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标题: this voice come out to Yin just like the grave sort cold [打印本页]

作者: mvlpaqwufy    时间: 2012-7-20 14:45     标题: this voice come out to Yin just like the grave sort cold

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   hurriedly surrender
  
   "put a person
作者: bjjdwx11    时间: 2012-7-27 16:28     标题: 美的空调维修 LED显示屏故障现象检查维修(-)

led显示屏故障现象检查维修(-)
1、单元板出现一条行长亮、暗亮、不亮。
检查维修:http://www.ledwxzx.com
    (1)目测单元板上的行管引出脚是否虚焊;如果是,将引脚焊好,格力空调维修
    (2)用万用表测量行管输出端是否和模块脚有通,如没通:用数据线连上,如有通,再测是否和地短路,如无,测电压是否正常(万用表测量方法:黑表笔接gnd、红表笔去测量各个管脚的电压);如是,则判断行输出端与所对应的模块管脚断路;如否,测量行管的输入端是否正常;如是,则行管坏、用同型号行管换之;如否,测量所对应hc138的输出端是否正常;如是,则判断hc138的输出端与行管的输入端断路;若否,则判断hc138h坏。
    (3)如果以上测量均属正常,则行管本身存在质量问题,用同型号行管换之。
  2、单元板出现一列长亮、暗亮、不亮。
检查维修:http://www.58fix.com
    (1)目测单元板上故障所对应的模块管脚及集成电路是否虚焊、短路、断路;如是,将引脚焊好。
    (2)用万用表测量hc595的输出端【hc595的输出引脚: 1、2、3、4、5、6、7、15共八列控制端;测量时应区分红、绿集成电路、顺序排列为:红、绿(r、g)电压是否正常;如是,则判断hc595输出端与模块输入端断路;如否,则判断hc595坏、用同型号的hc595集成电路换之(替换集成电路hc595时,注意电路引线别断开)。如hc595都正常那判断模块坏用同一型号的模块换上
    3、单元板出现八点行、列或单点不亮、长亮、暗亮及16点。
    检查维修:http://www.spsdgg.com
    (1)目测故障所对应的模块引脚及引线有无短路、虚焊、断路。
    (2)每小区(单元板共分上下两小区)的上下、左右模块之间共用连接线是否正常(将万用表置与相邻端,测量模块行输入端及各个控制输入端的引线连接),若是,则判断为模块坏,如否,可直接用细数据线代替接通即可消除。
    (3)可用万用表直接测量单个模块是否正常,如是,则判断为电路板与模块间的内部短路,如否则判断为模块坏,用同型号模块替换。
    4、单元板出现几行或整小区(单元板共分上下两小区)不亮、长亮、暗亮。
    检查维修:
    (1)目测所对应的行管、穿心电感、集成电路是否虚焊、短路、断路,如是,将短路处断开及虚焊、断路处重新焊好。
    (2)用万用表测量各个行管输出端电压是否正常(万用表测量方法:黑表笔接gnd、红表笔去测量各个管脚的电压);如是,则判断行输出端与所对应的模块管脚断路;如否,测量行管的输入端是否正常,万家乐热水器维修;如是,则行管坏、用同型号行管换之;如否,测量所对应hc138的输出端是否正常;如是,则判断hc138的输出端与行管的输入端断路;如否,则判断hc138坏。
    (3)用好的16p排线替换试一下,测量hc138地址输入端1、2、3引脚电压、选通端4、5(低电平有效)、6(高电平有效)及集成电路供电是否正常,如是,则判断为hc138坏,再则以(2)续查。(4)两小区之间的5v连接线是否断开,如是,可直接用同等电源线连通(一般现象为整小区不亮、暗亮)。http://www.tongchengfuwu.com
    (4)测量单元板输入端的行信号(16p可视为12组其中2、4,6、8脚分别为a、b、c、d,4组行信号)有无内部短路、断路及输入hc245后驱动是否正常,如是,则测量经hc245驱动输入hc138的信号是否正常,再以(2)续查,如否,则判断为hc245坏,用同型号的集成电路替换,小鸭洗衣机维修
作者: bjjdwx11    时间: 2012-7-27 16:30     标题: 奥克斯空调维修 高端网站,低价格,10年经验,专业诚信

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