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TPS23861 不供电

Other Parts Discussed in Thread: TPS23861

dear ti:

有个问题想请教一下,我现在有一个主板使用TPS23861,接上POE摄像头,摄像头不工作,测量POE波形发现是检测阶段不通过,一直处于检测阶段,波形如下:

POE摄像头是好的,我用没问题的主板验证过,可以正常工作,波形如下:

这个现象看起来像是没有检测到24.9KΩ的特征电阻或者是特征电容值不对,请问我该检查电路的哪一部分?电路图在附件,谢谢!7838.POE.pdf