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求助,TPS65951+DM3730,关机后在1秒内按power key,无法开机

Other Parts Discussed in Thread: DM3730, TPS65951

TPS65951+DM3730,关机后在1秒内按power键,无法开机。测试无1.2v,1.8v电压输出。只有把电池拿掉再装回去,才能再次开机。

如果关机后等3秒再按power key,则每次都可以正常开机。

请问大概会是什么原因?应该怎样debug?