140G-J6F3-D20电源
在无任何原理图状况下要对一块比较陌生的电路板进行维修，以往的所谓“经验”就难有作为，尽管硬件功底深厚的人对维修充满信心，但如果方法不当，工作起来照样事倍功半。那么，怎样做才能提高维修效呢？根据我公司进口设备维修中心统计出来的资料，应遵循以下几个步骤、按顺序有条不紊的进行。
方法一：先看后量
使用工具：万用表、放大镜
当手拿一块待修的电路板，良好的习惯首先是应对其进行目测，必要时还要借助放大镜，看什么呢？
主要看：
1、是否有断线；
2、分力元件如电阻、电解电容、电感、二极管、三极管等时候存在断开现象；
3、电路板上的印制板连接线是否存在断裂、粘连等；
4、是否有人修过？动过哪些元器件？是否存在虚焊、漏焊、插反等操作方面的失误；
在确定了被修无上述状况后，首先用万用表测量电路板电源和地之间的阻值，通常电路板的阻值都在70-80？以上，若阻值太小，才几个或十几个欧姆，说明电路板上有元器件被击穿或部分击穿，就必须采取措施将被击穿的元器件找出来。具体办法是给被修板供电，用手去摸电路板上各器件的
温度，烫手的讲师重点怀疑对象。若阻值正常，用万用表测量板上的阻、二极管、三极管、场效应管、拨段开关等分力元件，其目的就是首先要确保测量过的元件是正常的，我们的理由是，能用万用表解决的问题，就不要把它复杂化。
140G-J6F3-D20电源
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深圳市市委、市政府党组成员郑红波在大会上指出，深圳高度重视5G发展，坚持高强度投入、高标准建设，着力打造5G网络能效优质的建设标杆、5G技术先进的创新高地、5G应用融合的先行典范、5G产业链完备的世界级产业集聚区。接下来，深圳将继续以先行示范的责任与担当，进一步推动5G技术创新与产业融合双向赋能。
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