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EV2400: 连接主机无法被识别,且芯片挂了

Part Number: EV2400
Other Parts Discussed in Thread: BQSTUDIO,

当EV2400  USB单接电脑,bqStudio 可以正常识别EV2400及版本号,且EV2400灯常亮。(正常)

当电池smbus接入EV2400,usb连接电脑,出现,EV2400灯不亮,且无法被bqStudio识别。(不正常)

此情况下,EV2400内部板子U9 U14 及周围芯片都存在发烫现象,且,usb_5v输出只有2.2v,3.3V输出也只有2.2v。EV2400无法正常工作

是什么原因导致此现象。主机端不能同时有上拉电阻吗?(PIC  SDA SCL上分别上拉4.7K电阻。有影响吗?)