作只有等到国庆之后了。另外,这个BLOG的更新时间也少了。

  附:我的技嘉电脑主板上被烧坏的电容示意图

  2005年10月6日备注:老爸今天给我打电话,说他把这台电脑带回家后,用尖嘴电烙铁(插电发热后拔掉电源),换了那几个电容,那台电脑果然恢复正常,证明了我此前的猜测。




电脑杂谈 | 评论(34) | 引用(0) | 阅读(14178)
louis vuitton uk Email Homepage
2011-11-23 09:25
This louis vuitton uk for sale belongs to the sounding just what are termed as Louis Vuitton vintage best sellers, many other products and services for the reason that range appearing companies.You will easily notice the unfold zippers of this coach outlet store online. That is the decoration. There are some inside pockets for you as well. They are easy to match your clothes and to carry.Let us inspire your inner beauty with fine christian louboutin sale. Purse the elegance in bridal wedding. Enjoy the fashion.
Harlin Christian
2012-7-14 10:39
Watches are an perfect allowance replica watches because not by yourself is there a observe out there for everyone, cheap watches abatement into that course of I totally had to yield the time and replica watches uk put in plenty of accomplishment to acquisition you the appropriate one.
Juicy Outlet Email Homepage
2012-7-24 20:49
to this kind of common faces as Adriana Lima Raquel Zimmerman and Amber Valletta Louis Vuitton Outlet
baozang
2012-9-22 11:58
Lamo - Like Sebago, Louis Vuitton Canada  there are only about 40 styles of Lamo Footwear.  Most of their footwear uses a suede leather traditional in True Religion Jeans  moccasins, though only about 1/3 of the footwear collection is a traditional moccasin look. True Religion Brand Jeans The rest of the collection is slippers and UGG styled boots.Louis Vuitton Artsy The traditional moccasins do have a soft rubber sole making them great deck True Religion Sale shoes as well, however. Expect to pay between $50 and $60 for Lamo moccasins.
Replica Handbags Email Homepage
2012-9-24 03:55
while the high class within the schokoutige extention Cheap NFL Jerseys
Zachary Groce Email Homepage
2012-10-6 01:06
Mulberry Outlet Email Homepage
2012-10-23 00:10
Gucci Outlet Email Homepage
2012-10-25 11:57
Uggs Clearance Email Homepage
2012-11-10 06:23
Ugg Boots On Sale Email Homepage
2012-11-14 12:31
Ugg Boots Sale Email Homepage
2012-11-19 05:06
Coach Outlet Store Online Email Homepage
2012-11-21 19:36
Burberry Outlet Email Homepage
2012-11-22 14:46
Moncler Outlet Email
2012-11-24 16:45
Coach Outlet Online Email Homepage
2012-11-24 17:00
分页: 1/2 第一页 1 2 下页 最后页
发表评论
表情
emotemotemotemotemot
emotemotemotemotemot
emotemotemotemotemot
emotemotemotemotemot
emotemotemotemotemot
打开HTML
打开UBB
打开表情
隐藏
记住我
昵称   密码   游客无需密码
网址   电邮   [注册]