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TMS320DM8167: 连锡

Part Number: TMS320DM8167

Dears,

此次贴片518颗,发现7颗芯片贴片后连锡。请问有没有什么改进意见。

检查发现有2盘(每盘44PCS)芯片BGA球体颜色有明显差异(图1),且戴手套触摸锡球有脱落的现象(图3),请帮解释下颜色不一样的原因,和锡球脱落的原因。