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BQ27Z746: 生产不良

Part Number: BQ27Z746

产线制作电池时发现保护板无法上电,请对以下问题进行分析及回复纠正预防措施

客户端投入4000PCS,不良2PCS,不良率:0.05%(IC不良:IC BQ27Z746YAHR DSBGA ROHS+REACH+无卤 编带 TI)

从X光机来看,不是焊接原因,想了解一下生产还应该注意什么