1.测量 PCBA 板上 A21PIN-B21PIN 短接之间的 BGA,在降低 BGA 之后,测量 电路是否正常
2、测量 A21PIN&B21PIN 之间 BGA 器件的异常阻抗为305.9Ω,Ω、然后测量 A21PIN&B21PIN 之间 BGA 器件的正常阻抗为19.4Ω Ω
因此,我们得出 IC 异常的结论。
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