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电脑芯片级维修教材

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发表于 2006-6-26 02:20:00 | 显示全部楼层 |阅读模式

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<p>电脑芯片级维修教材摘自<a href="http://www.eastrepair.com/">www.eastrepair.com</a>东方维修培训,欢迎订购。</p><p>&nbsp;</p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%; TEXT-ALIGN: center;"><b><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">6.5<span style="mso-spacerun: yes;">&nbsp; </span>主板维修实例<p></p></span></b></p><p class="MsoNormal" align="center" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%; TEXT-ALIGN: center;"><b><span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">&nbsp;<p></p></span></b></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">6.5.1<span style="mso-spacerun: yes;">&nbsp; </span>电源部分维修实例<p></p></span></b></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt;">&nbsp;<p></p></span></b></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">1. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一联想<span lang="EN-US">QDI主板,Inter845芯片组,故障为数码卡显FF。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">检修过程:</span></b><span style="FONT-FAMILY: 宋体;">加测试卡测试,发现主供电没有。接着查电压调整管和电源<span lang="EN-US">IC周围电路,发现电源IC的Vdd(12V)为0V。沿着Vdd往外找发现电路中1RO保险电阻断路,更换后故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">2. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一杂牌<span lang="EN-US">845黄色方型板不工作<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp; </span><b style="mso-bidi-font-weight: normal;">检修过程:</b>加电测试发现主供电异常,检查发现电源IC(HIP6301CB)有裂痕,更换后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">3.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">技嘉<span lang="EN-US">6BXC主板不亮,而且有时不能软开机,并被人维修过<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp; </span><b style="mso-bidi-font-weight: normal;">检修过程:</b>首先检查电源开关管没有击穿,将机箱电源的绿线(PS-ON)端与地短接以强制开机,电源仍是加不上电,测5V端及电源开关(PWR-SW)端电压正常,从而怀疑电源的某一路负载短路,造成电源保护,在与其它主板对比后,发现+12V组的阻值异常偏低,估计问题就产生于此,一翻检查后发现电源IC(HIP6004)的18脚(VCC),17脚(LGATE)对地在线电阻很小,更换HIP6004后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">4. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">-块<span lang="EN-US">4 Titan533型号主板,主板能正常点亮,且工作正常,故障为自动关机。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp; </span><b style="mso-bidi-font-weight: normal;">检修过程:</b>自动关机一般是由于监控电路保护或电压不稳保护所致,经仔细测量发现监控电路正常,当查到CPU主供电部分的Q63、 Q65开关管时,发现其中Q63的控制级接触不良,将其接上后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">5.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块<span lang="EN-US">AOPEN AX6BC PRO(建基)主板不亮<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 125%; mso-char-indent-count: -2.0; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;&nbsp;</span>检修过程:</b>当短接PWR-SW开关时,只看到测试卡指示灯闪一下,然后无法开机。估计可能是主板有局部短路,造成电源保护。进一步询问用户,用户反映带电安装风扇时曾无意中碰了某处,有火花出现,在对这块主板的电源部份检查中发现给CPU供电的场效应管FDB7030L,肖特基二极管1N5817击穿损坏,更换后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: -21pt; LINE-HEIGHT: 125%; mso-char-indent-count: -2.0; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">6.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一杂牌<span lang="EN-US">810主板,故障为工作不稳定(时亮时不亮)。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;</span>检修过程:</b>经查发现外核电压偏低(2.2V),正常为2.5V。沿着2.5V线路查找发现与之相连的一个三极管损坏,更换后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">7.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块<span lang="EN-US">SF694XVA主板不亮<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;</span>检修过程:</b>测CPU的各组供电,发现VCC-Core仅0.5V,明显异常。查电源开关管Q13、Q14正常,然后检查Q13、Q14的G极控制电压也正常,说明电源控制IC(HIP6021)正常。在进一步检查时,发现主供电滤波电容CE35(16V、1000UF)局部爆裂,更换后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">8. 故障现象:</span></b><span lang="EN-US" style="FONT-FAMILY: 宋体;">K7TPRO主板开机测试“FF” <p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp; </span><b style="mso-bidi-font-weight: normal;">检修过程:</b>加电测CPU核心供电为1.5V,正常应为1.65V左右,此主板用到电源IC型号为SC1155,排除电容漏电和场管短路后,更换SC1155故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">9. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块承启<span lang="EN-US">6VIA3主板不亮。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;</span>检修过程:</b>在目测中发现CPU插座附近的电容顶部爆裂,更换后加电电源仍不工作,查电源开关管Q14、Q15击穿,更换。加电试机,还是不亮。继续检查发现R144(2.7Ω)开路,电源控制IC U12(SC1164)的5脚VCC无12V,查与之相连的R160(10Ω)开路。一一更换上述元件,加电再试,R160再次烧坏。又检查了其他元件无异常后,我判断U12一定坏了,因为手头没有SC1164只好用SC1185代换,经查资料SC1164与SC1185只有第六脚定义不同,其他没有什么不一样,将SC1185的6脚悬空,焊在原SC1164位置上,并再次更换R160,最后加电测试故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">10. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">-技嘉<span lang="EN-US">QBI845D-533主板不亮<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;</span><span style="mso-spacerun: yes;">&nbsp;</span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;</span>检修过程:</b>经查供电在没插CPU时为1.0V,插上CPU后为0.68V,仔细观察发现其中一个电压调整管底座发黄,更换此管后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">11. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块杂牌<span lang="EN-US">815EP主板不亮<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;</span>维修过程:</b>插好测试卡,加电,发现RESET灯常亮,测PCI CLK信号没有,由此怀疑时钟电路有问题。测量时钟IC(U9)的供电电压发现其2.5V组仅有1.6V异常。查2.5V是由Q16(TL431)稳压而来的,这里Q16没问题,对电路分析发现2.5V是3.3V经D19降压后由Q16进行稳压的。测Q19降压似乎异常,在焊下来检查时,发现它已断为两半,更换后2.5V正常了,另外检查该板CPU供电电压时发现2.5V铜箔烧断,用线接好后,经测试主板完全修复。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">12. 故障现象:</span></b><span lang="EN-US" style="FONT-FAMILY: 宋体;"> P4VSD主板,故障为开机加电,测试卡灯闪一下,就断电。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;&nbsp;</span>维修过程:</b>此板主供电部分,用到的是KA7500B通过B772,D882进行电流放大后,控制场管,由快恢复二极管进行整流滤波供电的。当测Q1的G极对地阻值时,正常为500左右,而此板仅为0.58,判断为短路故障。因为是多路供电,其中任何一路Q1损坏,都会造成此种故障,逐个摘除,判断出损坏的场管,更换后故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">13. 故障现象:</span></b><span style="FONT-FAMILY: 宋体;">杂牌主板(黄色大板)<span lang="EN-US">Intel815芯片组不工作<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp;&nbsp;&nbsp; </span>维修过程:经查发现主供电在未加CPU前电压为5V,正常应为1.75V明显不正常。加CPU烧坏,查电压调整管和电源IC周围电路均正常,故判断为电源IC损坏。更换电源IC后,故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">14.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一紫色<span lang="EN-US">815ET/EPT主板数码卡显FF。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;"><span style="mso-spacerun: yes;">&nbsp; </span><b style="mso-bidi-font-weight: normal;"><span style="mso-spacerun: yes;">&nbsp;&nbsp;</span>维修过程:</b>复位灯常亮,查主供电输出为0V明显不正常,经查电压调整管和电源IC周围电路正常,故判断电源IC损坏,更换电源ICRT9231后,故障排除。<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 15.75pt; TEXT-INDENT: -15.75pt; LINE-HEIGHT: 125%; mso-char-indent-count: -1.5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">15.故障现象:</span></b><span lang="EN-US" style="FONT-FAMILY: 宋体;"> PCI1600-F主板不亮<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">首先进行目视检查,发现电源、控制<span lang="EN-US">IC U24(AIC 1569)表面有烧焦的痕迹,焊下U24,检查外围电路未见异常,更换U24后故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">16.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块<span lang="EN-US">EP-3VCM+(经694X芯片组)不工作<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; LINE-HEIGHT: 125%; mso-char-indent-count: 2.0; mso-char-indent-size: 10.55pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">通电检查发现<span lang="EN-US">Q2异常发烫,测量主供电发现异常,更换Q2之后,故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 125%; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">17.故障现象:</span></b><span lang="EN-US" style="FONT-FAMILY: 宋体;">M36330主板数码卡显FF <p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21.1pt; LINE-HEIGHT: 125%; mso-char-indent-count: 2.0; mso-char-indent-size: 10.55pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">查主供电异常,用手模电源<span lang="EN-US">IC(SC1155CSW)发烫,更换之后,故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 125%; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">18.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一杂牌<span lang="EN-US">845黄色方板,故障为运行大程序时死机。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">首先看看<span lang="EN-US">CPU供电滤波电容没有明显损坏,接着测各组时钟频率也正常。当查到CPU供电时,发现三组供电中的其中一组的控制器HIP6601ACB(和HIP6301CB搭配使用)很烫手,更换后故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">19.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块联想飞鹰<span lang="EN-US">370E主板故障为数码卡显FF<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">经查发现没有主供电,查电压调整管和电源<span lang="EN-US">IC电路均没有发现问题,最后检查到VID0-VID4电压发现电压偏低,沿着线路找VID0-VID4一端接电源IC,另一端接南桥。经分析怀疑集成在南桥内的监控芯片坏,换南桥故障解决。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 125%;"><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">20.故障现象:</span></b><span style="FONT-FAMILY: 宋体;">一块(<span lang="EN-US">SL-75KV+)462主板不工作<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><b style="mso-bidi-font-weight: normal;"><span style="FONT-FAMILY: 宋体;">维修过程:</span></b><span style="FONT-FAMILY: 宋体;">经查主供电异常,仔细查看电压调整管和电源<span lang="EN-US">IC周围电路无异常,故怀疑电源IC(HIP630ICB)损坏。更换后,故障排除。<p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 5.25pt; LINE-HEIGHT: 125%; mso-char-indent-count: .5; mso-char-indent-size: 10.5pt;"><span lang="EN-US" style="FONT-FAMILY: 宋体;">&nbsp;<p></p></span></p><p><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">21.故障现象:</span></b><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 10.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">可维<span lang="EN-US">815主板(红)数码卡显FF用3055更换后OK,此板无外核电压</span></span></p>
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