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看尚V50SD160主板不开机案例

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Post time: 2019-9-5 13:59:36
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机型:看尚V50SD160
版号:CV828H-Z
芯片方案:MSD6A828+单EMMC
故障现象:红灯亮不开机
分析与维修:通电指示灯亮红灯,按键遥控均不开机,打印信息如下:


打印信息一直循环重复,从打印信息看应该是引导运行不正常,先检查硬件的供电,待机5V,待机3,3正常,EMMC供电正常,内核供电在1.03到1.09有轻微跳变,DDR供电1.5V正常,断电测各供电对地正反向阻值也正常,拆下EMMC写入量产软件装回故障依旧,排除软件问题,重点检查引导运行条件。主芯片左边的两片DDR是运行引导的,重点先检查这两个DDR,不行再检查主芯片。这两片DDR地址线复用,数据线是各用各的,先拆掉MU1,按照DDR引脚功能图逐一测量对地阻值,当检查到DQ13的时候阻值无穷大,见下图

正常的阻值见下图:


顺着线路检查发现芯片下面的穿孔开路了,处理后阻值正常,见下图:


装上芯片,装回DDR后打印信息显示待机,重新升级后故障排除。见下图



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Post time: 2019-9-7 19:58:13
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Sir please use English language or translate option
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 Author| Post time: 2019-9-9 09:08:12
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Pk 2019-9-7 19:58
Sir please use English language or translate option

You can choose English when you read, or you can scan the QR code in this article and follow our WeChat official account where are a lot of English tutorials.
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