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xuxiaoxia3:不良是跟着板子走还是CPU走试过对调吗 (2021-12-13 11:00)
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李培林:个人碰到过类似问题处理如下:1、检查单板组装后有无应力现象(PCB受力后时间长导致锡裂);2、回流炉工艺是否能满足需求(亲身体验过海思0.4间距的BGA在8温区生产不良率在7%左右,10温区生产无不良);3、锡膏使用成份,有些公司为了节省成本会用到0.5个银的锡膏,时间长后就 .. (2021-12-13 15:08)