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AM5718电源管理芯片TPS6590377有一路电源输出不正常

Other Parts Discussed in Thread: AM5718

AM5718电源管理芯片TPS6590377引脚M7 N7引脚出来的电压太正常,三块板,二块是0.26V,另一块板是0.35V。如果拆掉R27,量得的电压是5V,即输入电压。其它路的电源都正常,请问是怎么回事。希望高手帮忙分析下。