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DS90UB949 RX_5V与HPD的硬件接法

现在在调试一款屏,MCU->DS949->DS948->LCM,目前949 948 i2c已经通了,背光也点亮,但是没有图像输出,怀疑hdmi信号没有输入到949,读取949的寄存器5F为0,寄存器的50的第七位也为0,其中r158,r157没贴,也就是RX_5V没有接输入信号,HPD脚直接上啦到3.3v,请问这种设计有问题吗