Can't get output image from VOUT0

Hi all

    We made a DM8168 board, the VOUT0 hardware is the same as DM8168 EVM.  The PHY we use a DVI not the HDMI, this is the only difference.  We use DM8168_DVRRDK_V03.00.00.00, run the demo Vdec_Vdis.  The demo run without any warnning message, but VOUT0 can't get image.  The monitor connect to the VOUT0 DVI display "no input singnal".  

    I want to know how i should do to fix the problem?

   Thank you!

   Eric!