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No composite output with DM368 Leopard board and RidgeRun demo img

I am using the DM368 leopard board with ridgerun demo img. I have check the output and mode in

/sys/class/davinci_display/ch0/output, and check the mode is 'NTSC'

But looks no signal and output from the composite output.

The boot args I used is :

davinci_enc_mngr.ch0_output=COMPOSITE  davinci_enc_mngr.ch0_mode=NTSC davinci_display.cont2_bufsize=3145728  vpfe_capture.cont_bufoffset=3145728  vpfe_capture.cont_bufsize=6291456  console=ttyS0,115200n8  video=davincifb:vid0=off:vid1=off:osd1=off  dm365_imp.oper_mode=0  vpfe_capture.interface=1  mem=99M root=/dev/mmcblk0p2 rootdelay=2 rootfstype=ext3

Anyone knows what the problem could be?