牛屎芯片替换
https://www.instructables.com/Replacing-a-40-Pin-COB-With-a-44-Pin-QFP/搞牛屎芯片替换的玩家非常多,其中尤其以替换万用表的玩家,因为三位半常用的芯片是7106/7107,四位半常用的是7129/7135
这个网上的一位玩家替换效果:
https://img.anfulai.cn/dz/attachment/forum/202209/27/025535i6aa36pae1lriyd3.png
磨掉COB环氧树脂,使用这种封装的优势是成本低
https://img.anfulai.cn/dz/attachment/forum/202209/27/025710nifpp7saafsk72fc.png
https://img.anfulai.cn/dz/attachment/forum/202209/27/025728oltum660cngtud55.png
https://img.anfulai.cn/dz/attachment/forum/202209/27/025747egcogwh4pjkpk47k.png
https://img.anfulai.cn/dz/attachment/forum/202209/27/025814ud8co7cm2ffx8krc.png
https://img.anfulai.cn/dz/attachment/forum/202209/27/025838ap87z20bf948r588.png
换上新芯片的效果:
https://img.anfulai.cn/dz/attachment/forum/202209/27/025945gi4xotx1b2iosbro.png
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